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view libraries/mondelefant/mondelefant_native.c @ 84:079fb18d9b5f
Added tag v1.2.3 for changeset 6ab448e71d66
| author | jbe |
|---|---|
| date | Thu Jun 28 03:37:57 2012 +0200 (2012-06-28) |
| parents | 3d43a5cf17c1 |
| children | 8d7665e0d490 |
line source
1 #include <lua.h>
2 #include <lauxlib.h>
3 #include <libpq-fe.h>
4 #include <postgres.h>
5 #include <catalog/pg_type.h>
6 #include <stdint.h>
8 // NOTE: Comments with format "// <number>" denote the Lua stack position
10 // prefix for all Lua registry entries of this library:
11 #define MONDELEFANT_REGKEY "e449ba8d9a53d353_mondelefant_"
13 // registry key of module "mondelefant_native":
14 #define MONDELEFANT_MODULE_REGKEY (MONDELEFANT_REGKEY "module")
15 // registry key of meta-table for database connections:
16 #define MONDELEFANT_CONN_MT_REGKEY (MONDELEFANT_REGKEY "connection")
17 // registry key of table storing connection specific data:
18 #define MONDELEFANT_CONN_DATA_REGKEY (MONDELEFANT_REGKEY "connection_data")
19 // registry key of meta-table for database result lists and objects:
20 #define MONDELEFANT_RESULT_MT_REGKEY (MONDELEFANT_REGKEY "result")
21 // registry key of meta-table for database error objects:
22 #define MONDELEFANT_ERROROBJECT_MT_REGKEY (MONDELEFANT_REGKEY "errorobject")
23 // registry key of meta-table for models (named classes here):
24 #define MONDELEFANT_CLASS_MT_REGKEY (MONDELEFANT_REGKEY "class")
25 // registry key of default prototype for models/classes:
26 #define MONDELEFANT_CLASS_PROTO_REGKEY (MONDELEFANT_REGKEY "class_proto")
28 // C-structure for database connection userdata:
29 typedef struct {
30 PGconn *pgconn;
31 int server_encoding;
32 } mondelefant_conn_t;
33 #define MONDELEFANT_SERVER_ENCODING_ASCII 0
34 #define MONDELEFANT_SERVER_ENCODING_UTF8 1
36 // transform codepoint-position to byte-position for a given UTF-8 string:
37 static size_t utf8_position_to_byte(const char *str, size_t utf8pos) {
38 size_t bytepos;
39 for (bytepos = 0; utf8pos > 0; bytepos++) {
40 uint8_t c;
41 c = ((const uint8_t *)str)[bytepos];
42 if (!c) break;
43 if (c <= 0x7f || c >= 0xc0) utf8pos--;
44 }
45 return bytepos;
46 }
48 // PostgreSQL's OID for binary data type (bytea):
49 #define MONDELEFANT_POSTGRESQL_BINARY_OID ((Oid)17)
51 // mapping a PostgreSQL type given by its OID to a string identifier:
52 static const char *mondelefant_oid_to_typestr(Oid oid) {
53 switch (oid) {
54 case 16: return "bool";
55 case 17: return "bytea";
56 case 18: return "char";
57 case 19: return "name";
58 case 20: return "int8";
59 case 21: return "int2";
60 case 23: return "int4";
61 case 25: return "text";
62 case 26: return "oid";
63 case 27: return "tid";
64 case 28: return "xid";
65 case 29: return "cid";
66 case 600: return "point";
67 case 601: return "lseg";
68 case 602: return "path";
69 case 603: return "box";
70 case 604: return "polygon";
71 case 628: return "line";
72 case 700: return "float4";
73 case 701: return "float8";
74 case 705: return "unknown";
75 case 718: return "circle";
76 case 790: return "money";
77 case 829: return "macaddr";
78 case 869: return "inet";
79 case 650: return "cidr";
80 case 1042: return "bpchar";
81 case 1043: return "varchar";
82 case 1082: return "date";
83 case 1083: return "time";
84 case 1114: return "timestamp";
85 case 1184: return "timestamptz";
86 case 1186: return "interval";
87 case 1266: return "timetz";
88 case 1560: return "bit";
89 case 1562: return "varbit";
90 case 1700: return "numeric";
91 default: return NULL;
92 }
93 }
95 // This library maps PostgreSQL's error codes to CamelCase string
96 // identifiers, which consist of CamelCase identifiers and are seperated
97 // by dots (".") (no leading or trailing dots).
98 // There are additional error identifiers which do not have a corresponding
99 // PostgreSQL error associated with it.
101 // matching start of local variable 'pgcode' against string 'incode',
102 // returning string 'outcode' on match:
103 #define mondelefant_errcode_item(incode, outcode) \
104 if (!strncmp(pgcode, (incode), strlen(incode))) return outcode; else
106 // additional error identifiers without corresponding PostgreSQL error:
107 #define MONDELEFANT_ERRCODE_UNKNOWN "unknown"
108 #define MONDELEFANT_ERRCODE_CONNECTION "ConnectionException"
109 #define MONDELEFANT_ERRCODE_RESULTCOUNT_LOW "WrongResultSetCount.ResultSetMissing"
110 #define MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH "WrongResultSetCount.TooManyResults"
111 #define MONDELEFANT_ERRCODE_QUERY1_NO_ROWS "NoData.OneRowExpected"
112 #define MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS "CardinalityViolation.OneRowExpected"
114 // mapping PostgreSQL error code to error code as returned by this library:
115 static const char *mondelefant_translate_errcode(const char *pgcode) {
116 if (!pgcode) abort(); // should not happen
117 mondelefant_errcode_item("02", "NoData")
118 mondelefant_errcode_item("03", "SqlStatementNotYetComplete")
119 mondelefant_errcode_item("08", "ConnectionException")
120 mondelefant_errcode_item("09", "TriggeredActionException")
121 mondelefant_errcode_item("0A", "FeatureNotSupported")
122 mondelefant_errcode_item("0B", "InvalidTransactionInitiation")
123 mondelefant_errcode_item("0F", "LocatorException")
124 mondelefant_errcode_item("0L", "InvalidGrantor")
125 mondelefant_errcode_item("0P", "InvalidRoleSpecification")
126 mondelefant_errcode_item("21", "CardinalityViolation")
127 mondelefant_errcode_item("22", "DataException")
128 mondelefant_errcode_item("23001", "IntegrityConstraintViolation.RestrictViolation")
129 mondelefant_errcode_item("23502", "IntegrityConstraintViolation.NotNullViolation")
130 mondelefant_errcode_item("23503", "IntegrityConstraintViolation.ForeignKeyViolation")
131 mondelefant_errcode_item("23505", "IntegrityConstraintViolation.UniqueViolation")
132 mondelefant_errcode_item("23514", "IntegrityConstraintViolation.CheckViolation")
133 mondelefant_errcode_item("23", "IntegrityConstraintViolation")
134 mondelefant_errcode_item("24", "InvalidCursorState")
135 mondelefant_errcode_item("25", "InvalidTransactionState")
136 mondelefant_errcode_item("26", "InvalidSqlStatementName")
137 mondelefant_errcode_item("27", "TriggeredDataChangeViolation")
138 mondelefant_errcode_item("28", "InvalidAuthorizationSpecification")
139 mondelefant_errcode_item("2B", "DependentPrivilegeDescriptorsStillExist")
140 mondelefant_errcode_item("2D", "InvalidTransactionTermination")
141 mondelefant_errcode_item("2F", "SqlRoutineException")
142 mondelefant_errcode_item("34", "InvalidCursorName")
143 mondelefant_errcode_item("38", "ExternalRoutineException")
144 mondelefant_errcode_item("39", "ExternalRoutineInvocationException")
145 mondelefant_errcode_item("3B", "SavepointException")
146 mondelefant_errcode_item("3D", "InvalidCatalogName")
147 mondelefant_errcode_item("3F", "InvalidSchemaName")
148 mondelefant_errcode_item("40", "TransactionRollback")
149 mondelefant_errcode_item("42", "SyntaxErrorOrAccessRuleViolation")
150 mondelefant_errcode_item("44", "WithCheckOptionViolation")
151 mondelefant_errcode_item("53", "InsufficientResources")
152 mondelefant_errcode_item("54", "ProgramLimitExceeded")
153 mondelefant_errcode_item("55", "ObjectNotInPrerequisiteState")
154 mondelefant_errcode_item("57", "OperatorIntervention")
155 mondelefant_errcode_item("58", "SystemError")
156 mondelefant_errcode_item("F0", "ConfigurationFileError")
157 mondelefant_errcode_item("P0", "PlpgsqlError")
158 mondelefant_errcode_item("XX", "InternalError")
159 return "unknown";
160 }
162 // C-function, checking if a given error code (as defined by this library)
163 // is belonging to a certain class of errors (strings are equal or error
164 // code begins with error class followed by a dot):
165 static int mondelefant_check_error_class(
166 const char *errcode, const char *errclass
167 ) {
168 size_t i = 0;
169 while (1) {
170 if (errclass[i] == 0) {
171 if (errcode[i] == 0 || errcode[i] == '.') return 1;
172 else return 0;
173 }
174 if (errcode[i] != errclass[i]) return 0;
175 i++;
176 }
177 }
179 // pushing first line of a string on Lua's stack (without trailing CR/LF):
180 static void mondelefant_push_first_line(lua_State *L, const char *str) {
181 char *str2;
182 size_t i = 0;
183 if (!str) abort(); // should not happen
184 str2 = strdup(str);
185 while (1) {
186 char c = str2[i];
187 if (c == '\n' || c == '\r' || c == 0) { str2[i] = 0; break; }
188 i++;
189 };
190 lua_pushstring(L, str2);
191 free(str2);
192 }
194 // "connect" function of library, which establishes a database connection
195 // and returns a database connection handle:
196 static int mondelefant_connect(lua_State *L) {
197 luaL_Buffer buf; // Lua string buffer to create 'conninfo' (see below)
198 const char *conninfo; // string for PQconnectdb function
199 PGconn *pgconn; // PGconn object as returned by PQconnectdb function
200 mondelefant_conn_t *conn; // C-structure for userdata
201 // if engine is anything but "postgresql", then raise error:
202 lua_settop(L, 1);
203 lua_getfield(L, 1, "engine"); // 2
204 if (!lua_toboolean(L, 2)) {
205 return luaL_error(L, "No database engine selected.");
206 }
207 lua_pushliteral(L, "postgresql"); // 3
208 if (!lua_rawequal(L, 2, 3)) {
209 return luaL_error(L,
210 "Only database engine 'postgresql' is supported."
211 );
212 }
213 // copy conninfo string for PQconnectdb function from argument table to
214 // stack position 2:
215 lua_settop(L, 1);
216 lua_getfield(L, 1, "conninfo"); // 2
217 // if no conninfo string was found, then assemble one from the named
218 // options except "engine" option:
219 if (!lua_toboolean(L, 2)) {
220 lua_settop(L, 1);
221 lua_pushnil(L); // slot for key at stack position 2
222 lua_pushnil(L); // slot for value at stack position 3
223 luaL_buffinit(L, &buf);
224 {
225 int need_seperator = 0;
226 while (lua_pushvalue(L, 2), lua_next(L, 1)) {
227 lua_replace(L, 3);
228 lua_replace(L, 2);
229 // NOTE: numbers will be converted to strings automatically here,
230 // but perhaps this will change in future versions of lua
231 luaL_argcheck(L,
232 lua_isstring(L, 2) && lua_isstring(L, 3), 1, "non-string contained"
233 );
234 lua_pushvalue(L, 2);
235 lua_pushliteral(L, "engine");
236 if (!lua_rawequal(L, -2, -1)) {
237 const char *value;
238 size_t value_len;
239 size_t value_pos = 0;
240 lua_pop(L, 1);
241 if (need_seperator) luaL_addchar(&buf, ' ');
242 luaL_addvalue(&buf);
243 luaL_addchar(&buf, '=');
244 luaL_addchar(&buf, '\'');
245 value = lua_tolstring(L, 3, &value_len);
246 do {
247 char c;
248 c = value[value_pos++];
249 if (c == '\'') luaL_addchar(&buf, '\\');
250 luaL_addchar(&buf, c);
251 } while (value_pos < value_len);
252 luaL_addchar(&buf, '\'');
253 need_seperator = 1;
254 } else {
255 lua_pop(L, 1);
256 }
257 }
258 }
259 luaL_pushresult(&buf);
260 lua_replace(L, 2);
261 lua_settop(L, 2);
262 }
263 // use conninfo string on stack position 2:
264 conninfo = lua_tostring(L, 2);
265 // call PQconnectdb function of libpq:
266 pgconn = PQconnectdb(conninfo);
267 // throw errors, if neccessary:
268 if (!pgconn) {
269 return luaL_error(L,
270 "Error in libpq while creating 'PGconn' structure."
271 );
272 }
273 if (PQstatus(pgconn) != CONNECTION_OK) {
274 const char *errmsg;
275 lua_pushnil(L);
276 errmsg = PQerrorMessage(pgconn);
277 if (errmsg) {
278 mondelefant_push_first_line(L, errmsg);
279 } else {
280 lua_pushliteral(L,
281 "Error while connecting to database, but no error message given."
282 );
283 }
284 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
285 PQfinish(pgconn);
286 return 3;
287 }
288 // create userdata:
289 lua_settop(L, 0);
290 conn = lua_newuserdata(L, sizeof(*conn)); // 1
291 // set 'pgconn' in C-struct of userdata:
292 conn->pgconn = pgconn;
293 // set 'server_encoding' in C-struct of userdata:
294 {
295 const char *charset;
296 charset = PQparameterStatus(pgconn, "server_encoding");
297 if (charset && !strcmp(charset, "UTF8")) {
298 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_UTF8;
299 } else {
300 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_ASCII;
301 }
302 }
303 // set meta-table of userdata:
304 luaL_getmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
305 lua_setmetatable(L, 1);
306 // create entry in table storing connection specific data and associate
307 // created userdata with it:
308 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CONN_DATA_REGKEY); // 2
309 lua_pushvalue(L, 1); // 3
310 lua_newtable(L); // 4
311 lua_settable(L, 2);
312 lua_settop(L, 1);
313 // store key "engine" with value "postgresql" as connection specific data:
314 lua_pushliteral(L, "postgresql");
315 lua_setfield(L, 1, "engine");
316 // return userdata:
317 return 1;
318 }
320 // returns pointer to libpq handle 'pgconn' of userdata at given index
321 // (or throws error, if database connection has been closed):
322 static mondelefant_conn_t *mondelefant_get_conn(lua_State *L, int index) {
323 mondelefant_conn_t *conn;
324 conn = luaL_checkudata(L, index, MONDELEFANT_CONN_MT_REGKEY);
325 if (!conn->pgconn) {
326 luaL_error(L, "PostgreSQL connection has been closed.");
327 return NULL;
328 }
329 return conn;
330 }
332 // meta-method "__index" of database handles (userdata):
333 static int mondelefant_conn_index(lua_State *L) {
334 // try table for connection specific data:
335 lua_settop(L, 2);
336 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CONN_DATA_REGKEY); // 3
337 lua_pushvalue(L, 1); // 4
338 lua_gettable(L, 3); // 4
339 lua_remove(L, 3); // connection specific data-table at stack position 3
340 lua_pushvalue(L, 2); // 4
341 lua_gettable(L, 3); // 4
342 if (!lua_isnil(L, 4)) return 1;
343 // try to use prototype stored in connection specific data:
344 lua_settop(L, 3);
345 lua_getfield(L, 3, "prototype"); // 4
346 if (lua_toboolean(L, 4)) {
347 lua_pushvalue(L, 2); // 5
348 lua_gettable(L, 4); // 5
349 if (!lua_isnil(L, 5)) return 1;
350 }
351 // try to use "postgresql_connection_prototype" of library:
352 lua_settop(L, 2);
353 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY); // 3
354 lua_getfield(L, 3, "postgresql_connection_prototype"); // 4
355 if (lua_toboolean(L, 4)) {
356 lua_pushvalue(L, 2); // 5
357 lua_gettable(L, 4); // 5
358 if (!lua_isnil(L, 5)) return 1;
359 }
360 // try to use "connection_prototype" of library:
361 lua_settop(L, 3);
362 lua_getfield(L, 3, "connection_prototype"); // 4
363 if (lua_toboolean(L, 4)) {
364 lua_pushvalue(L, 2); // 5
365 lua_gettable(L, 4); // 5
366 if (!lua_isnil(L, 5)) return 1;
367 }
368 // give up and return nothing:
369 return 0;
370 }
372 // meta-method "__newindex" of database handles (userdata):
373 static int mondelefant_conn_newindex(lua_State *L) {
374 // store key-value pair in table for connection specific data:
375 lua_settop(L, 3);
376 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CONN_DATA_REGKEY); // 4
377 lua_pushvalue(L, 1); // 5
378 lua_gettable(L, 4); // 5
379 lua_remove(L, 4); // connection specific data-table at stack position 4
380 lua_pushvalue(L, 2);
381 lua_pushvalue(L, 3);
382 lua_settable(L, 4);
383 // return nothing:
384 return 0;
385 }
387 // meta-method "__gc" of database handles:
388 static int mondelefant_conn_free(lua_State *L) {
389 mondelefant_conn_t *conn;
390 conn = luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
391 if (conn->pgconn) PQfinish(conn->pgconn);
392 conn->pgconn = NULL;
393 return 0;
394 }
396 // method "close" of database handles:
397 static int mondelefant_conn_close(lua_State *L) {
398 mondelefant_conn_t *conn;
399 lua_settop(L, 1);
400 conn = mondelefant_get_conn(L, 1);
401 PQfinish(conn->pgconn);
402 conn->pgconn = NULL;
403 return 0;
404 }
406 // method "is_okay" of database handles:
407 static int mondelefant_conn_is_ok(lua_State *L) {
408 mondelefant_conn_t *conn;
409 lua_settop(L, 1);
410 conn = mondelefant_get_conn(L, 1);
411 lua_pushboolean(L, PQstatus(conn->pgconn) == CONNECTION_OK);
412 return 1;
413 }
415 // method "get_transaction_status" of database handles:
416 static int mondelefant_conn_get_transaction_status(lua_State *L) {
417 mondelefant_conn_t *conn;
418 lua_settop(L, 1);
419 conn = mondelefant_get_conn(L, 1);
420 switch (PQtransactionStatus(conn->pgconn)) {
421 case PQTRANS_IDLE:
422 lua_pushliteral(L, "idle");
423 break;
424 case PQTRANS_ACTIVE:
425 lua_pushliteral(L, "active");
426 break;
427 case PQTRANS_INTRANS:
428 lua_pushliteral(L, "intrans");
429 break;
430 case PQTRANS_INERROR:
431 lua_pushliteral(L, "inerror");
432 break;
433 default:
434 lua_pushliteral(L, "unknown");
435 }
436 return 1;
437 }
439 // method "create_list" of database handles:
440 static int mondelefant_conn_create_list(lua_State *L) {
441 // ensure that first argument is a database connection:
442 lua_settop(L, 2);
443 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
444 // if no second argument is given, use an empty table:
445 if (!lua_toboolean(L, 2)) {
446 lua_newtable(L);
447 lua_replace(L, 2); // new result at stack position 2
448 }
449 // set meta-table for database result lists/objects:
450 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 3
451 lua_setmetatable(L, 2);
452 // set "_connection" attribute to self:
453 lua_pushvalue(L, 1); // 3
454 lua_setfield(L, 2, "_connection");
455 // set "_type" attribute to string "list":
456 lua_pushliteral(L, "list"); // 3
457 lua_setfield(L, 2, "_type");
458 // return created database result list:
459 return 1;
460 }
462 // method "create_object" of database handles:
463 static int mondelefant_conn_create_object(lua_State *L) {
464 // ensure that first argument is a database connection:
465 lua_settop(L, 2);
466 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
467 // if no second argument is given, use an empty table:
468 if (!lua_toboolean(L, 2)) {
469 lua_newtable(L);
470 lua_replace(L, 2); // new result at stack position 2
471 }
472 // set meta-table for database result lists/objects:
473 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 3
474 lua_setmetatable(L, 2);
475 // set "_connection" attribute to self:
476 lua_pushvalue(L, 1); // 3
477 lua_setfield(L, 2, "_connection");
478 // set "_type" attribute to string "object":
479 lua_pushliteral(L, "object"); // 3
480 lua_setfield(L, 2, "_type"); // "object" or "list"
481 // create empty tables for "_data", "_dirty" and "_ref" attributes:
482 lua_newtable(L); // 3
483 lua_setfield(L, 2, "_data");
484 lua_newtable(L); // 3
485 lua_setfield(L, 2, "_dirty");
486 lua_newtable(L); // 3
487 lua_setfield(L, 2, "_ref"); // nil=no info, false=nil, else table
488 // return created database result object:
489 return 1;
490 }
492 // method "quote_string" of database handles:
493 static int mondelefant_conn_quote_string(lua_State *L) {
494 mondelefant_conn_t *conn;
495 const char *input;
496 size_t input_len;
497 char *output;
498 size_t output_len;
499 // get 'conn' attribute of C-struct of database connection:
500 lua_settop(L, 2);
501 conn = mondelefant_get_conn(L, 1);
502 // get second argument, which must be a string:
503 input = luaL_checklstring(L, 2, &input_len);
504 // throw error, if string is too long:
505 if (input_len > (SIZE_MAX / sizeof(char) - 3) / 2) {
506 return luaL_error(L, "String to be escaped is too long.");
507 }
508 // allocate memory for quoted string:
509 output = malloc((2 * input_len + 3) * sizeof(char));
510 if (!output) {
511 return luaL_error(L, "Could not allocate memory for string quoting.");
512 }
513 // do escaping by calling PQescapeStringConn and enclosing result with
514 // single quotes:
515 output[0] = '\'';
516 output_len = PQescapeStringConn(
517 conn->pgconn, output + 1, input, input_len, NULL
518 );
519 output[output_len + 1] = '\'';
520 output[output_len + 2] = 0;
521 // create Lua string:
522 lua_pushlstring(L, output, output_len + 2);
523 // free allocated memory:
524 free(output);
525 // return Lua string:
526 return 1;
527 }
529 // method "quote_binary" of database handles:
530 static int mondelefant_conn_quote_binary(lua_State *L) {
531 mondelefant_conn_t *conn;
532 const char *input;
533 size_t input_len;
534 char *output;
535 size_t output_len;
536 luaL_Buffer buf;
537 // get 'conn' attribute of C-struct of database connection:
538 lua_settop(L, 2);
539 conn = mondelefant_get_conn(L, 1);
540 // get second argument, which must be a string:
541 input = luaL_checklstring(L, 2, &input_len);
542 // call PQescapeByteaConn, which allocates memory itself:
543 output = (char *)PQescapeByteaConn(
544 conn->pgconn, (const unsigned char *)input, input_len, &output_len
545 );
546 // if PQescapeByteaConn returned NULL, then throw error:
547 if (!output) {
548 return luaL_error(L, "Could not allocate memory for binary quoting.");
549 }
550 // create Lua string enclosed by single quotes:
551 luaL_buffinit(L, &buf);
552 luaL_addchar(&buf, '\'');
553 luaL_addlstring(&buf, output, output_len - 1);
554 luaL_addchar(&buf, '\'');
555 luaL_pushresult(&buf);
556 // free memory allocated by PQescapeByteaConn:
557 PQfreemem(output);
558 // return Lua string:
559 return 1;
560 }
562 // method "assemble_command" of database handles:
563 static int mondelefant_conn_assemble_command(lua_State *L) {
564 mondelefant_conn_t *conn;
565 int paramidx = 2;
566 const char *template;
567 size_t template_pos = 0;
568 luaL_Buffer buf;
569 // get 'conn' attribute of C-struct of database connection:
570 lua_settop(L, 2);
571 conn = mondelefant_get_conn(L, 1);
572 // if second argument is a string, return this string:
573 if (lua_isstring(L, 2)) {
574 lua_tostring(L, 2);
575 return 1;
576 }
577 // if second argument has __tostring meta-method,
578 // then use this method and return its result:
579 if (luaL_callmeta(L, 2, "__tostring")) return 1;
580 // otherwise, require that second argument is a table:
581 luaL_checktype(L, 2, LUA_TTABLE);
582 // get first element of table, which must be a string:
583 lua_rawgeti(L, 2, 1); // 3
584 luaL_argcheck(L,
585 lua_isstring(L, 3),
586 2,
587 "First entry of SQL command structure is not a string."
588 );
589 template = lua_tostring(L, 3);
590 // get value of "input_converter" attribute of database connection:
591 lua_pushliteral(L, "input_converter"); // 4
592 lua_gettable(L, 1); // input_converter at stack position 4
593 // reserve space on Lua stack:
594 lua_pushnil(L); // free space at stack position 5
595 lua_pushnil(L); // free space at stack position 6
596 // initialize Lua buffer for result string:
597 luaL_buffinit(L, &buf);
598 // fill buffer in loop:
599 while (1) {
600 // variable declaration:
601 char c;
602 // get next character:
603 c = template[template_pos++];
604 // break, when character is NULL byte:
605 if (!c) break;
606 // question-mark and dollar-sign are special characters:
607 if (c == '?' || c == '$') { // special character found
608 // check, if same character follows:
609 if (template[template_pos] == c) { // special character is escaped
610 // consume two characters of input and add one character to buffer:
611 template_pos++;
612 luaL_addchar(&buf, c);
613 } else { // special character is not escaped
614 luaL_Buffer keybuf;
615 int subcmd;
616 // set 'subcmd' = true, if special character was a dollar-sign,
617 // set 'subcmd' = false, if special character was a question-mark:
618 subcmd = (c == '$');
619 // read any number of alpha numeric chars or underscores
620 // and store them on Lua stack:
621 luaL_buffinit(L, &keybuf);
622 while (1) {
623 c = template[template_pos];
624 if (
625 (c < 'A' || c > 'Z') &&
626 (c < 'a' || c > 'z') &&
627 (c < '0' || c > '9') &&
628 (c != '_')
629 ) break;
630 luaL_addchar(&keybuf, c);
631 template_pos++;
632 }
633 luaL_pushresult(&keybuf);
634 // check, if any characters matched:
635 #if LUA_VERSION_NUM >= 502
636 if (lua_rawlen(L, -1)) {
637 #else
638 if (lua_objlen(L, -1)) {
639 #endif
640 // if any alpha numeric chars or underscores were found,
641 // push them on stack as a Lua string and use them to lookup
642 // value from second argument:
643 lua_pushvalue(L, -1); // save key on stack
644 lua_gettable(L, 2); // fetch value (raw-value)
645 } else {
646 // otherwise push nil and use numeric lookup based on 'paramidx':
647 lua_pop(L, 1);
648 lua_pushnil(L); // put nil on key position
649 lua_rawgeti(L, 2, paramidx++); // fetch value (raw-value)
650 }
651 // Lua stack contains: ..., <buffer>, key, raw-value
652 // branch according to type of special character ("?" or "$"):
653 if (subcmd) { // dollar-sign
654 size_t i;
655 size_t count;
656 // store fetched value (which is supposed to be sub-structure)
657 // on Lua stack position 5 and drop key:
658 lua_replace(L, 5);
659 lua_pop(L, 1);
660 // Lua stack contains: ..., <buffer>
661 // check, if fetched value is really a sub-structure:
662 luaL_argcheck(L,
663 !lua_isnil(L, 5),
664 2,
665 "SQL sub-structure not found."
666 );
667 luaL_argcheck(L,
668 lua_type(L, 5) == LUA_TTABLE,
669 2,
670 "SQL sub-structure must be a table."
671 );
672 // Lua stack contains: ..., <buffer>
673 // get value of "sep" attribute of sub-structure,
674 // and place it on Lua stack position 6:
675 lua_getfield(L, 5, "sep");
676 lua_replace(L, 6);
677 // if seperator is nil, then use ", " as default,
678 // if seperator is neither nil nor a string, then throw error:
679 if (lua_isnil(L, 6)) {
680 lua_pushstring(L, ", ");
681 lua_replace(L, 6);
682 } else {
683 luaL_argcheck(L,
684 lua_isstring(L, 6),
685 2,
686 "Seperator of SQL sub-structure has to be a string."
687 );
688 }
689 // iterate over items of sub-structure:
690 #if LUA_VERSION_NUM >= 502
691 count = lua_rawlen(L, 5);
692 #else
693 count = lua_objlen(L, 5);
694 #endif
695 for (i = 0; i < count; i++) {
696 // add seperator, unless this is the first run:
697 if (i) {
698 lua_pushvalue(L, 6);
699 luaL_addvalue(&buf);
700 }
701 // recursivly apply assemble function and add results to buffer:
702 lua_pushcfunction(L, mondelefant_conn_assemble_command);
703 lua_pushvalue(L, 1);
704 lua_rawgeti(L, 5, i+1);
705 lua_call(L, 2, 1);
706 luaL_addvalue(&buf);
707 }
708 } else { // question-mark
709 if (lua_toboolean(L, 4)) {
710 // call input_converter with connection handle, raw-value and
711 // an info-table which contains a "field_name" entry with the
712 // used key:
713 lua_pushvalue(L, 4);
714 lua_pushvalue(L, 1);
715 lua_pushvalue(L, -3);
716 lua_newtable(L);
717 lua_pushvalue(L, -6);
718 lua_setfield(L, -2, "field_name");
719 lua_call(L, 3, 1);
720 // Lua stack contains: ..., <buffer>, key, raw-value, final-value
721 // remove key and raw-value:
722 lua_remove(L, -2);
723 lua_remove(L, -2);
724 // Lua stack contains: ..., <buffer>, final-value
725 // throw error, if final-value is not a string:
726 if (!lua_isstring(L, -1)) {
727 return luaL_error(L, "input_converter returned non-string.");
728 }
729 } else {
730 // remove key from stack:
731 lua_remove(L, -2);
732 // Lua stack contains: ..., <buffer>, raw-value
733 // branch according to type of value:
734 if (lua_isnil(L, -1)) { // value is nil
735 // push string "NULL" to stack:
736 lua_pushliteral(L, "NULL");
737 } else if (lua_type(L, -1) == LUA_TBOOLEAN) { // value is boolean
738 // push strings "TRUE" or "FALSE" to stack:
739 lua_pushstring(L, lua_toboolean(L, -1) ? "TRUE" : "FALSE");
740 } else if (lua_isstring(L, -1)) { // value is string or number
741 // NOTE: In this version of lua a number will be converted
742 // push output of "quote_string" method of database
743 // connection to stack:
744 lua_tostring(L, -1);
745 lua_pushcfunction(L, mondelefant_conn_quote_string);
746 lua_pushvalue(L, 1);
747 lua_pushvalue(L, -3);
748 lua_call(L, 2, 1);
749 } else { // value is of other type
750 // throw error:
751 return luaL_error(L,
752 "Unable to convert SQL value due to unknown type "
753 "or missing input_converter."
754 );
755 }
756 // Lua stack contains: ..., <buffer>, raw-value, final-value
757 // remove raw-value:
758 lua_remove(L, -2);
759 // Lua stack contains: ..., <buffer>, final-value
760 }
761 // append final-value to buffer:
762 luaL_addvalue(&buf);
763 }
764 }
765 } else { // character is not special
766 // just copy character:
767 luaL_addchar(&buf, c);
768 }
769 }
770 // return string in buffer:
771 luaL_pushresult(&buf);
772 return 1;
773 }
775 // max number of SQL statements executed by one "query" method call:
776 #define MONDELEFANT_MAX_COMMAND_COUNT 64
777 // max number of columns in a database result:
778 #define MONDELEFANT_MAX_COLUMN_COUNT 1024
779 // enum values for 'modes' array in C-function below:
780 #define MONDELEFANT_QUERY_MODE_LIST 1
781 #define MONDELEFANT_QUERY_MODE_OBJECT 2
782 #define MONDELEFANT_QUERY_MODE_OPT_OBJECT 3
784 // method "try_query" of database handles:
785 static int mondelefant_conn_try_query(lua_State *L) {
786 mondelefant_conn_t *conn;
787 int command_count;
788 int command_idx;
789 int modes[MONDELEFANT_MAX_COMMAND_COUNT];
790 luaL_Buffer buf;
791 int sent_success;
792 PGresult *res;
793 int rows, cols, row, col;
794 // get 'conn' attribute of C-struct of database connection:
795 conn = mondelefant_get_conn(L, 1);
796 // calculate number of commands (2 arguments for one command):
797 command_count = lua_gettop(L) / 2;
798 // push nil on stack, which is needed, if last mode was ommitted:
799 lua_pushnil(L);
800 // throw error, if number of commands is too high:
801 if (command_count > MONDELEFANT_MAX_COMMAND_COUNT) {
802 return luaL_error(L, "Exceeded maximum command count in one query.");
803 }
804 // create SQL string, store query modes and push SQL string on stack:
805 luaL_buffinit(L, &buf);
806 for (command_idx = 0; command_idx < command_count; command_idx++) {
807 int mode;
808 int mode_idx; // stack index of mode string
809 if (command_idx) luaL_addchar(&buf, ' ');
810 lua_pushcfunction(L, mondelefant_conn_assemble_command);
811 lua_pushvalue(L, 1);
812 lua_pushvalue(L, 2 + 2 * command_idx);
813 lua_call(L, 2, 1);
814 luaL_addvalue(&buf);
815 luaL_addchar(&buf, ';');
816 mode_idx = 3 + 2 * command_idx;
817 if (lua_isnil(L, mode_idx)) {
818 mode = MONDELEFANT_QUERY_MODE_LIST;
819 } else {
820 const char *modestr;
821 modestr = luaL_checkstring(L, mode_idx);
822 if (!strcmp(modestr, "list")) {
823 mode = MONDELEFANT_QUERY_MODE_LIST;
824 } else if (!strcmp(modestr, "object")) {
825 mode = MONDELEFANT_QUERY_MODE_OBJECT;
826 } else if (!strcmp(modestr, "opt_object")) {
827 mode = MONDELEFANT_QUERY_MODE_OPT_OBJECT;
828 } else {
829 return luaL_error(L, "Unknown query mode specified.");
830 }
831 }
832 modes[command_idx] = mode;
833 }
834 luaL_pushresult(&buf); // stack position unknown
835 lua_replace(L, 2); // SQL command string to stack position 2
836 // call sql_tracer, if set:
837 lua_settop(L, 2);
838 lua_getfield(L, 1, "sql_tracer"); // tracer at stack position 3
839 if (lua_toboolean(L, 3)) {
840 lua_pushvalue(L, 1); // 4
841 lua_pushvalue(L, 2); // 5
842 lua_call(L, 2, 1); // trace callback at stack position 3
843 }
844 // NOTE: If no tracer was found, then nil or false is stored at stack
845 // position 3.
846 // call PQsendQuery function and store result in 'sent_success' variable:
847 sent_success = PQsendQuery(conn->pgconn, lua_tostring(L, 2));
848 // create preliminary result table:
849 lua_newtable(L); // results in table at stack position 4
850 // iterate over results using function PQgetResult to fill result table:
851 for (command_idx = 0; ; command_idx++) {
852 int mode;
853 char binary[MONDELEFANT_MAX_COLUMN_COUNT];
854 ExecStatusType pgstatus;
855 // fetch mode which was given for the command:
856 mode = modes[command_idx];
857 // if PQsendQuery call was successful, then fetch result data:
858 if (sent_success) {
859 // NOTE: PQgetResult called one extra time. Break only, if all
860 // queries have been processed and PQgetResult returned NULL.
861 res = PQgetResult(conn->pgconn);
862 if (command_idx >= command_count && !res) break;
863 if (res) {
864 pgstatus = PQresultStatus(res);
865 rows = PQntuples(res);
866 cols = PQnfields(res);
867 }
868 }
869 // handle errors:
870 if (
871 !sent_success || command_idx >= command_count || !res ||
872 (pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK) ||
873 (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) ||
874 (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST)
875 ) {
876 const char *command;
877 command = lua_tostring(L, 2);
878 lua_newtable(L); // 5
879 lua_getfield(L,
880 LUA_REGISTRYINDEX,
881 MONDELEFANT_ERROROBJECT_MT_REGKEY
882 );
883 lua_setmetatable(L, 5);
884 lua_pushvalue(L, 1);
885 lua_setfield(L, 5, "connection");
886 lua_pushinteger(L, command_idx + 1);
887 lua_setfield(L, 5, "command_number");
888 lua_pushvalue(L, 2);
889 lua_setfield(L, 5, "sql_command");
890 if (!res) {
891 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_LOW);
892 lua_setfield(L, 5, "code");
893 lua_pushliteral(L, "Received too few database result sets.");
894 lua_setfield(L, 5, "message");
895 } else if (command_idx >= command_count) {
896 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH);
897 lua_setfield(L, 5, "code");
898 lua_pushliteral(L, "Received too many database result sets.");
899 lua_setfield(L, 5, "message");
900 } else if (
901 pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK
902 ) {
903 const char *sqlstate;
904 const char *errmsg;
905 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SEVERITY));
906 lua_setfield(L, 5, "pg_severity");
907 sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
908 if (sqlstate) {
909 lua_pushstring(L, sqlstate);
910 lua_setfield(L, 5, "pg_sqlstate");
911 lua_pushstring(L, mondelefant_translate_errcode(sqlstate));
912 lua_setfield(L, 5, "code");
913 } else {
914 lua_pushliteral(L, MONDELEFANT_ERRCODE_UNKNOWN);
915 lua_setfield(L, 5, "code");
916 }
917 errmsg = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
918 if (errmsg) {
919 mondelefant_push_first_line(L, errmsg);
920 lua_setfield(L, 5, "message");
921 lua_pushstring(L, errmsg);
922 lua_setfield(L, 5, "pg_message_primary");
923 } else {
924 lua_pushliteral(L,
925 "Error while fetching result, but no error message given."
926 );
927 lua_setfield(L, 5, "message");
928 }
929 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL));
930 lua_setfield(L, 5, "pg_message_detail");
931 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_HINT));
932 lua_setfield(L, 5, "pg_message_hint");
933 // NOTE: "position" and "pg_internal_position" are recalculated to
934 // byte offsets, as Lua 5.1 is not Unicode aware.
935 {
936 char *tmp;
937 tmp = PQresultErrorField(res, PG_DIAG_STATEMENT_POSITION);
938 if (tmp) {
939 int pos;
940 pos = atoi(tmp) - 1;
941 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
942 pos = utf8_position_to_byte(command, pos);
943 }
944 lua_pushinteger(L, pos + 1);
945 lua_setfield(L, 5, "position");
946 }
947 }
948 {
949 const char *internal_query;
950 internal_query = PQresultErrorField(res, PG_DIAG_INTERNAL_QUERY);
951 lua_pushstring(L, internal_query);
952 lua_setfield(L, 5, "pg_internal_query");
953 char *tmp;
954 tmp = PQresultErrorField(res, PG_DIAG_INTERNAL_POSITION);
955 if (tmp) {
956 int pos;
957 pos = atoi(tmp) - 1;
958 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
959 pos = utf8_position_to_byte(internal_query, pos);
960 }
961 lua_pushinteger(L, pos + 1);
962 lua_setfield(L, 5, "pg_internal_position");
963 }
964 }
965 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_CONTEXT));
966 lua_setfield(L, 5, "pg_context");
967 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FILE));
968 lua_setfield(L, 5, "pg_source_file");
969 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_LINE));
970 lua_setfield(L, 5, "pg_source_line");
971 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FUNCTION));
972 lua_setfield(L, 5, "pg_source_function");
973 } else if (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) {
974 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_NO_ROWS);
975 lua_setfield(L, 5, "code");
976 lua_pushliteral(L, "Expected one row, but got empty set.");
977 lua_setfield(L, 5, "message");
978 } else if (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST) {
979 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS);
980 lua_setfield(L, 5, "code");
981 lua_pushliteral(L, "Got more than one result row.");
982 lua_setfield(L, 5, "message");
983 } else {
984 // should not happen
985 abort();
986 }
987 if (res) {
988 PQclear(res);
989 while ((res = PQgetResult(conn->pgconn))) PQclear(res);
990 }
991 if (lua_toboolean(L, 3)) {
992 lua_pushvalue(L, 3);
993 lua_pushvalue(L, 5);
994 lua_call(L, 1, 0);
995 }
996 return 1;
997 }
998 // call "create_list" or "create_object" method of database handle,
999 // result will be at stack position 5:
1000 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
1001 lua_pushcfunction(L, mondelefant_conn_create_list); // 5
1002 lua_pushvalue(L, 1); // 6
1003 lua_call(L, 1, 1); // 5
1004 } else {
1005 lua_pushcfunction(L, mondelefant_conn_create_object); // 5
1006 lua_pushvalue(L, 1); // 6
1007 lua_call(L, 1, 1); // 5
1008 }
1009 // set "_column_info":
1010 lua_newtable(L); // 6
1011 for (col = 0; col < cols; col++) {
1012 lua_newtable(L); // 7
1013 lua_pushstring(L, PQfname(res, col));
1014 lua_setfield(L, 7, "field_name");
1015 {
1016 Oid tmp;
1017 tmp = PQftable(res, col);
1018 if (tmp == InvalidOid) lua_pushnil(L);
1019 else lua_pushinteger(L, tmp);
1020 lua_setfield(L, 7, "table_oid");
1021 }
1022 {
1023 int tmp;
1024 tmp = PQftablecol(res, col);
1025 if (tmp == 0) lua_pushnil(L);
1026 else lua_pushinteger(L, tmp);
1027 lua_setfield(L, 7, "table_column_number");
1028 }
1029 {
1030 Oid tmp;
1031 tmp = PQftype(res, col);
1032 binary[col] = (tmp == MONDELEFANT_POSTGRESQL_BINARY_OID);
1033 lua_pushinteger(L, tmp);
1034 lua_setfield(L, 7, "type_oid");
1035 lua_pushstring(L, mondelefant_oid_to_typestr(tmp));
1036 lua_setfield(L, 7, "type");
1037 }
1038 {
1039 int tmp;
1040 tmp = PQfmod(res, col);
1041 if (tmp == -1) lua_pushnil(L);
1042 else lua_pushinteger(L, tmp);
1043 lua_setfield(L, 7, "type_modifier");
1044 }
1045 lua_rawseti(L, 6, col+1);
1046 }
1047 lua_setfield(L, 5, "_column_info");
1048 // set "_rows_affected":
1049 {
1050 char *tmp;
1051 tmp = PQcmdTuples(res);
1052 if (tmp[0]) {
1053 lua_pushinteger(L, atoi(tmp));
1054 lua_setfield(L, 5, "_rows_affected");
1055 }
1056 }
1057 // set "_oid":
1058 {
1059 Oid tmp;
1060 tmp = PQoidValue(res);
1061 if (tmp != InvalidOid) {
1062 lua_pushinteger(L, tmp);
1063 lua_setfield(L, 5, "_oid");
1064 }
1065 }
1066 // copy data as strings or nil, while performing binary unescaping
1067 // automatically:
1068 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
1069 for (row = 0; row < rows; row++) {
1070 lua_pushcfunction(L, mondelefant_conn_create_object); // 6
1071 lua_pushvalue(L, 1); // 7
1072 lua_call(L, 1, 1); // 6
1073 for (col = 0; col < cols; col++) {
1074 if (PQgetisnull(res, row, col)) {
1075 lua_pushnil(L);
1076 } else if (binary[col]) {
1077 size_t binlen;
1078 char *binval;
1079 binval = (char *)PQunescapeBytea(
1080 (unsigned char *)PQgetvalue(res, row, col), &binlen
1081 );
1082 if (!binval) {
1083 return luaL_error(L,
1084 "Could not allocate memory for binary unescaping."
1085 );
1086 }
1087 lua_pushlstring(L, binval, binlen);
1088 PQfreemem(binval);
1089 } else {
1090 lua_pushstring(L, PQgetvalue(res, row, col));
1091 }
1092 lua_rawseti(L, 6, col+1);
1093 }
1094 lua_rawseti(L, 5, row+1);
1095 }
1096 } else if (rows == 1) {
1097 for (col = 0; col < cols; col++) {
1098 if (PQgetisnull(res, 0, col)) {
1099 lua_pushnil(L);
1100 } else if (binary[col]) {
1101 size_t binlen;
1102 char *binval;
1103 binval = (char *)PQunescapeBytea(
1104 (unsigned char *)PQgetvalue(res, 0, col), &binlen
1105 );
1106 if (!binval) {
1107 return luaL_error(L,
1108 "Could not allocate memory for binary unescaping."
1109 );
1110 }
1111 lua_pushlstring(L, binval, binlen);
1112 PQfreemem(binval);
1113 } else {
1114 lua_pushstring(L, PQgetvalue(res, 0, col));
1115 }
1116 lua_rawseti(L, 5, col+1);
1117 }
1118 } else {
1119 // no row in optrow mode
1120 lua_pop(L, 1);
1121 lua_pushnil(L);
1122 }
1123 // save result in result list:
1124 lua_rawseti(L, 4, command_idx+1);
1125 // extra assertion:
1126 if (lua_gettop(L) != 4) abort(); // should not happen
1127 // free memory acquired by libpq:
1128 PQclear(res);
1129 }
1130 // trace callback at stack position 3
1131 // result at stack position 4 (top of stack)
1132 // if a trace callback is existent, then call:
1133 if (lua_toboolean(L, 3)) {
1134 lua_pushvalue(L, 3);
1135 lua_call(L, 0, 0);
1136 }
1137 // put result at stack position 3:
1138 lua_replace(L, 3);
1139 // get output converter to stack position 4:
1140 lua_getfield(L, 1, "output_converter");
1141 // apply output converters and fill "_data" table according to column names:
1142 for (command_idx = 0; command_idx < command_count; command_idx++) {
1143 int mode;
1144 mode = modes[command_idx];
1145 lua_rawgeti(L, 3, command_idx+1); // raw result at stack position 5
1146 if (lua_toboolean(L, 5)) {
1147 lua_getfield(L, 5, "_column_info"); // column_info list at position 6
1148 #if LUA_VERSION_NUM >= 502
1149 cols = lua_rawlen(L, 6);
1150 #else
1151 cols = lua_objlen(L, 6);
1152 #endif
1153 if (mode == MONDELEFANT_QUERY_MODE_LIST) {
1154 #if LUA_VERSION_NUM >= 502
1155 rows = lua_rawlen(L, 5);
1156 #else
1157 rows = lua_objlen(L, 5);
1158 #endif
1159 for (row = 0; row < rows; row++) {
1160 lua_rawgeti(L, 5, row+1); // row at stack position 7
1161 lua_getfield(L, 7, "_data"); // _data table at stack position 8
1162 for (col = 0; col < cols; col++) {
1163 lua_rawgeti(L, 6, col+1); // this column info at position 9
1164 lua_getfield(L, 9, "field_name"); // 10
1165 if (lua_toboolean(L, 4)) {
1166 lua_pushvalue(L, 4); // output-converter
1167 lua_pushvalue(L, 1); // connection
1168 lua_rawgeti(L, 7, col+1); // raw-value
1169 lua_pushvalue(L, 9); // this column info
1170 lua_call(L, 3, 1); // converted value at position 11
1171 } else {
1172 lua_rawgeti(L, 7, col+1); // raw-value at position 11
1173 }
1174 lua_pushvalue(L, 11); // 12
1175 lua_rawseti(L, 7, col+1);
1176 lua_rawset(L, 8);
1177 lua_settop(L, 8);
1178 }
1179 lua_settop(L, 6);
1180 }
1181 } else {
1182 lua_getfield(L, 5, "_data"); // _data table at stack position 7
1183 for (col = 0; col < cols; col++) {
1184 lua_rawgeti(L, 6, col+1); // this column info at position 8
1185 lua_getfield(L, 8, "field_name"); // 9
1186 if (lua_toboolean(L, 4)) {
1187 lua_pushvalue(L, 4); // output-converter
1188 lua_pushvalue(L, 1); // connection
1189 lua_rawgeti(L, 5, col+1); // raw-value
1190 lua_pushvalue(L, 8); // this column info
1191 lua_call(L, 3, 1); // converted value at position 10
1192 } else {
1193 lua_rawgeti(L, 5, col+1); // raw-value at position 10
1194 }
1195 lua_pushvalue(L, 10); // 11
1196 lua_rawseti(L, 5, col+1);
1197 lua_rawset(L, 7);
1198 lua_settop(L, 7);
1199 }
1200 }
1201 }
1202 lua_settop(L, 4);
1203 }
1204 // return nil as first result value, followed by result lists/objects:
1205 lua_settop(L, 3);
1206 lua_pushnil(L);
1207 for (command_idx = 0; command_idx < command_count; command_idx++) {
1208 lua_rawgeti(L, 3, command_idx+1);
1209 }
1210 return command_count+1;
1211 }
1213 // method "escalate" of error objects:
1214 static int mondelefant_errorobject_escalate(lua_State *L) {
1215 // check, if we may throw an error object instead of an error string:
1216 lua_settop(L, 1);
1217 lua_getfield(L, 1, "connection"); // 2
1218 lua_getfield(L, 2, "error_objects"); // 3
1219 if (lua_toboolean(L, 3)) {
1220 // throw error object:
1221 lua_settop(L, 1);
1222 return lua_error(L);
1223 } else {
1224 // throw error string:
1225 lua_getfield(L, 1, "message"); // 4
1226 if (lua_isnil(L, 4)) {
1227 return luaL_error(L, "No error message given for escalation.");
1228 }
1229 return lua_error(L);
1230 }
1231 }
1233 // method "is_kind_of" of error objects:
1234 static int mondelefant_errorobject_is_kind_of(lua_State *L) {
1235 lua_settop(L, 2);
1236 lua_getfield(L, 1, "code"); // 3
1237 if (lua_isstring(L, 3)) {
1238 lua_pushboolean(L,
1239 mondelefant_check_error_class(
1240 lua_tostring(L, 3), luaL_checkstring(L, 2)
1241 )
1242 );
1243 } else {
1244 // only happens for errors where code is not set
1245 lua_pushboolean(L, 0);
1246 }
1247 return 1;
1248 }
1250 // method "query" of database handles:
1251 static int mondelefant_conn_query(lua_State *L) {
1252 int argc;
1253 // count number of arguments:
1254 argc = lua_gettop(L);
1255 // insert "try_query" function/method at stack position 1:
1256 lua_pushcfunction(L, mondelefant_conn_try_query);
1257 lua_insert(L, 1);
1258 // call "try_query" method:
1259 lua_call(L, argc, LUA_MULTRET); // results (with error) starting at index 1
1260 // check, if error occurred:
1261 if (lua_toboolean(L, 1)) {
1262 // invoke escalate method of error object:
1263 lua_pushcfunction(L, mondelefant_errorobject_escalate);
1264 lua_pushvalue(L, 1);
1265 lua_call(L, 1, 0); // will raise an error
1266 return 0; // should not be executed
1267 } else {
1268 // return everything but nil error object:
1269 return lua_gettop(L) - 1;
1270 }
1271 }
1273 // library function "set_class":
1274 static int mondelefant_set_class(lua_State *L) {
1275 // ensure that first argument is a database result list/object:
1276 lua_settop(L, 2);
1277 lua_getmetatable(L, 1); // 3
1278 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 4
1279 #if LUA_VERSION_NUM >= 502
1280 luaL_argcheck(L, lua_compare(L, 3, 4, LUA_OPEQ), 1, "not a database result");
1281 #else
1282 luaL_argcheck(L, lua_equal(L, 3, 4), 1, "not a database result");
1283 #endif
1284 // ensure that second argument is a database class (model):
1285 lua_settop(L, 2);
1286 lua_getmetatable(L, 2); // 3
1287 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_MT_REGKEY); // 4
1288 #if LUA_VERSION_NUM >= 502
1289 luaL_argcheck(L, lua_compare(L, 3, 4, LUA_OPEQ), 2, "not a database class");
1290 #else
1291 luaL_argcheck(L, lua_equal(L, 3, 4), 2, "not a database class");
1292 #endif
1293 // set attribute "_class" of result list/object to given class:
1294 lua_settop(L, 2);
1295 lua_pushvalue(L, 2); // 3
1296 lua_setfield(L, 1, "_class");
1297 // test, if database result is a list (and not a single object):
1298 lua_getfield(L, 1, "_type"); // 3
1299 lua_pushliteral(L, "list"); // 4
1300 if (lua_rawequal(L, 3, 4)) {
1301 int i;
1302 // set attribute "_class" of all elements to given class:
1303 #if LUA_VERSION_NUM >= 502
1304 for (i=0; i < lua_rawlen(L, 1); i++) {
1305 #else
1306 for (i=0; i < lua_objlen(L, 1); i++) {
1307 #endif
1308 lua_settop(L, 2);
1309 lua_rawgeti(L, 1, i+1); // 3
1310 lua_pushvalue(L, 2); // 4
1311 lua_setfield(L, 3, "_class");
1312 }
1313 }
1314 // return first argument:
1315 lua_settop(L, 1);
1316 return 1;
1317 }
1319 // library function "new_class":
1320 static int mondelefant_new_class(lua_State *L) {
1321 // use first argument as template or create new table:
1322 lua_settop(L, 1);
1323 if (!lua_toboolean(L, 1)) {
1324 lua_settop(L, 0);
1325 lua_newtable(L); // 1
1326 }
1327 // set meta-table for database classes (models):
1328 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_MT_REGKEY); // 2
1329 lua_setmetatable(L, 1);
1330 // check, if "prototype" attribute is not set:
1331 lua_pushliteral(L, "prototype"); // 2
1332 lua_rawget(L, 1); // 2
1333 if (!lua_toboolean(L, 2)) {
1334 // set "prototype" attribute to default prototype:
1335 lua_pushliteral(L, "prototype"); // 3
1336 lua_getfield(L,
1337 LUA_REGISTRYINDEX,
1338 MONDELEFANT_CLASS_PROTO_REGKEY
1339 ); // 4
1340 lua_rawset(L, 1);
1341 }
1342 // set "object" attribute to empty table, unless it is already set:
1343 lua_settop(L, 1);
1344 lua_pushliteral(L, "object"); // 2
1345 lua_rawget(L, 1); // 2
1346 if (!lua_toboolean(L, 2)) {
1347 lua_pushliteral(L, "object"); // 3
1348 lua_newtable(L); // 4
1349 lua_rawset(L, 1);
1350 }
1351 // set "object_get" attribute to empty table, unless it is already set:
1352 lua_settop(L, 1);
1353 lua_pushliteral(L, "object_get"); // 2
1354 lua_rawget(L, 1); // 2
1355 if (!lua_toboolean(L, 2)) {
1356 lua_pushliteral(L, "object_get"); // 3
1357 lua_newtable(L); // 4
1358 lua_rawset(L, 1);
1359 }
1360 // set "object_set" attribute to empty table, unless it is already set:
1361 lua_settop(L, 1);
1362 lua_pushliteral(L, "object_set"); // 2
1363 lua_rawget(L, 1); // 2
1364 if (!lua_toboolean(L, 2)) {
1365 lua_pushliteral(L, "object_set"); // 3
1366 lua_newtable(L); // 4
1367 lua_rawset(L, 1);
1368 }
1369 // set "list" attribute to empty table, unless it is already set:
1370 lua_settop(L, 1);
1371 lua_pushliteral(L, "list"); // 2
1372 lua_rawget(L, 1); // 2
1373 if (!lua_toboolean(L, 2)) {
1374 lua_pushliteral(L, "list"); // 3
1375 lua_newtable(L); // 4
1376 lua_rawset(L, 1);
1377 }
1378 // set "references" attribute to empty table, unless it is already set:
1379 lua_settop(L, 1);
1380 lua_pushliteral(L, "references"); // 2
1381 lua_rawget(L, 1); // 2
1382 if (!lua_toboolean(L, 2)) {
1383 lua_pushliteral(L, "references"); // 3
1384 lua_newtable(L); // 4
1385 lua_rawset(L, 1);
1386 }
1387 // set "foreign_keys" attribute to empty table, unless it is already set:
1388 lua_settop(L, 1);
1389 lua_pushliteral(L, "foreign_keys"); // 2
1390 lua_rawget(L, 1); // 2
1391 if (!lua_toboolean(L, 2)) {
1392 lua_pushliteral(L, "foreign_keys"); // 3
1393 lua_newtable(L); // 4
1394 lua_rawset(L, 1);
1395 }
1396 // return table:
1397 lua_settop(L, 1);
1398 return 1;
1399 }
1401 // method "get_reference" of classes (models):
1402 static int mondelefant_class_get_reference(lua_State *L) {
1403 lua_settop(L, 2);
1404 while (lua_toboolean(L, 1)) {
1405 // get "references" table:
1406 lua_getfield(L, 1, "references"); // 3
1407 // perform lookup:
1408 lua_pushvalue(L, 2); // 4
1409 lua_gettable(L, 3); // 4
1410 // return result, if lookup was successful:
1411 if (!lua_isnil(L, 4)) return 1;
1412 // replace current table by its prototype:
1413 lua_settop(L, 2);
1414 lua_pushliteral(L, "prototype"); // 3
1415 lua_rawget(L, 1); // 3
1416 lua_replace(L, 1);
1417 }
1418 // return nothing:
1419 return 0;
1420 }
1422 // method "iterate_over_references" of classes (models):
1423 static int mondelefant_class_iterate_over_references(lua_State *L) {
1424 return luaL_error(L, "Reference iterator not implemented yet."); // TODO
1425 }
1427 // method "get_foreign_key_reference_name" of classes (models):
1428 static int mondelefant_class_get_foreign_key_reference_name(lua_State *L) {
1429 lua_settop(L, 2);
1430 while (lua_toboolean(L, 1)) {
1431 // get "foreign_keys" table:
1432 lua_getfield(L, 1, "foreign_keys"); // 3
1433 // perform lookup:
1434 lua_pushvalue(L, 2); // 4
1435 lua_gettable(L, 3); // 4
1436 // return result, if lookup was successful:
1437 if (!lua_isnil(L, 4)) return 1;
1438 // replace current table by its prototype:
1439 lua_settop(L, 2);
1440 lua_pushliteral(L, "prototype"); // 3
1441 lua_rawget(L, 1); // 3
1442 lua_replace(L, 1);
1443 }
1444 // return nothing:
1445 return 0;
1446 }
1448 // meta-method "__index" of database result lists and objects:
1449 static int mondelefant_result_index(lua_State *L) {
1450 const char *result_type;
1451 // only lookup, when key is a string not beginning with an underscore:
1452 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
1453 return 0;
1454 }
1455 // get value of "_class" attribute, or default class, when unset:
1456 lua_settop(L, 2);
1457 lua_getfield(L, 1, "_class"); // 3
1458 if (!lua_toboolean(L, 3)) {
1459 lua_settop(L, 2);
1460 lua_getfield(L,
1461 LUA_REGISTRYINDEX,
1462 MONDELEFANT_CLASS_PROTO_REGKEY
1463 ); // 3
1464 }
1465 // get value of "_type" attribute:
1466 lua_getfield(L, 1, "_type"); // 4
1467 result_type = lua_tostring(L, 4);
1468 // different lookup for lists and objects:
1469 if (result_type && !strcmp(result_type, "object")) { // object
1470 lua_settop(L, 3);
1471 // try inherited attributes, methods or getter functions:
1472 while (lua_toboolean(L, 3)) {
1473 lua_getfield(L, 3, "object"); // 4
1474 lua_pushvalue(L, 2); // 5
1475 lua_gettable(L, 4); // 5
1476 if (!lua_isnil(L, 5)) return 1;
1477 lua_settop(L, 3);
1478 lua_getfield(L, 3, "object_get"); // 4
1479 lua_pushvalue(L, 2); // 5
1480 lua_gettable(L, 4); // 5
1481 if (lua_toboolean(L, 5)) {
1482 lua_pushvalue(L, 1); // 6
1483 lua_call(L, 1, 1); // 5
1484 return 1;
1485 }
1486 lua_settop(L, 3);
1487 lua_pushliteral(L, "prototype"); // 4
1488 lua_rawget(L, 3); // 4
1489 lua_replace(L, 3);
1490 }
1491 lua_settop(L, 2);
1492 // try primary keys of referenced objects:
1493 lua_pushcfunction(L,
1494 mondelefant_class_get_foreign_key_reference_name
1495 ); // 3
1496 lua_getfield(L, 1, "_class"); // 4
1497 lua_pushvalue(L, 2); // 5
1498 lua_call(L, 2, 1); // 3
1499 if (!lua_isnil(L, 3)) {
1500 // reference name at stack position 3
1501 lua_pushcfunction(L, mondelefant_class_get_reference); // 4
1502 lua_getfield(L, 1, "_class"); // 5
1503 lua_pushvalue(L, 3); // 6
1504 lua_call(L, 2, 1); // reference info at stack position 4
1505 lua_getfield(L, 1, "_ref"); // 5
1506 lua_getfield(L, 4, "ref"); // 6
1507 lua_gettable(L, 5); // 6
1508 if (!lua_isnil(L, 6)) {
1509 if (lua_toboolean(L, 6)) {
1510 lua_getfield(L, 4, "that_key"); // 7
1511 if (lua_isnil(L, 7)) {
1512 return luaL_error(L, "Missing 'that_key' entry in model reference.");
1513 }
1514 lua_gettable(L, 6); // 7
1515 } else {
1516 lua_pushnil(L);
1517 }
1518 return 1;
1519 }
1520 }
1521 lua_settop(L, 2);
1522 // try normal data field info:
1523 lua_getfield(L, 1, "_data"); // 3
1524 lua_pushvalue(L, 2); // 4
1525 lua_gettable(L, 3); // 4
1526 if (!lua_isnil(L, 4)) return 1;
1527 lua_settop(L, 2);
1528 // try cached referenced object (or cached NULL reference):
1529 lua_getfield(L, 1, "_ref"); // 3
1530 lua_pushvalue(L, 2); // 4
1531 lua_gettable(L, 3); // 4
1532 if (lua_isboolean(L, 4) && !lua_toboolean(L, 4)) {
1533 lua_pushnil(L);
1534 return 1;
1535 } else if (!lua_isnil(L, 4)) {
1536 return 1;
1537 }
1538 lua_settop(L, 2);
1539 // try to load a referenced object:
1540 lua_pushcfunction(L, mondelefant_class_get_reference); // 3
1541 lua_getfield(L, 1, "_class"); // 4
1542 lua_pushvalue(L, 2); // 5
1543 lua_call(L, 2, 1); // 3
1544 if (!lua_isnil(L, 3)) {
1545 lua_settop(L, 2);
1546 lua_getfield(L, 1, "load"); // 3
1547 lua_pushvalue(L, 1); // 4 (self)
1548 lua_pushvalue(L, 2); // 5
1549 lua_call(L, 2, 0);
1550 lua_settop(L, 2);
1551 lua_getfield(L, 1, "_ref"); // 3
1552 lua_pushvalue(L, 2); // 4
1553 lua_gettable(L, 3); // 4
1554 if (lua_isboolean(L, 4) && !lua_toboolean(L, 4)) lua_pushnil(L); // TODO: use special object instead of false
1555 return 1;
1556 }
1557 return 0;
1558 } else if (result_type && !strcmp(result_type, "list")) { // list
1559 lua_settop(L, 3);
1560 // try inherited list attributes or methods:
1561 while (lua_toboolean(L, 3)) {
1562 lua_getfield(L, 3, "list"); // 4
1563 lua_pushvalue(L, 2); // 5
1564 lua_gettable(L, 4); // 5
1565 if (!lua_isnil(L, 5)) return 1;
1566 lua_settop(L, 3);
1567 lua_pushliteral(L, "prototype"); // 4
1568 lua_rawget(L, 3); // 4
1569 lua_replace(L, 3);
1570 }
1571 }
1572 // return nothing:
1573 return 0;
1574 }
1576 // meta-method "__newindex" of database result lists and objects:
1577 static int mondelefant_result_newindex(lua_State *L) {
1578 const char *result_type;
1579 // perform rawset, unless key is a string not starting with underscore:
1580 lua_settop(L, 3);
1581 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
1582 lua_rawset(L, 1);
1583 return 1;
1584 }
1585 // get value of "_class" attribute, or default class, when unset:
1586 lua_getfield(L, 1, "_class"); // 4
1587 if (!lua_toboolean(L, 4)) {
1588 lua_settop(L, 3);
1589 lua_getfield(L,
1590 LUA_REGISTRYINDEX,
1591 MONDELEFANT_CLASS_PROTO_REGKEY
1592 ); // 4
1593 }
1594 // get value of "_type" attribute:
1595 lua_getfield(L, 1, "_type"); // 5
1596 result_type = lua_tostring(L, 5);
1597 // distinguish between lists and objects:
1598 if (result_type && !strcmp(result_type, "object")) { // objects
1599 lua_settop(L, 4);
1600 // try object setter functions:
1601 while (lua_toboolean(L, 4)) {
1602 lua_getfield(L, 4, "object_set"); // 5
1603 lua_pushvalue(L, 2); // 6
1604 lua_gettable(L, 5); // 6
1605 if (lua_toboolean(L, 6)) {
1606 lua_pushvalue(L, 1); // 7
1607 lua_pushvalue(L, 3); // 8
1608 lua_call(L, 2, 0);
1609 return 0;
1610 }
1611 lua_settop(L, 4);
1612 lua_pushliteral(L, "prototype"); // 5
1613 lua_rawget(L, 4); // 5
1614 lua_replace(L, 4);
1615 }
1616 lua_settop(L, 3);
1617 // check, if a object reference is changed:
1618 lua_pushcfunction(L, mondelefant_class_get_reference); // 4
1619 lua_getfield(L, 1, "_class"); // 5
1620 lua_pushvalue(L, 2); // 6
1621 lua_call(L, 2, 1); // 4
1622 if (!lua_isnil(L, 4)) {
1623 // store object in _ref table (use false for nil): // TODO: use special object instead of false
1624 lua_getfield(L, 1, "_ref"); // 5
1625 lua_pushvalue(L, 2); // 6
1626 if (lua_isnil(L, 3)) lua_pushboolean(L, 0); // 7
1627 else lua_pushvalue(L, 3); // 7
1628 lua_settable(L, 5);
1629 lua_settop(L, 4);
1630 // delete referencing key from _data table:
1631 lua_getfield(L, 4, "this_key"); // 5
1632 if (lua_isnil(L, 5)) {
1633 return luaL_error(L, "Missing 'this_key' entry in model reference.");
1634 }
1635 lua_getfield(L, 1, "_data"); // 6
1636 lua_pushvalue(L, 5); // 7
1637 lua_pushnil(L); // 8
1638 lua_settable(L, 6);
1639 lua_settop(L, 5);
1640 lua_getfield(L, 1, "_dirty"); // 6
1641 lua_pushvalue(L, 5); // 7
1642 lua_pushboolean(L, 1); // 8
1643 lua_settable(L, 6);
1644 return 0;
1645 }
1646 lua_settop(L, 3);
1647 // store value in data field info:
1648 lua_getfield(L, 1, "_data"); // 4
1649 lua_pushvalue(L, 2); // 5
1650 lua_pushvalue(L, 3); // 6
1651 lua_settable(L, 4);
1652 lua_settop(L, 3);
1653 // mark field as dirty (needs to be UPDATEd on save):
1654 lua_getfield(L, 1, "_dirty"); // 4
1655 lua_pushvalue(L, 2); // 5
1656 lua_pushboolean(L, 1); // 6
1657 lua_settable(L, 4);
1658 lua_settop(L, 3);
1659 // reset reference cache, if neccessary:
1660 lua_pushcfunction(L,
1661 mondelefant_class_get_foreign_key_reference_name
1662 ); // 4
1663 lua_getfield(L, 1, "_class"); // 5
1664 lua_pushvalue(L, 2); // 6
1665 lua_call(L, 2, 1); // 4
1666 if (!lua_isnil(L, 4)) {
1667 lua_getfield(L, 1, "_ref"); // 5
1668 lua_pushvalue(L, 4); // 6
1669 lua_pushnil(L); // 7
1670 lua_settable(L, 5);
1671 }
1672 return 0;
1673 } else { // non-objects (i.e. lists)
1674 // perform rawset:
1675 lua_settop(L, 3);
1676 lua_rawset(L, 1);
1677 return 0;
1678 }
1679 }
1681 // meta-method "__index" of classes (models):
1682 static int mondelefant_class_index(lua_State *L) {
1683 // perform lookup in prototype:
1684 lua_settop(L, 2);
1685 lua_pushliteral(L, "prototype"); // 3
1686 lua_rawget(L, 1); // 3
1687 lua_pushvalue(L, 2); // 4
1688 lua_gettable(L, 3); // 4
1689 return 1;
1690 }
1692 // registration information for functions of library:
1693 static const struct luaL_Reg mondelefant_module_functions[] = {
1694 {"connect", mondelefant_connect},
1695 {"set_class", mondelefant_set_class},
1696 {"new_class", mondelefant_new_class},
1697 {NULL, NULL}
1698 };
1700 // registration information for meta-methods of database connections:
1701 static const struct luaL_Reg mondelefant_conn_mt_functions[] = {
1702 {"__gc", mondelefant_conn_free},
1703 {"__index", mondelefant_conn_index},
1704 {"__newindex", mondelefant_conn_newindex},
1705 {NULL, NULL}
1706 };
1708 // registration information for methods of database connections:
1709 static const struct luaL_Reg mondelefant_conn_methods[] = {
1710 {"close", mondelefant_conn_close},
1711 {"is_ok", mondelefant_conn_is_ok},
1712 {"get_transaction_status", mondelefant_conn_get_transaction_status},
1713 {"create_list", mondelefant_conn_create_list},
1714 {"create_object", mondelefant_conn_create_object},
1715 {"quote_string", mondelefant_conn_quote_string},
1716 {"quote_binary", mondelefant_conn_quote_binary},
1717 {"assemble_command", mondelefant_conn_assemble_command},
1718 {"try_query", mondelefant_conn_try_query},
1719 {"query", mondelefant_conn_query},
1720 {NULL, NULL}
1721 };
1723 // registration information for meta-methods of error objects:
1724 static const struct luaL_Reg mondelefant_errorobject_mt_functions[] = {
1725 {NULL, NULL}
1726 };
1728 // registration information for methods of error objects:
1729 static const struct luaL_Reg mondelefant_errorobject_methods[] = {
1730 {"escalate", mondelefant_errorobject_escalate},
1731 {"is_kind_of", mondelefant_errorobject_is_kind_of},
1732 {NULL, NULL}
1733 };
1735 // registration information for meta-methods of database result lists/objects:
1736 static const struct luaL_Reg mondelefant_result_mt_functions[] = {
1737 {"__index", mondelefant_result_index},
1738 {"__newindex", mondelefant_result_newindex},
1739 {NULL, NULL}
1740 };
1742 // registration information for methods of database result lists/objects:
1743 static const struct luaL_Reg mondelefant_class_mt_functions[] = {
1744 {"__index", mondelefant_class_index},
1745 {NULL, NULL}
1746 };
1748 // registration information for methods of classes (models):
1749 static const struct luaL_Reg mondelefant_class_methods[] = {
1750 {"get_reference", mondelefant_class_get_reference},
1751 {"iterate_over_references", mondelefant_class_iterate_over_references},
1752 {"get_foreign_key_reference_name",
1753 mondelefant_class_get_foreign_key_reference_name},
1754 {NULL, NULL}
1755 };
1757 // registration information for methods of database result objects (not lists!):
1758 static const struct luaL_Reg mondelefant_object_methods[] = {
1759 {NULL, NULL}
1760 };
1762 // registration information for methods of database result lists (not single objects!):
1763 static const struct luaL_Reg mondelefant_list_methods[] = {
1764 {NULL, NULL}
1765 };
1767 // luaopen function to initialize/register library:
1768 int luaopen_mondelefant_native(lua_State *L) {
1769 lua_settop(L, 0);
1770 lua_newtable(L); // module at stack position 1
1771 #if LUA_VERSION_NUM >= 502
1772 luaL_setfuncs(L, mondelefant_module_functions, 0);
1773 #else
1774 luaL_register(L, NULL, mondelefant_module_functions);
1775 #endif
1777 lua_pushvalue(L, 1); // 2
1778 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
1780 lua_newtable(L); // 2
1781 // NOTE: only PostgreSQL is supported yet:
1782 #if LUA_VERSION_NUM >= 502
1783 luaL_setfuncs(L, mondelefant_conn_methods, 0);
1784 #else
1785 luaL_register(L, NULL, mondelefant_conn_methods);
1786 #endif
1787 lua_setfield(L, 1, "postgresql_connection_prototype");
1788 lua_newtable(L); // 2
1789 lua_setfield(L, 1, "connection_prototype");
1791 luaL_newmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
1792 #if LUA_VERSION_NUM >= 502
1793 luaL_setfuncs(L, mondelefant_conn_mt_functions, 0);
1794 #else
1795 luaL_register(L, NULL, mondelefant_conn_mt_functions);
1796 #endif
1797 lua_settop(L, 1);
1798 luaL_newmetatable(L, MONDELEFANT_RESULT_MT_REGKEY); // 2
1799 #if LUA_VERSION_NUM >= 502
1800 luaL_setfuncs(L, mondelefant_result_mt_functions, 0);
1801 #else
1802 luaL_register(L, NULL, mondelefant_result_mt_functions);
1803 #endif
1804 lua_setfield(L, 1, "result_metatable");
1805 luaL_newmetatable(L, MONDELEFANT_CLASS_MT_REGKEY); // 2
1806 #if LUA_VERSION_NUM >= 502
1807 luaL_setfuncs(L, mondelefant_class_mt_functions, 0);
1808 #else
1809 luaL_register(L, NULL, mondelefant_class_mt_functions);
1810 #endif
1811 lua_setfield(L, 1, "class_metatable");
1813 lua_newtable(L); // 2
1814 lua_newtable(L); // 3
1815 #if LUA_VERSION_NUM >= 502
1816 luaL_setfuncs(L, mondelefant_object_methods, 0);
1817 #else
1818 luaL_register(L, NULL, mondelefant_object_methods);
1819 #endif
1820 lua_setfield(L, 2, "object");
1821 lua_newtable(L); // 3
1822 lua_setfield(L, 2, "object_get");
1823 lua_newtable(L); // 3
1824 lua_setfield(L, 2, "object_set");
1825 lua_newtable(L); // 3
1826 #if LUA_VERSION_NUM >= 502
1827 luaL_setfuncs(L, mondelefant_list_methods, 0);
1828 #else
1829 luaL_register(L, NULL, mondelefant_list_methods);
1830 #endif
1831 lua_setfield(L, 2, "list");
1832 lua_newtable(L); // 3
1833 lua_setfield(L, 2, "references");
1834 lua_newtable(L); // 3
1835 lua_setfield(L, 2, "foreign_keys");
1836 lua_pushvalue(L, 2); // 3
1837 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_PROTO_REGKEY);
1838 lua_setfield(L, 1, "class_prototype");
1840 lua_newtable(L); // 2
1841 lua_pushliteral(L, "k"); // 3
1842 lua_setfield(L, 2, "__mode");
1843 lua_newtable(L); // 3
1844 lua_pushvalue(L, 2); // 4
1845 lua_setmetatable(L, 3);
1846 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CONN_DATA_REGKEY);
1847 lua_settop(L, 1);
1849 luaL_newmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY); // 2
1850 #if LUA_VERSION_NUM >= 502
1851 luaL_setfuncs(L, mondelefant_errorobject_mt_functions, 0);
1852 #else
1853 luaL_register(L, NULL, mondelefant_errorobject_mt_functions);
1854 #endif
1855 lua_newtable(L); // 3
1856 #if LUA_VERSION_NUM >= 502
1857 luaL_setfuncs(L, mondelefant_errorobject_methods, 0);
1858 #else
1859 luaL_register(L, NULL, mondelefant_errorobject_methods);
1860 #endif
1861 lua_setfield(L, 2, "__index");
1862 lua_setfield(L, 1, "errorobject_metatable");
1864 return 1;
1865 }