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annotate libraries/mondelefant/mondelefant.lua @ 192:33c8f7029cfa

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Minimum decimal floating point precision of 16 in json.encode(...)
author jbe
date Sun Aug 10 20:18:57 2014 +0200 (2014-08-10)
parents 937bbe05098c
children d2429d53a158
rev   line source
jbe/bsw@0 1 #!/usr/bin/env lua
jbe/bsw@0 2
jbe/bsw@0 3
jbe/bsw@0 4 ---------------------------
jbe/bsw@0 5 -- module initialization --
jbe/bsw@0 6 ---------------------------
jbe/bsw@0 7
jbe/bsw@0 8 local _G = _G
jbe/bsw@0 9 local _VERSION = _VERSION
jbe/bsw@0 10 local assert = assert
jbe/bsw@0 11 local error = error
jbe/bsw@0 12 local getmetatable = getmetatable
jbe/bsw@0 13 local ipairs = ipairs
jbe/bsw@0 14 local next = next
jbe/bsw@0 15 local pairs = pairs
jbe/bsw@0 16 local print = print
jbe/bsw@0 17 local rawequal = rawequal
jbe/bsw@0 18 local rawget = rawget
jbe@64 19 local rawlen = rawlen
jbe/bsw@0 20 local rawset = rawset
jbe/bsw@0 21 local select = select
jbe/bsw@0 22 local setmetatable = setmetatable
jbe/bsw@0 23 local tonumber = tonumber
jbe/bsw@0 24 local tostring = tostring
jbe/bsw@0 25 local type = type
jbe/bsw@0 26
jbe/bsw@0 27 local math = math
jbe/bsw@0 28 local string = string
jbe/bsw@0 29 local table = table
jbe/bsw@0 30
jbe/bsw@0 31 local add = table.insert
jbe/bsw@0 32
jbe@64 33 local _M = require("mondelefant_native")
jbe@64 34 if _ENV then
jbe@64 35 _ENV = _M
jbe@64 36 else
jbe@64 37 _G[...] = _M
jbe@64 38 setfenv(1, _M)
jbe@64 39 end
jbe/bsw@0 40
jbe/bsw@0 41
jbe/bsw@0 42
jbe/bsw@0 43 ---------------
jbe/bsw@0 44 -- selectors --
jbe/bsw@0 45 ---------------
jbe/bsw@0 46
jbe/bsw@0 47 selector_metatable = {}
jbe/bsw@0 48 selector_prototype = {}
jbe/bsw@0 49 selector_metatable.__index = selector_prototype
jbe/bsw@0 50
jbe/bsw@0 51 local function init_selector(self, db_conn)
jbe/bsw@0 52 self._db_conn = db_conn
jbe/bsw@0 53 self._mode = "list"
jbe@39 54 self._with = { sep = ", " }
jbe/bsw@0 55 self._fields = { sep = ", " }
jbe/bsw@0 56 self._distinct = false
jbe/bsw@0 57 self._distinct_on = {sep = ", ", expression}
jbe/bsw@0 58 self._from = { sep = " " }
jbe/bsw@4 59 self._where = { sep = ") AND (" }
jbe/bsw@0 60 self._group_by = { sep = ", " }
jbe/bsw@4 61 self._having = { sep = ") AND (" }
jbe/bsw@0 62 self._combine = { sep = " " }
jbe/bsw@0 63 self._order_by = { sep = ", " }
jbe/bsw@0 64 self._limit = nil
jbe/bsw@0 65 self._offset = nil
jbe/bsw@4 66 self._read_lock = { sep = ", " }
jbe/bsw@4 67 self._write_lock = { sep = ", " }
jbe/bsw@0 68 self._class = nil
jbe/bsw@0 69 self._attach = nil
jbe/bsw@0 70 return self
jbe/bsw@0 71 end
jbe/bsw@0 72
jbe@23 73 --[[--
jbe@23 74 selector = -- new selector
jbe@23 75 <db_handle>:new_selector()
jbe@23 76
jbe@23 77 Creates a new selector to operate on the given database handle.
jbe@23 78 --]]--
jbe/bsw@0 79 function connection_prototype:new_selector()
jbe/bsw@0 80 return init_selector(setmetatable({}, selector_metatable), self)
jbe/bsw@0 81 end
jbe@23 82 --//--
jbe/bsw@0 83
jbe@23 84 --[[--
jbe@23 85 db_handle = -- handle of database connection
jbe@23 86 <db_selector>:get_db_conn()
jbe@23 87
jbe@23 88 Returns the database connection handle used by a selector.
jbe@23 89
jbe@23 90 --]]--
jbe/bsw@0 91 function selector_prototype:get_db_conn()
jbe/bsw@0 92 return self._db_conn
jbe/bsw@0 93 end
jbe@23 94 --//--
jbe/bsw@0 95
jbe/bsw@0 96 -- TODO: selector clone?
jbe/bsw@0 97
jbe@23 98 --[[--
jbe@23 99 db_selector = -- same selector returned
jbe@23 100 <db_selector>:single_object_mode()
jbe@23 101
jbe@23 102 Sets selector to single object mode (mode "object" passed to "query" method of database handle). The selector is modified and returned.
jbe@23 103
jbe@23 104 --]]--
jbe/bsw@0 105 function selector_prototype:single_object_mode()
jbe/bsw@0 106 self._mode = "object"
jbe/bsw@0 107 return self
jbe/bsw@0 108 end
jbe@23 109 --//--
jbe/bsw@0 110
jbe@23 111 --[[--
jbe@23 112 db_selector = -- same selector returned
jbe@23 113 <db_selector>:optional_object_mode()
jbe@23 114
jbe@23 115 Sets selector to single object mode (mode "opt_object" passed to "query" method of database handle). The selector is modified and returned.
jbe@23 116
jbe@23 117 --]]--
jbe/bsw@0 118 function selector_prototype:optional_object_mode()
jbe/bsw@0 119 self._mode = "opt_object"
jbe/bsw@0 120 return self
jbe/bsw@0 121 end
jbe@23 122 --//--
jbe/bsw@0 123
jbe@23 124 --[[--
jbe@23 125 db_selector = -- same selector returned
jbe@23 126 <db_selector>:empty_list_mode()
jbe@23 127
jbe@23 128 Sets selector to empty list mode. The selector is modified and returned. When using the selector, no SQL query will be issued, but instead an empty database result list is returned.
jbe@23 129
jbe@23 130 --]]--
jbe/bsw@0 131 function selector_prototype:empty_list_mode()
jbe/bsw@0 132 self._mode = "empty_list"
jbe/bsw@0 133 return self
jbe/bsw@0 134 end
jbe@23 135 --//--
jbe/bsw@0 136
jbe@23 137 --[[--
jbe@39 138 db_selector =
jbe@39 139 <db_selector>:add_with(
jbe@39 140 expression = expression,
jbe@39 141 selector = selector
jbe@39 142 )
jbe@39 143
jbe@39 144 Adds an WITH RECURSIVE expression to the selector. The selector is modified and returned.
jbe@39 145 --]]--
jbe@39 146 function selector_prototype:add_with(expression, selector)
jbe@39 147 add(self._with, {"$ AS ($)", {expression}, {selector}})
jbe@39 148 return self
jbe@39 149 end
jbe@39 150 --//--
jbe@39 151
jbe@39 152 --[[--
jbe@23 153 db_selector = -- same selector returned
jbe@23 154 <db_selector>:add_distinct_on(
jbe@23 155 expression -- expression as passed to "assemble_command"
jbe@23 156 )
jbe@23 157
jbe@23 158 Adds an DISTINCT ON expression to the selector. The selector is modified and returned.
jbe@23 159
jbe@23 160 --]]--
jbe/bsw@0 161 function selector_prototype:add_distinct_on(expression)
jbe/bsw@0 162 if self._distinct then
jbe/bsw@0 163 error("Can not combine DISTINCT with DISTINCT ON.")
jbe/bsw@0 164 end
jbe/bsw@0 165 add(self._distinct_on, expression)
jbe/bsw@0 166 return self
jbe/bsw@0 167 end
jbe@23 168 --//--
jbe/bsw@0 169
jbe@23 170 --[[--
jbe@23 171 db_selector = -- same selector returned
jbe@23 172 <db_selector>:set_distinct()
jbe@23 173
jbe@23 174 Sets selector to perform a SELECT DISTINCT instead of SELECT (ALL). The selector is modified and returned. This mode can not be combined with DISTINCT ON.
jbe@23 175
jbe@23 176 --]]--
jbe/bsw@0 177 function selector_prototype:set_distinct()
jbe/bsw@0 178 if #self._distinct_on > 0 then
jbe/bsw@0 179 error("Can not combine DISTINCT with DISTINCT ON.")
jbe/bsw@0 180 end
jbe/bsw@0 181 self._distinct = true
jbe/bsw@0 182 return self
jbe/bsw@0 183 end
jbe@23 184 --//--
jbe/bsw@0 185
jbe@23 186 --[[--
jbe@23 187 db_selector = -- same selector returned
jbe@23 188 <db_selector>:add_from(
jbe@23 189 expression, -- expression as passed to "assemble_command"
jbe@23 190 alias, -- optional alias expression as passed to "assemble_command"
jbe@23 191 condition -- optional condition expression as passed to "assemble_command"
jbe@23 192 )
jbe@23 193
jbe@23 194 Adds expressions for FROM clause to the selector. The selector is modified and returned. If an additional condition is given, an INNER JOIN will be used, otherwise a CROSS JOIN.
jbe@23 195
jbe@23 196 This method is identical to "join".
jbe@23 197
jbe@23 198 --]]--
jbe/bsw@0 199 function selector_prototype:add_from(expression, alias, condition)
jbe/bsw@0 200 local first = (#self._from == 0)
jbe/bsw@0 201 if not first then
jbe/bsw@0 202 if condition then
jbe/bsw@0 203 add(self._from, "INNER JOIN")
jbe/bsw@0 204 else
jbe/bsw@0 205 add(self._from, "CROSS JOIN")
jbe/bsw@0 206 end
jbe/bsw@0 207 end
jbe/bsw@0 208 if getmetatable(expression) == selector_metatable then
jbe/bsw@0 209 if alias then
jbe/bsw@0 210 add(self._from, {'($) AS "$"', {expression}, {alias}})
jbe/bsw@0 211 else
jbe/bsw@0 212 add(self._from, {'($) AS "subquery"', {expression}})
jbe/bsw@0 213 end
jbe/bsw@0 214 else
jbe/bsw@0 215 if alias then
jbe/bsw@0 216 add(self._from, {'$ AS "$"', {expression}, {alias}})
jbe/bsw@0 217 else
jbe/bsw@0 218 add(self._from, expression)
jbe/bsw@0 219 end
jbe/bsw@0 220 end
jbe/bsw@0 221 if condition then
jbe/bsw@0 222 if first then
jbe@55 223 self:add_where(condition)
jbe/bsw@0 224 else
jbe/bsw@0 225 add(self._from, "ON")
jbe/bsw@0 226 add(self._from, condition)
jbe/bsw@0 227 end
jbe/bsw@0 228 end
jbe/bsw@0 229 return self
jbe/bsw@0 230 end
jbe@23 231 --//--
jbe/bsw@0 232
jbe@23 233 --[[--
jbe@23 234 db_selector = -- same selector returned
jbe@23 235 <db_selector>:add_where(
jbe@23 236 expression -- expression as passed to "assemble_command"
jbe@23 237 )
jbe@23 238
jbe@23 239 Adds expressions for WHERE clause to the selector. The selector is modified and returned. Multiple calls cause expressions to be AND-combined.
jbe@23 240
jbe@23 241 --]]--
jbe/bsw@0 242 function selector_prototype:add_where(expression)
jbe/bsw@0 243 add(self._where, expression)
jbe/bsw@0 244 return self
jbe/bsw@0 245 end
jbe@23 246 --//--
jbe/bsw@0 247
jbe@23 248 --[[--
jbe@23 249 db_selector = -- same selector returned
jbe@23 250 <db_selector>:add_group_by(
jbe@23 251 expression -- expression as passed to "assemble_command"
jbe@23 252 )
jbe@23 253
jbe@23 254 Adds expressions for GROUP BY clause to the selector. The selector is modified and returned.
jbe@23 255
jbe@23 256 --]]--
jbe/bsw@0 257 function selector_prototype:add_group_by(expression)
jbe/bsw@0 258 add(self._group_by, expression)
jbe/bsw@0 259 return self
jbe/bsw@0 260 end
jbe@23 261 --//--
jbe/bsw@0 262
jbe@23 263 --[[--
jbe@23 264 db_selector = -- same selector returned
jbe@23 265 <db_selector>:add_having(
jbe@23 266 expression -- expression as passed to "assemble_command"
jbe@23 267 )
jbe@23 268
jbe@23 269 Adds expressions for HAVING clause to the selector. The selector is modified and returned. Multiple calls cause expressions to be AND-combined.
jbe@23 270
jbe@23 271 --]]--
jbe/bsw@0 272 function selector_prototype:add_having(expression)
jbe/bsw@0 273 add(self._having, expression)
jbe/bsw@0 274 return self
jbe/bsw@0 275 end
jbe@23 276 --//--
jbe/bsw@0 277
jbe@23 278 --[[--
jbe@23 279 db_selector = -- same selector returned
jbe@23 280 <db_selector>:add_combine(
jbe@23 281 expression -- expression as passed to "assemble_command"
jbe@23 282 )
jbe@23 283
jbe@23 284 This function is used for UNION/INTERSECT/EXCEPT clauses. It does not need to be called directly. Use "union", "union_all", "intersect", "intersect_all", "except" and "except_all" instead.
jbe@23 285
jbe@23 286 --]]--
jbe/bsw@0 287 function selector_prototype:add_combine(expression)
jbe/bsw@0 288 add(self._combine, expression)
jbe/bsw@0 289 return self
jbe/bsw@0 290 end
jbe@23 291 --//--
jbe/bsw@0 292
jbe@23 293 --[[--
jbe@23 294 db_selector = -- same selector returned
jbe@23 295 <db_selector>:add_order_by(
jbe@23 296 expression -- expression as passed to "assemble_command"
jbe@23 297 )
jbe@23 298
jbe@23 299 Adds expressions for ORDER BY clause to the selector. The selector is modified and returned.
jbe@23 300
jbe@23 301 --]]--
jbe/bsw@0 302 function selector_prototype:add_order_by(expression)
jbe/bsw@0 303 add(self._order_by, expression)
jbe/bsw@0 304 return self
jbe/bsw@0 305 end
jbe@23 306 --//--
jbe/bsw@0 307
jbe@23 308 --[[--
jbe@23 309 db_selector = -- same selector returned
jbe@23 310 <db_selector>:limit(
jbe@23 311 count -- integer used as LIMIT
jbe@23 312 )
jbe@23 313
jbe@23 314 Limits the number of rows to a given number, by using LIMIT. The selector is modified and returned.
jbe@23 315
jbe@23 316 --]]--
jbe/bsw@0 317 function selector_prototype:limit(count)
jbe/bsw@0 318 if type(count) ~= "number" or count % 1 ~= 0 then
jbe/bsw@0 319 error("LIMIT must be an integer.")
jbe/bsw@0 320 end
jbe/bsw@0 321 self._limit = count
jbe/bsw@0 322 return self
jbe/bsw@0 323 end
jbe@23 324 --//--
jbe/bsw@0 325
jbe@23 326 --[[--
jbe@23 327 db_selector = -- same selector returned
jbe@23 328 <db_selector>:offset(
jbe@23 329 count -- integer used as OFFSET
jbe@23 330 )
jbe@23 331
jbe@23 332 Skips a given number of rows, by using OFFSET. The selector is modified and returned.
jbe@23 333
jbe@23 334 --]]--
jbe/bsw@0 335 function selector_prototype:offset(count)
jbe/bsw@0 336 if type(count) ~= "number" or count % 1 ~= 0 then
jbe/bsw@0 337 error("OFFSET must be an integer.")
jbe/bsw@0 338 end
jbe/bsw@0 339 self._offset = count
jbe/bsw@0 340 return self
jbe/bsw@0 341 end
jbe@23 342 --//--
jbe/bsw@0 343
jbe@23 344 --[[--
jbe@23 345 db_selector = -- same selector returned
jbe@23 346 <db_selector>:for_share()
jbe@23 347
jbe@23 348 Adds FOR SHARE to the statement, to share-lock all rows read. The selector is modified and returned.
jbe@23 349
jbe@23 350 --]]--
jbe/bsw@4 351 function selector_prototype:for_share()
jbe/bsw@4 352 self._read_lock.all = true
jbe/bsw@4 353 return self
jbe/bsw@4 354 end
jbe@23 355 --//--
jbe/bsw@4 356
jbe@23 357 --[[--
jbe@23 358 db_selector = -- same selector returned
jbe@23 359 <db_selector>:for_share_of(
jbe@23 360 expression -- expression as passed to "assemble_command"
jbe@23 361 )
jbe@23 362
jbe@23 363 Adds FOR SHARE OF to the statement, to share-lock all rows read by the named table(s). The selector is modified and returned.
jbe@23 364
jbe@23 365 --]]--
jbe/bsw@4 366 function selector_prototype:for_share_of(expression)
jbe/bsw@4 367 add(self._read_lock, expression)
jbe/bsw@4 368 return self
jbe/bsw@4 369 end
jbe@23 370 --//--
jbe/bsw@4 371
jbe@23 372 --[[--
jbe@23 373 db_selector = -- same selector returned
jbe@23 374 <db_selector>:for_update()
jbe@23 375
jbe@23 376 Adds FOR UPDATE to the statement, to exclusivly lock all rows read. The selector is modified and returned.
jbe@23 377
jbe@23 378 --]]--
jbe/bsw@4 379 function selector_prototype:for_update()
jbe/bsw@4 380 self._write_lock.all = true
jbe/bsw@4 381 return self
jbe/bsw@4 382 end
jbe@23 383 --//--
jbe/bsw@4 384
jbe@23 385 --[[--
jbe@23 386 db_selector = -- same selector returned
jbe@23 387 <db_selector>:for_update_of(
jbe@23 388 expression -- expression as passed to "assemble_command"
jbe@23 389 )
jbe@23 390
jbe@23 391 Adds FOR SHARE OF to the statement, to exclusivly lock all rows read by the named table(s). The selector is modified and returned.
jbe@23 392
jbe@23 393 --]]--
jbe/bsw@4 394 function selector_prototype:for_update_of(expression)
jbe/bsw@4 395 add(self._write_lock, expression)
jbe/bsw@4 396 return self
jbe/bsw@4 397 end
jbe@23 398 --//--
jbe/bsw@4 399
jbe@23 400 --[[--
jbe@23 401 db_selector = -- same selector returned
jbe@23 402 <db_selector>:reset_fields()
jbe@23 403
jbe@23 404 This method removes all fields added by method "add_field". The selector is modified and returned.
jbe@23 405
jbe@23 406 --]]--
jbe/bsw@0 407 function selector_prototype:reset_fields()
jbe/bsw@0 408 for idx in ipairs(self._fields) do
jbe/bsw@0 409 self._fields[idx] = nil
jbe/bsw@0 410 end
jbe/bsw@0 411 return self
jbe/bsw@0 412 end
jbe@23 413 --//--
jbe/bsw@0 414
jbe@23 415 --[[--
jbe@23 416 db_selector = -- same selector returned
jbe@23 417 <db_selector>:add_field(
jbe@23 418 expression, -- expression as passed to "assemble_command"
jbe@23 419 alias, -- optional alias expression as passed to "assemble_command"
jbe@23 420 option_list -- optional list of options (may contain strings "distinct" or "grouped")
jbe@23 421 )
jbe@23 422
jbe@23 423 Adds fields to the selector. The selector is modified and returned. The third argument can be a list of options. If option "distinct" is given, then "add_distinct_on" will be executed for the given field or alias. If option "grouped" is given, then "add_group_by" will be executed for the given field or alias.
jbe@23 424
jbe@23 425 --]]--
jbe/bsw@0 426 function selector_prototype:add_field(expression, alias, options)
jbe/bsw@0 427 if alias then
jbe/bsw@0 428 add(self._fields, {'$ AS "$"', {expression}, {alias}})
jbe/bsw@0 429 else
jbe/bsw@0 430 add(self._fields, expression)
jbe/bsw@0 431 end
jbe/bsw@0 432 if options then
jbe/bsw@0 433 for i, option in ipairs(options) do
jbe/bsw@0 434 if option == "distinct" then
jbe/bsw@0 435 if alias then
jbe/bsw@0 436 self:add_distinct_on('"' .. alias .. '"')
jbe/bsw@0 437 else
jbe/bsw@0 438 self:add_distinct_on(expression)
jbe/bsw@0 439 end
jbe/bsw@0 440 elseif option == "grouped" then
jbe/bsw@0 441 if alias then
jbe/bsw@0 442 self:add_group_by('"' .. alias .. '"')
jbe/bsw@0 443 else
jbe/bsw@0 444 self:add_group_by(expression)
jbe/bsw@0 445 end
jbe/bsw@0 446 else
jbe/bsw@0 447 error("Unknown option '" .. option .. "' to add_field method.")
jbe/bsw@0 448 end
jbe/bsw@0 449 end
jbe/bsw@0 450 end
jbe/bsw@0 451 return self
jbe/bsw@0 452 end
jbe@23 453 --//--
jbe/bsw@0 454
jbe@23 455 --[[--
jbe@23 456 db_selector = -- same selector returned
jbe@23 457 <db_selector>:join(
jbe@23 458 expression, -- expression as passed to "assemble_command"
jbe@23 459 alias, -- optional alias expression as passed to "assemble_command"
jbe@23 460 condition -- optional condition expression as passed to "assemble_command"
jbe@23 461 )
jbe@23 462
jbe@23 463 Adds expressions for FROM clause to the selector. The selector is modified and returned. If an additional condition is given, an INNER JOIN will be used, otherwise a CROSS JOIN.
jbe@23 464
jbe@23 465 This method is identical to "add_from".
jbe@23 466
jbe@23 467 --]]--
jbe/bsw@0 468 function selector_prototype:join(...) -- NOTE: alias for add_from
jbe/bsw@0 469 return self:add_from(...)
jbe/bsw@0 470 end
jbe@23 471 --//--
jbe/bsw@0 472
jbe@23 473 --[[--
jbe@23 474 db_selector = -- same selector returned
jbe@23 475 <db_selector>:from(
jbe@23 476 expression, -- expression as passed to "assemble_command"
jbe@23 477 alias, -- optional alias expression as passed to "assemble_command"
jbe@23 478 condition -- optional condition expression as passed to "assemble_command"
jbe@23 479 )
jbe@23 480
jbe@23 481 Adds the first expression for FROM clause to the selector. The selector is modified and returned. If an additional condition is given, an INNER JOIN will be used, otherwise a CROSS JOIN.
jbe@23 482
jbe@23 483 This method is identical to "add_from" or "join", except that an error is thrown, if there is already any FROM expression existent.
jbe@23 484
jbe@23 485 --]]--
jbe/bsw@0 486 function selector_prototype:from(expression, alias, condition)
jbe/bsw@0 487 if #self._from > 0 then
jbe/bsw@0 488 error("From-clause already existing (hint: try join).")
jbe/bsw@0 489 end
jbe/bsw@0 490 return self:join(expression, alias, condition)
jbe/bsw@0 491 end
jbe@23 492 --//--
jbe/bsw@0 493
jbe@23 494 --[[--
jbe@23 495 db_selector = -- same selector returned
jbe@23 496 <db_selector>:left_join(
jbe@23 497 expression, -- expression as passed to "assemble_command"
jbe@23 498 alias, -- optional alias expression as passed to "assemble_command"
jbe@23 499 condition -- optional condition expression as passed to "assemble_command"
jbe@23 500 )
jbe@23 501
jbe@23 502 Adds expressions for FROM clause to the selector using a LEFT OUTER JOIN. The selector is modified and returned.
jbe@23 503
jbe@23 504 --]]--
jbe/bsw@0 505 function selector_prototype:left_join(expression, alias, condition)
jbe/bsw@0 506 local first = (#self._from == 0)
jbe/bsw@0 507 if not first then
jbe/bsw@0 508 add(self._from, "LEFT OUTER JOIN")
jbe/bsw@0 509 end
jbe/bsw@0 510 if alias then
jbe/bsw@0 511 add(self._from, {'$ AS "$"', {expression}, {alias}})
jbe/bsw@0 512 else
jbe/bsw@0 513 add(self._from, expression)
jbe/bsw@0 514 end
jbe/bsw@0 515 if condition then
jbe/bsw@0 516 if first then
jbe@55 517 self:add_where(condition)
jbe/bsw@0 518 else
jbe/bsw@0 519 add(self._from, "ON")
jbe/bsw@0 520 add(self._from, condition)
jbe/bsw@0 521 end
jbe/bsw@0 522 end
jbe/bsw@0 523 return self
jbe/bsw@0 524 end
jbe@23 525 --//--
jbe/bsw@0 526
jbe@23 527 --[[--
jbe@23 528 db_selector = -- same selector returned
jbe@23 529 <db_selector>:union(
jbe@23 530 expression -- expression or selector without ORDER BY, LIMIT, FOR UPDATE or FOR SHARE
jbe@23 531 )
jbe@23 532
jbe@23 533 This method adds an UNION clause to the given selector. The selector is modified and returned. The selector (or expression) passed as argument to this function shall not contain any ORDER BY, LIMIT, FOR UPDATE or FOR SHARE clauses.
jbe@23 534
jbe@23 535 --]]--
jbe/bsw@0 536 function selector_prototype:union(expression)
jbe/bsw@0 537 self:add_combine{"UNION $", {expression}}
jbe/bsw@0 538 return self
jbe/bsw@0 539 end
jbe@23 540 --//--
jbe/bsw@0 541
jbe@23 542 --[[--
jbe@23 543 db_selector = -- same selector returned
jbe@23 544 <db_selector>:union_all(
jbe@23 545 expression -- expression or selector without ORDER BY, LIMIT, FOR UPDATE or FOR SHARE
jbe@23 546 )
jbe@23 547
jbe@23 548 This method adds an UNION ALL clause to the given selector. The selector is modified and returned. The selector (or expression) passed as argument to this function shall not contain any ORDER BY, LIMIT, FOR UPDATE or FOR SHARE clauses.
jbe@23 549
jbe@23 550 --]]--
jbe/bsw@0 551 function selector_prototype:union_all(expression)
jbe/bsw@0 552 self:add_combine{"UNION ALL $", {expression}}
jbe/bsw@0 553 return self
jbe/bsw@0 554 end
jbe@23 555 --//--
jbe/bsw@0 556
jbe@23 557 --[[--
jbe@23 558 db_selector = -- same selector returned
jbe@23 559 <db_selector>:intersect(
jbe@23 560 expression -- expression or selector without ORDER BY, LIMIT, FOR UPDATE or FOR SHARE
jbe@23 561 )
jbe@23 562
jbe@23 563 This method adds an INTERSECT clause to the given selector. The selector is modified and returned. The selector (or expression) passed as argument to this function shall not contain any ORDER BY, LIMIT, FOR UPDATE or FOR SHARE clauses.
jbe@23 564
jbe@23 565 --]]--
jbe/bsw@0 566 function selector_prototype:intersect(expression)
jbe/bsw@0 567 self:add_combine{"INTERSECT $", {expression}}
jbe/bsw@0 568 return self
jbe/bsw@0 569 end
jbe@23 570 --//--
jbe/bsw@0 571
jbe@23 572 --[[--
jbe@23 573 db_selector = -- same selector returned
jbe@23 574 <db_selector>:intersect_all(
jbe@23 575 expression -- expression or selector without ORDER BY, LIMIT, FOR UPDATE or FOR SHARE
jbe@23 576 )
jbe@23 577
jbe@23 578 This method adds an INTERSECT ALL clause to the given selector. The selector is modified and returned. The selector (or expression) passed as argument to this function shall not contain any ORDER BY, LIMIT, FOR UPDATE or FOR SHARE clauses.
jbe@23 579
jbe@23 580 --]]--
jbe/bsw@0 581 function selector_prototype:intersect_all(expression)
jbe/bsw@0 582 self:add_combine{"INTERSECT ALL $", {expression}}
jbe/bsw@0 583 return self
jbe/bsw@0 584 end
jbe@23 585 --//--
jbe/bsw@0 586
jbe@23 587 --[[--
jbe@23 588 db_selector = -- same selector returned
jbe@23 589 <db_selector>:except(
jbe@23 590 expression -- expression or selector without ORDER BY, LIMIT, FOR UPDATE or FOR SHARE
jbe@23 591 )
jbe@23 592
jbe@23 593 This method adds an EXCEPT clause to the given selector. The selector is modified and returned. The selector (or expression) passed as argument to this function shall not contain any ORDER BY, LIMIT, FOR UPDATE or FOR SHARE clauses.
jbe@23 594
jbe@23 595 --]]--
jbe/bsw@0 596 function selector_prototype:except(expression)
jbe/bsw@0 597 self:add_combine{"EXCEPT $", {expression}}
jbe/bsw@0 598 return self
jbe/bsw@0 599 end
jbe@23 600 --//--
jbe/bsw@0 601
jbe@23 602 --[[--
jbe@23 603 db_selector = -- same selector returned
jbe@23 604 <db_selector>:except_all(
jbe@23 605 expression -- expression or selector without ORDER BY, LIMIT, FOR UPDATE or FOR SHARE
jbe@23 606 )
jbe@23 607
jbe@23 608 This method adds an EXCEPT ALL clause to the given selector. The selector is modified and returned. The selector (or expression) passed as argument to this function shall not contain any ORDER BY, LIMIT, FOR UPDATE or FOR SHARE clauses.
jbe@23 609
jbe@23 610 --]]--
jbe/bsw@0 611 function selector_prototype:except_all(expression)
jbe/bsw@0 612 self:add_combine{"EXCEPT ALL $", {expression}}
jbe/bsw@0 613 return self
jbe/bsw@0 614 end
jbe@23 615 --//--
jbe/bsw@0 616
jbe@23 617 --[[--
jbe@23 618 db_selector = -- same selector returned
jbe@23 619 <db_selector>:set_class(
jbe@23 620 class -- database class (model)
jbe@23 621 )
jbe@23 622
jbe@23 623 This method makes the selector to return database result lists or objects of the given database class (model). The selector is modified and returned.
jbe@23 624
jbe@23 625 --]]--
jbe/bsw@0 626 function selector_prototype:set_class(class)
jbe/bsw@0 627 self._class = class
jbe/bsw@0 628 return self
jbe/bsw@0 629 end
jbe@23 630 --//--
jbe/bsw@0 631
jbe@23 632 --[[--
jbe@23 633 db_selector = -- same selector returned
jbe@23 634 <db_selector>:attach(
jbe@23 635 mode, -- attachment type: "11" one to one, "1m" one to many, "m1" many to one
jbe@23 636 data2, -- other database result list or object, the results of this selector shall be attached with
jbe@23 637 field1, -- field name(s) in result list or object of this selector used for attaching
jbe@23 638 field2, -- field name(s) in "data2" used for attaching
jbe@23 639 ref1, -- name of reference field in the results of this selector after attaching
jbe@23 640 ref2 -- name of reference field in "data2" after attaching
jbe@23 641 )
jbe@23 642
jbe@23 643 This method causes database result lists or objects of this selector to be attached with other database result lists after execution. This method does not need to be called directly.
jbe@23 644
jbe@23 645 --]]--
jbe/bsw@0 646 function selector_prototype:attach(mode, data2, field1, field2, ref1, ref2)
jbe/bsw@0 647 self._attach = {
jbe/bsw@0 648 mode = mode,
jbe/bsw@0 649 data2 = data2,
jbe/bsw@0 650 field1 = field1,
jbe/bsw@0 651 field2 = field2,
jbe/bsw@0 652 ref1 = ref1,
jbe/bsw@0 653 ref2 = ref2
jbe/bsw@0 654 }
jbe/bsw@0 655 return self
jbe/bsw@0 656 end
jbe@23 657 --//--
jbe/bsw@0 658
jbe/bsw@0 659 function selector_metatable:__tostring()
jbe/bsw@0 660 local parts = {sep = " "}
jbe@39 661 if #self._with > 0 then
jbe@39 662 add(parts, {"WITH RECURSIVE $", self._with})
jbe@39 663 end
jbe/bsw@0 664 add(parts, "SELECT")
jbe/bsw@0 665 if self._distinct then
jbe/bsw@0 666 add(parts, "DISTINCT")
jbe/bsw@0 667 elseif #self._distinct_on > 0 then
jbe/bsw@0 668 add(parts, {"DISTINCT ON ($)", self._distinct_on})
jbe/bsw@0 669 end
jbe/bsw@0 670 add(parts, {"$", self._fields})
jbe/bsw@0 671 if #self._from > 0 then
jbe/bsw@0 672 add(parts, {"FROM $", self._from})
jbe/bsw@0 673 end
jbe/bsw@0 674 if #self._mode == "empty_list" then
jbe/bsw@0 675 add(parts, "WHERE FALSE")
jbe/bsw@0 676 elseif #self._where > 0 then
jbe/bsw@4 677 add(parts, {"WHERE ($)", self._where})
jbe/bsw@0 678 end
jbe/bsw@0 679 if #self._group_by > 0 then
jbe/bsw@0 680 add(parts, {"GROUP BY $", self._group_by})
jbe/bsw@0 681 end
jbe/bsw@0 682 if #self._having > 0 then
jbe/bsw@4 683 add(parts, {"HAVING ($)", self._having})
jbe/bsw@0 684 end
jbe/bsw@0 685 for i, v in ipairs(self._combine) do
jbe/bsw@0 686 add(parts, v)
jbe/bsw@0 687 end
jbe/bsw@0 688 if #self._order_by > 0 then
jbe/bsw@0 689 add(parts, {"ORDER BY $", self._order_by})
jbe/bsw@0 690 end
jbe/bsw@0 691 if self._mode == "empty_list" then
jbe/bsw@0 692 add(parts, "LIMIT 0")
jbe/bsw@0 693 elseif self._mode ~= "list" then
jbe/bsw@0 694 add(parts, "LIMIT 1")
jbe/bsw@0 695 elseif self._limit then
jbe/bsw@0 696 add(parts, "LIMIT " .. self._limit)
jbe/bsw@0 697 end
jbe/bsw@0 698 if self._offset then
jbe/bsw@0 699 add(parts, "OFFSET " .. self._offset)
jbe/bsw@0 700 end
jbe/bsw@4 701 if self._write_lock.all then
jbe/bsw@4 702 add(parts, "FOR UPDATE")
jbe/bsw@4 703 else
jbe/bsw@4 704 if self._read_lock.all then
jbe/bsw@4 705 add(parts, "FOR SHARE")
jbe/bsw@4 706 elseif #self._read_lock > 0 then
jbe/bsw@4 707 add(parts, {"FOR SHARE OF $", self._read_lock})
jbe/bsw@4 708 end
jbe/bsw@4 709 if #self._write_lock > 0 then
jbe/bsw@4 710 add(parts, {"FOR UPDATE OF $", self._write_lock})
jbe/bsw@4 711 end
jbe/bsw@4 712 end
jbe/bsw@0 713 return self._db_conn:assemble_command{"$", parts}
jbe/bsw@0 714 end
jbe/bsw@0 715
jbe@23 716 --[[--
jbe@23 717 db_error, -- database error object, or nil in case of success
jbe@23 718 result = -- database result list or object
jbe@23 719 <db_selector>:try_exec()
jbe@23 720
jbe@23 721 This method executes the selector on its database. First return value is an error object or nil in case of success. Second return value is the result list or object.
jbe@23 722
jbe@23 723 --]]--
jbe/bsw@0 724 function selector_prototype:try_exec()
jbe/bsw@0 725 if self._mode == "empty_list" then
jbe/bsw@0 726 if self._class then
jbe/bsw@0 727 return nil, self._class:create_list()
jbe/bsw@0 728 else
jbe/bsw@0 729 return nil, self._db_conn:create_list()
jbe/bsw@0 730 end
jbe/bsw@0 731 end
jbe/bsw@0 732 local db_error, db_result = self._db_conn:try_query(self, self._mode)
jbe/bsw@0 733 if db_error then
jbe/bsw@0 734 return db_error
jbe/bsw@0 735 elseif db_result then
jbe/bsw@0 736 if self._class then set_class(db_result, self._class) end
jbe/bsw@0 737 if self._attach then
jbe/bsw@0 738 attach(
jbe/bsw@0 739 self._attach.mode,
jbe/bsw@0 740 db_result,
jbe/bsw@0 741 self._attach.data2,
jbe/bsw@0 742 self._attach.field1,
jbe/bsw@0 743 self._attach.field2,
jbe/bsw@0 744 self._attach.ref1,
jbe/bsw@0 745 self._attach.ref2
jbe/bsw@0 746 )
jbe/bsw@0 747 end
jbe/bsw@0 748 return nil, db_result
jbe/bsw@0 749 else
jbe/bsw@0 750 return nil
jbe/bsw@0 751 end
jbe/bsw@0 752 end
jbe@23 753 --//--
jbe/bsw@0 754
jbe@23 755 --[[--
jbe@23 756 result = -- database result list or object
jbe@23 757 <db_selector>:exec()
jbe@23 758
jbe@23 759 This method executes the selector on its database. The result list or object is returned on success, otherwise an error is thrown.
jbe@23 760
jbe@23 761 --]]--
jbe/bsw@0 762 function selector_prototype:exec()
jbe/bsw@0 763 local db_error, result = self:try_exec()
jbe/bsw@0 764 if db_error then
jbe/bsw@0 765 db_error:escalate()
jbe/bsw@0 766 else
jbe/bsw@0 767 return result
jbe/bsw@0 768 end
jbe/bsw@0 769 end
jbe@23 770 --//--
jbe/bsw@0 771
jbe@23 772 --[[--
jbe@23 773 count = -- number of rows returned
jbe@23 774 <db_selector>:count()
jbe@23 775
jbe@23 776 This function wraps the given selector inside a subquery to count the number of rows returned by the database. NOTE: The result is cached inside the selector, thus the selector should NOT be modified afterwards.
jbe@23 777
jbe@23 778 --]]--
jbe/bsw@4 779 function selector_prototype:count()
jbe/bsw@4 780 if not self._count then
jbe/bsw@4 781 local count_selector = self:get_db_conn():new_selector()
jbe/bsw@4 782 count_selector:add_field('count(1)')
jbe/bsw@4 783 count_selector:add_from(self)
jbe/bsw@4 784 count_selector:single_object_mode()
jbe/bsw@4 785 self._count = count_selector:exec().count
jbe/bsw@4 786 end
jbe/bsw@4 787 return self._count
jbe/bsw@4 788 end
jbe@23 789 --//--
jbe/bsw@4 790
jbe/bsw@0 791
jbe/bsw@0 792
jbe/bsw@0 793 -----------------
jbe/bsw@0 794 -- attachments --
jbe/bsw@0 795 -----------------
jbe/bsw@0 796
jbe/bsw@0 797 local function attach_key(row, fields)
jbe/bsw@0 798 local t = type(fields)
jbe/bsw@0 799 if t == "string" then
jbe/bsw@0 800 return tostring(row[fields])
jbe/bsw@0 801 elseif t == "table" then
jbe/bsw@0 802 local r = {}
jbe/bsw@0 803 for idx, field in ipairs(fields) do
jbe/bsw@0 804 r[idx] = string.format("%q", row[field])
jbe/bsw@0 805 end
jbe/bsw@0 806 return table.concat(r)
jbe/bsw@0 807 else
jbe/bsw@0 808 error("Field information for 'mondelefant.attach' is neither a string nor a table.")
jbe/bsw@0 809 end
jbe/bsw@0 810 end
jbe/bsw@0 811
jbe@23 812 --[[--
jbe@23 813 mondelefant.attach(
jbe@23 814 mode, -- attachment type: "11" one to one, "1m" one to many, "m1" many to one
jbe@23 815 data1, -- first database result list or object
jbe@23 816 data2, -- second database result list or object
jbe@23 817 key1, -- field name(s) in first result list or object used for attaching
jbe@23 818 key2, -- field name(s) in second result list or object used for attaching
jbe@23 819 ref1, -- name of reference field to be set in first database result list or object
jbe@23 820 ref2 -- name of reference field to be set in second database result list or object
jbe@23 821 )
jbe@23 822
jbe@23 823 This function attaches database result lists/objects with each other. It does not need to be called directly.
jbe@23 824
jbe@23 825 --]]--
jbe/bsw@0 826 function attach(mode, data1, data2, key1, key2, ref1, ref2)
jbe/bsw@0 827 local many1, many2
jbe/bsw@0 828 if mode == "11" then
jbe/bsw@0 829 many1 = false
jbe/bsw@0 830 many2 = false
jbe/bsw@0 831 elseif mode == "1m" then
jbe/bsw@0 832 many1 = false
jbe/bsw@0 833 many2 = true
jbe/bsw@0 834 elseif mode == "m1" then
jbe/bsw@0 835 many1 = true
jbe/bsw@0 836 many2 = false
jbe/bsw@0 837 elseif mode == "mm" then
jbe/bsw@0 838 many1 = true
jbe/bsw@0 839 many2 = true
jbe/bsw@0 840 else
jbe/bsw@0 841 error("Unknown mode specified for 'mondelefant.attach'.")
jbe/bsw@0 842 end
jbe/bsw@0 843 local list1, list2
jbe/bsw@0 844 if data1._type == "object" then
jbe/bsw@0 845 list1 = { data1 }
jbe/bsw@0 846 elseif data1._type == "list" then
jbe/bsw@0 847 list1 = data1
jbe/bsw@0 848 else
jbe/bsw@0 849 error("First result data given to 'mondelefant.attach' is invalid.")
jbe/bsw@0 850 end
jbe/bsw@0 851 if data2._type == "object" then
jbe/bsw@0 852 list2 = { data2 }
jbe/bsw@0 853 elseif data2._type == "list" then
jbe/bsw@0 854 list2 = data2
jbe/bsw@0 855 else
jbe/bsw@0 856 error("Second result data given to 'mondelefant.attach' is invalid.")
jbe/bsw@0 857 end
jbe/bsw@0 858 local hash1 = {}
jbe/bsw@0 859 local hash2 = {}
jbe/bsw@0 860 if ref2 then
jbe/bsw@0 861 for i, row in ipairs(list1) do
jbe/bsw@0 862 local key = attach_key(row, key1)
jbe/bsw@0 863 local list = hash1[key]
jbe/bsw@0 864 if not list then list = {}; hash1[key] = list end
jbe/bsw@0 865 list[#list + 1] = row
jbe/bsw@0 866 end
jbe/bsw@0 867 end
jbe/bsw@0 868 if ref1 then
jbe/bsw@0 869 for i, row in ipairs(list2) do
jbe/bsw@0 870 local key = attach_key(row, key2)
jbe/bsw@0 871 local list = hash2[key]
jbe/bsw@0 872 if not list then list = {}; hash2[key] = list end
jbe/bsw@0 873 list[#list + 1] = row
jbe/bsw@0 874 end
jbe/bsw@0 875 for i, row in ipairs(list1) do
jbe/bsw@0 876 local key = attach_key(row, key1)
jbe/bsw@0 877 local matching_rows = hash2[key]
jbe/bsw@0 878 if many2 then
jbe/bsw@0 879 local list = data2._connection:create_list(matching_rows)
jbe/bsw@0 880 list._class = data2._class
jbe/bsw@0 881 row._ref[ref1] = list
jbe/bsw@0 882 elseif matching_rows and #matching_rows == 1 then
jbe/bsw@0 883 row._ref[ref1] = matching_rows[1]
jbe/bsw@0 884 else
jbe/bsw@0 885 row._ref[ref1] = false
jbe/bsw@0 886 end
jbe/bsw@0 887 end
jbe/bsw@0 888 end
jbe/bsw@0 889 if ref2 then
jbe/bsw@0 890 for i, row in ipairs(list2) do
jbe/bsw@0 891 local key = attach_key(row, key2)
jbe/bsw@0 892 local matching_rows = hash1[key]
jbe/bsw@0 893 if many1 then
jbe/bsw@0 894 local list = data1._connection:create_list(matching_rows)
jbe/bsw@0 895 list._class = data1._class
jbe/bsw@0 896 row._ref[ref2] = list
jbe/bsw@0 897 elseif matching_rows and #matching_rows == 1 then
jbe/bsw@0 898 row._ref[ref2] = matching_rows[1]
jbe/bsw@0 899 else
jbe/bsw@0 900 row._ref[ref2] = false
jbe/bsw@0 901 end
jbe/bsw@0 902 end
jbe/bsw@0 903 end
jbe/bsw@0 904 end
jbe@23 905 --//--
jbe/bsw@0 906
jbe/bsw@0 907
jbe/bsw@0 908
jbe/bsw@0 909 ------------------
jbe/bsw@0 910 -- model system --
jbe/bsw@0 911 ------------------
jbe/bsw@0 912
jbe@23 913 --[[--
jbe@23 914 <db_class>.primary_key
jbe@23 915
jbe@23 916 Primary key of a database class (model). Defaults to "id".
jbe@23 917
jbe@23 918 --]]--
jbe/bsw@0 919 class_prototype.primary_key = "id"
jbe@23 920 --//--
jbe/bsw@0 921
jbe@23 922 --[[--
jbe@23 923 db_handle = -- database connection handle used by this class
jbe@23 924 <db_class>:get_db_conn()
jbe@23 925
jbe@23 926 By implementing this method for a particular model or overwriting it in the default prototype "mondelefant.class_prototype", classes are connected with a particular database. This method needs to return a database connection handle. If it is not overwritten, an error is thrown, when invoking this method.
jbe@23 927
jbe@23 928 --]]--
jbe/bsw@0 929 function class_prototype:get_db_conn()
jbe/bsw@0 930 error(
jbe/bsw@0 931 "Method mondelefant class(_prototype):get_db_conn() " ..
jbe/bsw@0 932 "has to be implemented."
jbe/bsw@0 933 )
jbe/bsw@0 934 end
jbe@23 935 --//--
jbe/bsw@0 936
jbe@23 937 --[[--
jbe@23 938 string = -- string of form '"schemaname"."tablename"' or '"tablename"'
jbe@23 939 <db_class>:get_qualified_table()
jbe@23 940
jbe@23 941 This method returns a string with the (double quoted) qualified table name used to store objects of this class.
jbe@23 942
jbe@23 943 --]]--
jbe/bsw@0 944 function class_prototype:get_qualified_table()
jbe/bsw@0 945 if not self.table then error "Table unknown." end
jbe/bsw@0 946 if self.schema then
jbe/bsw@0 947 return '"' .. self.schema .. '"."' .. self.table .. '"'
jbe/bsw@0 948 else
jbe/bsw@0 949 return '"' .. self.table .. '"'
jbe/bsw@0 950 end
jbe/bsw@0 951 end
jbe@23 952 --]]--
jbe/bsw@0 953
jbe@23 954 --[[--
jbe@23 955 string = -- single quoted string of form "'schemaname.tablename'" or "'tablename'"
jbe@23 956 <db_class>:get_qualified_table_literal()
jbe@23 957
jbe@23 958 This method returns a string with an SQL literal representing the given table. It causes ambiguities when the table name contains a dot (".") character.
jbe@23 959
jbe@23 960 --]]--
jbe/bsw@0 961 function class_prototype:get_qualified_table_literal()
jbe/bsw@0 962 if not self.table then error "Table unknown." end
jbe/bsw@0 963 if self.schema then
jbe/bsw@0 964 return self.schema .. '.' .. self.table
jbe/bsw@0 965 else
jbe/bsw@0 966 return self.table
jbe/bsw@0 967 end
jbe/bsw@0 968 end
jbe@23 969 --//--
jbe/bsw@0 970
jbe@23 971 --[[--
jbe@23 972 list = -- list of column names of primary key
jbe@23 973 <db_class>:get_primary_key_list()
jbe@23 974
jbe@23 975 This method returns a list of column names of the primary key.
jbe@23 976
jbe@23 977 --]]--
jbe/bsw@0 978 function class_prototype:get_primary_key_list()
jbe/bsw@0 979 local primary_key = self.primary_key
jbe/bsw@0 980 if type(primary_key) == "string" then
jbe/bsw@0 981 return {primary_key}
jbe/bsw@0 982 else
jbe/bsw@0 983 return primary_key
jbe/bsw@0 984 end
jbe/bsw@0 985 end
jbe@23 986 --//--
jbe/bsw@0 987
jbe@23 988 --[[--
jbe@23 989 columns = -- list of columns
jbe@23 990 <db_class>:get_columns()
jbe@23 991
jbe@23 992 This method returns a list of column names of the table used for the class.
jbe@23 993
jbe@23 994 --]]--
jbe/bsw@0 995 function class_prototype:get_columns()
jbe/bsw@0 996 if self._columns then
jbe/bsw@0 997 return self._columns
jbe/bsw@0 998 end
jbe/bsw@0 999 local selector = self:get_db_conn():new_selector()
jbe/bsw@0 1000 selector:set_class(self)
jbe/bsw@0 1001 selector:from(self:get_qualified_table())
jbe/bsw@0 1002 selector:add_field("*")
jbe/bsw@0 1003 selector:add_where("FALSE")
jbe/bsw@0 1004 local db_result = selector:exec()
jbe/bsw@0 1005 local connection = db_result._connection
jbe/bsw@0 1006 local columns = {}
jbe/bsw@0 1007 for idx, info in ipairs(db_result._column_info) do
jbe/bsw@0 1008 local key = info.field_name
jbe/bsw@0 1009 local value = {
jbe/bsw@0 1010 name = key,
jbe/bsw@0 1011 type = connection.type_mappings[info.type]
jbe/bsw@0 1012 }
jbe/bsw@0 1013 columns[key] = value
jbe/bsw@0 1014 table.insert(columns, value)
jbe/bsw@0 1015 end
jbe/bsw@0 1016 self._columns = columns
jbe/bsw@0 1017 return columns
jbe/bsw@0 1018 end
jbe@25 1019 --//--
jbe/bsw@0 1020
jbe@23 1021 --[[--
jbe@23 1022 selector = -- new selector for selecting objects of this class
jbe@23 1023 <db_class>:new_selector(
jbe@23 1024 db_conn -- optional(!) database connection handle, defaults to result of :get_db_conn()
jbe@23 1025 )
jbe@23 1026
jbe@23 1027 This method creates a new selector for selecting objects of the class.
jbe@23 1028
jbe@23 1029 --]]--
jbe/bsw@0 1030 function class_prototype:new_selector(db_conn)
jbe/bsw@0 1031 local selector = (db_conn or self:get_db_conn()):new_selector()
jbe/bsw@0 1032 selector:set_class(self)
jbe/bsw@0 1033 selector:from(self:get_qualified_table())
jbe/bsw@0 1034 selector:add_field(self:get_qualified_table() .. ".*")
jbe/bsw@0 1035 return selector
jbe/bsw@0 1036 end
jbe@23 1037 --//--
jbe/bsw@0 1038
jbe@23 1039 --[[--
jbe@23 1040 db_list = -- database result being an empty list
jbe@23 1041 <db_class>:create_list()
jbe@23 1042
jbe@23 1043 Creates an empty database result representing a list of objects of the given class.
jbe@23 1044
jbe@23 1045 --]]--
jbe/bsw@0 1046 function class_prototype:create_list()
jbe/bsw@0 1047 local list = self:get_db_conn():create_list()
jbe/bsw@0 1048 list._class = self
jbe/bsw@0 1049 return list
jbe/bsw@0 1050 end
jbe@23 1051 --//--
jbe/bsw@0 1052
jbe@23 1053 --[[--
jbe@23 1054 db_object = -- database object (instance of model)
jbe@23 1055 <db_class>:new()
jbe@23 1056
jbe@23 1057 Creates a new object of the given class.
jbe@23 1058
jbe@23 1059 --]]--
jbe/bsw@0 1060 function class_prototype:new()
jbe/bsw@0 1061 local object = self:get_db_conn():create_object()
jbe/bsw@0 1062 object._class = self
jbe/bsw@0 1063 object._new = true
jbe/bsw@0 1064 return object
jbe/bsw@0 1065 end
jbe@23 1066 --//--
jbe/bsw@0 1067
jbe@23 1068 --[[--
jbe@23 1069 db_error = -- database error object, or nil in case of success
jbe@23 1070 <db_object>:try_save()
jbe@23 1071
jbe@23 1072 This method saves changes to an object in the database. Returns nil on success, otherwise an error object is returned.
jbe@23 1073
jbe@23 1074 --]]--
jbe/bsw@0 1075 function class_prototype.object:try_save()
jbe/bsw@0 1076 if not self._class then
jbe/bsw@0 1077 error("Cannot save object: No class information available.")
jbe/bsw@0 1078 end
jbe/bsw@0 1079 local primary_key = self._class:get_primary_key_list()
jbe/bsw@0 1080 local primary_key_sql = { sep = ", " }
jbe/bsw@0 1081 for idx, value in ipairs(primary_key) do
jbe/bsw@0 1082 primary_key_sql[idx] = '"' .. value .. '"'
jbe/bsw@0 1083 end
jbe/bsw@0 1084 if self._new then
jbe/bsw@0 1085 local fields = {sep = ", "}
jbe/bsw@0 1086 local values = {sep = ", "}
jbe/bsw@0 1087 for key, dummy in pairs(self._dirty or {}) do
jbe/bsw@0 1088 add(fields, {'"$"', {key}})
jbe/bsw@0 1089 add(values, {'?', self[key]})
jbe/bsw@0 1090 end
jbe/bsw@0 1091 if compat_returning then -- compatibility for PostgreSQL 8.1
jbe/bsw@0 1092 local db_error, db_result1, db_result2 = self._connection:try_query(
jbe/bsw@0 1093 {
jbe/bsw@0 1094 'INSERT INTO $ ($) VALUES ($)',
jbe/bsw@0 1095 {self._class:get_qualified_table()},
jbe/bsw@0 1096 fields,
jbe/bsw@0 1097 values,
jbe/bsw@0 1098 primary_key_sql
jbe/bsw@0 1099 },
jbe/bsw@0 1100 "list",
jbe/bsw@0 1101 {
jbe/bsw@0 1102 'SELECT currval(?)',
jbe/bsw@0 1103 self._class.table .. '_id_seq'
jbe/bsw@0 1104 },
jbe/bsw@0 1105 "object"
jbe/bsw@0 1106 )
jbe/bsw@0 1107 if db_error then
jbe/bsw@0 1108 return db_error
jbe/bsw@0 1109 end
jbe/bsw@0 1110 self.id = db_result2.id
jbe/bsw@0 1111 else
jbe@51 1112 local db_error, db_result
jbe@51 1113 if #fields == 0 then
jbe@51 1114 db_error, db_result = self._connection:try_query(
jbe@51 1115 {
jbe@51 1116 'INSERT INTO $ DEFAULT VALUES RETURNING ($)',
jbe@51 1117 {self._class:get_qualified_table()},
jbe@51 1118 primary_key_sql
jbe@51 1119 },
jbe@51 1120 "object"
jbe@51 1121 )
jbe@51 1122 else
jbe@51 1123 db_error, db_result = self._connection:try_query(
jbe@51 1124 {
jbe@51 1125 'INSERT INTO $ ($) VALUES ($) RETURNING ($)',
jbe@51 1126 {self._class:get_qualified_table()},
jbe@51 1127 fields,
jbe@51 1128 values,
jbe@51 1129 primary_key_sql
jbe@51 1130 },
jbe@51 1131 "object"
jbe@51 1132 )
jbe@51 1133 end
jbe/bsw@0 1134 if db_error then
jbe/bsw@0 1135 return db_error
jbe/bsw@0 1136 end
jbe/bsw@0 1137 for idx, value in ipairs(primary_key) do
jbe/bsw@0 1138 self[value] = db_result[value]
jbe/bsw@0 1139 end
jbe/bsw@0 1140 end
jbe/bsw@0 1141 self._new = false
jbe/bsw@0 1142 else
jbe/bsw@0 1143 local command_sets = {sep = ", "}
jbe/bsw@0 1144 for key, dummy in pairs(self._dirty or {}) do
jbe/bsw@0 1145 add(command_sets, {'"$" = ?', {key}, self[key]})
jbe/bsw@0 1146 end
jbe/bsw@0 1147 if #command_sets >= 1 then
jbe/bsw@0 1148 local primary_key_compare = {sep = " AND "}
jbe/bsw@0 1149 for idx, value in ipairs(primary_key) do
jbe/bsw@0 1150 primary_key_compare[idx] = {
jbe/bsw@0 1151 "$ = ?",
jbe/bsw@0 1152 {'"' .. value .. '"'},
jbe/bsw@0 1153 self[value]
jbe/bsw@0 1154 }
jbe/bsw@0 1155 end
jbe/bsw@0 1156 local db_error = self._connection:try_query{
jbe/bsw@0 1157 'UPDATE $ SET $ WHERE $',
jbe/bsw@0 1158 {self._class:get_qualified_table()},
jbe/bsw@0 1159 command_sets,
jbe/bsw@0 1160 primary_key_compare
jbe/bsw@0 1161 }
jbe/bsw@0 1162 if db_error then
jbe/bsw@0 1163 return db_error
jbe/bsw@0 1164 end
jbe/bsw@0 1165 end
jbe/bsw@0 1166 end
jbe/bsw@0 1167 return nil
jbe/bsw@0 1168 end
jbe@23 1169 --//--
jbe/bsw@0 1170
jbe@23 1171 --[[--
jbe@23 1172 <db_object>:save()
jbe@23 1173
jbe@23 1174 This method saves changes to an object in the database. Throws error, unless successful.
jbe@23 1175
jbe@23 1176 --]]--
jbe/bsw@0 1177 function class_prototype.object:save()
jbe/bsw@0 1178 local db_error = self:try_save()
jbe/bsw@0 1179 if db_error then
jbe/bsw@0 1180 db_error:escalate()
jbe/bsw@0 1181 end
jbe/bsw@0 1182 return self
jbe/bsw@0 1183 end
jbe@23 1184 --//--
jbe/bsw@0 1185
jbe@23 1186 --[[--
jbe@23 1187 db_error = -- database error object, or nil in case of success
jbe@23 1188 <db_object>:try_destroy()
jbe@23 1189
jbe@23 1190 This method deletes an object in the database. Returns nil on success, otherwise an error object is returned.
jbe@23 1191
jbe@23 1192 --]]--
jbe/bsw@0 1193 function class_prototype.object:try_destroy()
jbe/bsw@0 1194 if not self._class then
jbe/bsw@0 1195 error("Cannot destroy object: No class information available.")
jbe/bsw@0 1196 end
jbe/bsw@0 1197 local primary_key = self._class:get_primary_key_list()
jbe/bsw@0 1198 local primary_key_compare = {sep = " AND "}
jbe/bsw@0 1199 for idx, value in ipairs(primary_key) do
jbe/bsw@0 1200 primary_key_compare[idx] = {
jbe/bsw@0 1201 "$ = ?",
jbe/bsw@0 1202 {'"' .. value .. '"'},
jbe/bsw@0 1203 self[value]
jbe/bsw@0 1204 }
jbe/bsw@0 1205 end
jbe/bsw@0 1206 return self._connection:try_query{
jbe/bsw@0 1207 'DELETE FROM $ WHERE $',
jbe/bsw@0 1208 {self._class:get_qualified_table()},
jbe/bsw@0 1209 primary_key_compare
jbe/bsw@0 1210 }
jbe/bsw@0 1211 end
jbe@23 1212 --//--
jbe/bsw@0 1213
jbe@23 1214 --[[--
jbe@23 1215 <db_object>:destroy()
jbe@23 1216
jbe@23 1217 This method deletes an object in the database. Throws error, unless successful.
jbe@23 1218
jbe@23 1219 --]]--
jbe/bsw@0 1220 function class_prototype.object:destroy()
jbe/bsw@0 1221 local db_error = self:try_destroy()
jbe/bsw@0 1222 if db_error then
jbe/bsw@0 1223 db_error:escalate()
jbe/bsw@0 1224 end
jbe/bsw@0 1225 return self
jbe/bsw@0 1226 end
jbe@23 1227 --//--
jbe/bsw@0 1228
jbe@23 1229 --[[--
jbe@23 1230 db_selector =
jbe@23 1231 <db_list>:get_reference_selector(
jbe@23 1232 ref_name, -- name of reference (e.g. "children")
jbe@23 1233 options, -- table options passed to the reference loader (e.g. { order = ... })
jbe@23 1234 ref_alias, -- optional alias for the reference (e.g. "ordered_children")
jbe@23 1235 back_ref_alias -- back reference name (e.g. "parent")
jbe@23 1236 )
jbe@23 1237
jbe@23 1238 This method returns a special selector for selecting referenced objects. It is prepared in a way, that on execution of the selector, all returned objects are attached with the objects of the existent list. The "ref" and "back_ref" arguments passed to "add_reference" are used for the attachment, unless aliases are given with "ref_alias" and "back_ref_alias". If "options" are set, these options are passed to the reference loader. The default reference loader supports only one option named "order". If "order" is set to nil, the default order is used, if "order" is set to false, no ORDER BY statment is included in the selector, otherwise the given expression is used for ordering.
jbe@23 1239
jbe@23 1240 This method is not only available for database result lists but also for database result objects.
jbe@23 1241
jbe@23 1242 --]]--
jbe/bsw@0 1243 function class_prototype.list:get_reference_selector(
jbe/bsw@0 1244 ref_name, options, ref_alias, back_ref_alias
jbe/bsw@0 1245 )
jbe/bsw@0 1246 local ref_info = self._class.references[ref_name]
jbe/bsw@0 1247 if not ref_info then
jbe/bsw@0 1248 error('Reference with name "' .. ref_name .. '" not found.')
jbe/bsw@0 1249 end
jbe/bsw@0 1250 local selector = ref_info.selector_generator(self, options or {})
jbe/bsw@0 1251 local mode = ref_info.mode
jbe/bsw@0 1252 if mode == "mm" or mode == "1m" then
jbe/bsw@0 1253 mode = "m1"
jbe/bsw@0 1254 elseif mode == "m1" then
jbe/bsw@0 1255 mode = "1m"
jbe/bsw@0 1256 end
jbe/bsw@0 1257 local ref_alias = ref_alias
jbe/bsw@0 1258 if ref_alias == false then
jbe/bsw@0 1259 ref_alias = nil
jbe/bsw@0 1260 elseif ref_alias == nil then
jbe/bsw@0 1261 ref_alias = ref_name
jbe/bsw@0 1262 end
jbe/bsw@0 1263 local back_ref_alias
jbe/bsw@0 1264 if back_ref_alias == false then
jbe/bsw@0 1265 back_ref_alias = nil
jbe/bsw@0 1266 elseif back_ref_alias == nil then
jbe/bsw@0 1267 back_ref_alias = ref_info.back_ref
jbe/bsw@0 1268 end
jbe/bsw@0 1269 selector:attach(
jbe/bsw@0 1270 mode,
jbe/bsw@0 1271 self,
jbe/bsw@0 1272 ref_info.that_key, ref_info.this_key,
jbe/bsw@0 1273 back_ref_alias or ref_info.back_ref, ref_alias or ref_name
jbe/bsw@0 1274 )
jbe/bsw@0 1275 return selector
jbe/bsw@0 1276 end
jbe@23 1277 --//--
jbe/bsw@0 1278
jbe@23 1279 --[[--
jbe@23 1280 db_list_or_object =
jbe@23 1281 <db_list>:load(
jbe@23 1282 ref_name, -- name of reference (e.g. "children")
jbe@23 1283 options, -- table options passed to the reference loader (e.g. { order = ... })
jbe@23 1284 ref_alias, -- optional alias for the reference (e.g. "ordered_children")
jbe@23 1285 back_ref_alias -- back reference name (e.g. "parent")
jbe@23 1286 )
jbe@23 1287
jbe@23 1288 This method loads referenced objects and attaches them with the objects of the existent list. The "ref" and "back_ref" arguments passed to "add_reference" are used for the attachment, unless aliases are given with "ref_alias" and "back_ref_alias". If "options" are set, these options are passed to the reference loader. The default reference loader supports only one option named "order". If "order" is set to nil, the default order is used, if "order" is set to false, no ORDER BY statment is included in the selector, otherwise the given expression is used for ordering.
jbe@23 1289
jbe@23 1290 This method is not only available for database result lists but also for database result objects.
jbe@23 1291
jbe@23 1292 --]]--
jbe/bsw@0 1293 function class_prototype.list.load(...)
jbe/bsw@0 1294 return class_prototype.list.get_reference_selector(...):exec()
jbe/bsw@0 1295 end
jbe@23 1296 --//--
jbe/bsw@0 1297
jbe@23 1298 --[[--
jbe@23 1299 db_object =
jbe@23 1300 <db_object>:get_reference_selector(
jbe@23 1301 ref_name, -- name of reference (e.g. "children")
jbe@23 1302 options, -- table options passed to the reference loader (e.g. { order = ... })
jbe@23 1303 ref_alias, -- optional alias for the reference (e.g. "ordered_children")
jbe@23 1304 back_ref_alias -- back reference name (e.g. "parent")
jbe@23 1305 )
jbe@23 1306
jbe@23 1307 This method returns a special selector for selecting referenced objects. It is prepared in a way, that on execution of the selector, all returned objects are attached with the objects of the existent list. The "ref" and "back_ref" arguments passed to "add_reference" are used for the attachment, unless aliases are given with "ref_alias" and "back_ref_alias". If "options" are set, these options are passed to the reference loader. The default reference loader supports only one option named "order". If "order" is set to nil, the default order is used, if "order" is set to false, no ORDER BY statment is included in the selector, otherwise the given expression is used for ordering.
jbe@23 1308
jbe@23 1309 This method is not only available for database result objects but also for database result lists.
jbe@23 1310
jbe@23 1311 --]]--
jbe/bsw@0 1312 function class_prototype.object:get_reference_selector(...)
jbe/bsw@0 1313 local list = self._class:create_list()
jbe/bsw@0 1314 list[1] = self
jbe/bsw@0 1315 return list:get_reference_selector(...)
jbe/bsw@0 1316 end
jbe@23 1317 --//--
jbe/bsw@0 1318
jbe@23 1319 --[[--
jbe@23 1320 db_list_or_object =
jbe@23 1321 <db_object>:load(
jbe@23 1322 ref_name, -- name of reference (e.g. "children")
jbe@23 1323 options, -- table options passed to the reference loader (e.g. { order = ... })
jbe@23 1324 ref_alias, -- optional alias for the reference (e.g. "ordered_children")
jbe@23 1325 back_ref_alias -- back reference name (e.g. "parent")
jbe@23 1326 )
jbe@23 1327
jbe@23 1328 This method loads referenced objects and attaches them with the objects of the existent list. The "ref" and "back_ref" arguments passed to "add_reference" are used for the attachment, unless aliases are given with "ref_alias" and "back_ref_alias". If "options" are set, these options are passed to the reference loader. The default reference loader supports only one option named "order". If "order" is set to nil, the default order is used, if "order" is set to false, no ORDER BY statment is included in the selector, otherwise the given expression is used for ordering.
jbe@23 1329
jbe@23 1330 This method is not only available for database result objects but also for database result lists. Calling this method for objects is unneccessary, unless additional options and/or an alias is used.
jbe@23 1331
jbe@23 1332 --]]--
jbe/bsw@0 1333 function class_prototype.object.load(...)
jbe/bsw@0 1334 return class_prototype.object.get_reference_selector(...):exec()
jbe/bsw@0 1335 end
jbe@23 1336 --//--
jbe/bsw@0 1337
jbe@23 1338 --[[--
jbe@23 1339 db_class = -- same class returned
jbe@23 1340 <db_class>:add_reference{
jbe@23 1341 mode = mode, -- "11", "1m", "m1", or "mm" (one/many to one/many)
jbe@23 1342 to = to, -- referenced class (model), optionally as string or function returning the value (avoids autoload)
jbe@23 1343 this_key = this_key, -- name of key in this class (model)
jbe@23 1344 that_key = that_key, -- name of key in the other class (model) ("to" argument)
jbe@23 1345 ref = ref, -- name of reference in this class, referring to the other class
jbe@23 1346 back_ref = back_ref, -- name of reference in other class, referring to this class
jbe@23 1347 default_order = default_order, -- expression as passed to "assemble_command" used for sorting
jbe@23 1348 selector_generator = selector_generator, -- alternative function used as selector generator (use only, when you know what you are doing)
jbe@23 1349 connected_by_table = connected_by_table, -- connecting table used for many to many relations
jbe@23 1350 connected_by_this_key = connected_by_this_key, -- key in connecting table referring to "this_key" of this class (model)
jbe@23 1351 connected_by_that_key = connected_by_that_key -- key in connecting table referring to "that_key" in other class (model) ("to" argument)
jbe@23 1352 }
jbe/bsw@0 1353
jbe@23 1354 Denotes a reference from one database class to another database class (model to model relation). There are 4 possible types of references: one-to-one (mode = "11"), one-to-many (mode = "1m"), many-to-one ("m1"), and many-to-many ("mm"). References usually should be defined in both models, which are related to each other, with mirrored mode (i.e. "1m" in one model, and "m1" in the other). One-to-one and one-to-many references may have a "back_ref" setting, which causes that loaded objects of the referenced class, refer back to the originating object. One-to-many and many-to-many references may have a "default_order" setting, which selects the default order for selected objects. When adding a many-to-many reference, the argument "connected_by_table", "connected_by_this_key" and "connected_by_that_key" must be set additionally.
jbe@23 1355
jbe@23 1356 --]]--
jbe/bsw@0 1357 function class_prototype:add_reference(args)
jbe/bsw@0 1358 local selector_generator = args.selector_generator
jbe/bsw@0 1359 local mode = args.mode
jbe/bsw@0 1360 local to = args.to
jbe/bsw@0 1361 local this_key = args.this_key
jbe/bsw@0 1362 local that_key = args.that_key
jbe/bsw@0 1363 local connected_by_table = args.connected_by_table -- TODO: split to table and schema
jbe/bsw@0 1364 local connected_by_this_key = args.connected_by_this_key
jbe/bsw@0 1365 local connected_by_that_key = args.connected_by_that_key
jbe/bsw@0 1366 local ref = args.ref
jbe/bsw@0 1367 local back_ref = args.back_ref
jbe/bsw@0 1368 local default_order = args.default_order
jbe/bsw@0 1369 local model
jbe/bsw@0 1370 local function get_model()
jbe/bsw@0 1371 if not model then
jbe/bsw@0 1372 if type(to) == "string" then
jbe/bsw@0 1373 model = _G
jbe/bsw@0 1374 for path_element in string.gmatch(to, "[^.]+") do
jbe/bsw@0 1375 model = model[path_element]
jbe/bsw@0 1376 end
jbe/bsw@0 1377 elseif type(to) == "function" then
jbe/bsw@0 1378 model = to()
jbe/bsw@0 1379 else
jbe/bsw@0 1380 model = to
jbe/bsw@0 1381 end
jbe/bsw@0 1382 end
jbe/bsw@0 1383 if not model or model == _G then
jbe/bsw@0 1384 error("Could not get model for reference.")
jbe/bsw@0 1385 end
jbe/bsw@0 1386 return model
jbe/bsw@0 1387 end
jbe/bsw@0 1388 self.references[ref] = {
jbe/bsw@0 1389 mode = mode,
jbe/bsw@0 1390 this_key = this_key,
jbe/bsw@0 1391 that_key = connected_by_table and "mm_ref_" or that_key,
jbe/bsw@0 1392 ref = ref,
jbe/bsw@0 1393 back_ref = back_ref,
jbe/bsw@0 1394 selector_generator = selector_generator or function(list, options)
jbe/bsw@0 1395 -- TODO: support tuple keys
jbe/bsw@0 1396 local options = options or {}
jbe/bsw@0 1397 local model = get_model()
jbe/bsw@0 1398 -- TODO: too many records cause PostgreSQL command stack overflow
jbe/bsw@0 1399 local ids = { sep = ", " }
jbe/bsw@0 1400 for i, object in ipairs(list) do
jbe/bsw@0 1401 local id = object[this_key]
jbe/bsw@0 1402 if id ~= nil then
jbe/bsw@0 1403 ids[#ids+1] = {"?", id}
jbe/bsw@0 1404 end
jbe/bsw@0 1405 end
jbe/bsw@0 1406 if #ids == 0 then
jbe/bsw@0 1407 return model:new_selector():empty_list_mode()
jbe/bsw@0 1408 end
jbe/bsw@0 1409 local selector = model:new_selector()
jbe/bsw@0 1410 if connected_by_table then
jbe/bsw@0 1411 selector:join(
jbe/bsw@0 1412 connected_by_table,
jbe/bsw@0 1413 nil,
jbe/bsw@0 1414 {
jbe/bsw@0 1415 '$."$" = $."$"',
jbe/bsw@0 1416 {connected_by_table},
jbe/bsw@0 1417 {connected_by_that_key},
jbe/bsw@0 1418 {model:get_qualified_table()},
jbe/bsw@0 1419 {that_key}
jbe/bsw@0 1420 }
jbe/bsw@0 1421 )
jbe/bsw@0 1422 selector:add_field(
jbe/bsw@0 1423 {
jbe/bsw@0 1424 '$."$"',
jbe/bsw@0 1425 {connected_by_table},
jbe/bsw@0 1426 {connected_by_this_key}
jbe/bsw@0 1427 },
jbe/bsw@0 1428 'mm_ref_'
jbe/bsw@0 1429 )
jbe/bsw@0 1430 selector:add_where{
jbe/bsw@0 1431 '$."$" IN ($)',
jbe/bsw@0 1432 {connected_by_table},
jbe/bsw@0 1433 {connected_by_this_key},
jbe/bsw@0 1434 ids
jbe/bsw@0 1435 }
jbe/bsw@0 1436 else
jbe/bsw@6 1437 selector:add_where{'$."$" IN ($)', {model:get_qualified_table()}, {that_key}, ids}
jbe/bsw@0 1438 end
jbe/bsw@0 1439 if options.order == nil and default_order then
jbe/bsw@0 1440 selector:add_order_by(default_order)
jbe/bsw@0 1441 elseif options.order then
jbe/bsw@0 1442 selector:add_order_by(options.order)
jbe/bsw@0 1443 end
jbe/bsw@0 1444 return selector
jbe/bsw@0 1445 end
jbe/bsw@0 1446 }
jbe/bsw@0 1447 if mode == "m1" or mode == "11" then
jbe/bsw@0 1448 self.foreign_keys[this_key] = ref
jbe/bsw@0 1449 end
jbe/bsw@0 1450 return self
jbe/bsw@0 1451 end
jbe@23 1452 --//--
jbe@23 1453
jbe@67 1454 return _M
jbe@67 1455

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