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jbe/bsw@0
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1 #!/usr/bin/env lua
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jbe@64
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2 mondelefant = require("mondelefant")
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jbe/bsw@0
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3
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jbe/bsw@0
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4 -- Standarddatenbankverbindung ist globale Variable 'db'
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jbe/bsw@0
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5 function mondelefant.class_prototype:get_db_conn() return db end
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jbe/bsw@0
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6
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jbe/bsw@0
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7 -- Verbindung aufbauen
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jbe/bsw@0
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8 db = assert(mondelefant.connect{engine='postgresql', dbname='test'})
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jbe/bsw@0
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9
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jbe/bsw@0
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10 Product = mondelefant.new_class{ table = "product" }
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jbe/bsw@0
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11 ProductVariant = mondelefant.new_class{ table = "product_variant" }
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jbe/bsw@0
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12
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jbe/bsw@0
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13 Product:add_reference{
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jbe/bsw@0
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14 mode = "1m",
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jbe/bsw@0
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15 to = ProductVariant,
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jbe/bsw@0
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16 this_key = "number",
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jbe/bsw@0
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17 that_key = "product_number",
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jbe/bsw@0
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18 ref = "product_variants",
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jbe/bsw@0
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19 back_ref = "product",
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jbe/bsw@0
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20 --default_order = '"number"'
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jbe/bsw@0
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21 }
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jbe/bsw@0
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22
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jbe/bsw@0
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23 ProductVariant:add_reference{
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jbe/bsw@0
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24 mode = "m1",
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jbe/bsw@0
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25 to = Product,
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jbe/bsw@0
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26 this_key = "product_number",
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jbe/bsw@0
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27 that_key = "number",
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jbe/bsw@0
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28 ref = "product",
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jbe/bsw@0
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29 back_ref = nil,
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jbe/bsw@0
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30 --default_order = '"id"'
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jbe/bsw@0
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31 }
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jbe/bsw@0
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32
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jbe/bsw@0
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33 p = Product:new_selector():single_object_mode():add_where{"name=?", "Noodles"}:exec()
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jbe/bsw@0
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34
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jbe/bsw@0
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35
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jbe/bsw@0
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36 --[[
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jbe/bsw@0
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37 -- Neue Datenbankklasse definieren
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jbe/bsw@0
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38 Product = mondelefant.new_class{ table = '"product"' }
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jbe/bsw@0
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39
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jbe/bsw@0
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40 -- Methode der Klasse, um sofort eine alphabetische Liste aller Produkte
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jbe/bsw@0
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41 -- zu bekommen
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jbe/bsw@0
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42 function Product:get_all_ordered_by_name()
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jbe/bsw@0
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43 local selector = self:new_selector()
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jbe/bsw@0
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44 selector:add_order_by('"name"')
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jbe/bsw@0
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45 selector:add_order_by('"id"')
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jbe/bsw@0
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46 return selector:exec()
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jbe/bsw@0
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47 end
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jbe/bsw@0
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48
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jbe/bsw@0
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49 function Product.object_get:name_length(key)
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jbe/bsw@0
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50 local value = #self.name
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jbe/bsw@0
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51 self._data.name_length = value
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jbe/bsw@0
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52 return value
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jbe/bsw@0
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53 end
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jbe/bsw@0
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54
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jbe/bsw@0
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55 function Product.object_set:quality(value)
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jbe/bsw@0
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56 if value == "perfect" or value == "good" or value == "trash" then
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jbe/bsw@0
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57 self._data.quality = value
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jbe/bsw@0
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58 else
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jbe/bsw@0
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59 self._data.quality = nil
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jbe/bsw@0
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60 end
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jbe/bsw@0
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61 self._dirty.quality = true
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jbe/bsw@0
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62 end
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jbe/bsw@0
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63
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jbe/bsw@0
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64 -- Methode der Listen, um sie auszugeben
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jbe/bsw@0
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65 function Product.list:print()
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jbe/bsw@0
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66 for i, product in ipairs(self) do
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jbe/bsw@0
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67 print(product.id, product.name, product.name_length)
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jbe/bsw@0
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68 end
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jbe/bsw@0
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69 end
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jbe/bsw@0
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70
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jbe/bsw@0
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71 products = Product:get_all_ordered_by_name()
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jbe/bsw@0
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72 products:print()
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jbe/bsw@0
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73 products[1].quality = "perfect"
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jbe/bsw@0
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74 print(products[1].quality)
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jbe/bsw@0
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75 products[2].quality = "I don't know."
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jbe/bsw@0
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76 print(products[2].quality)
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jbe/bsw@0
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77 products[3].name = "Produkt Eins!"
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jbe/bsw@0
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78 products[3].quality = "perfect"
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jbe/bsw@0
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79 products[3]:save()
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jbe/bsw@0
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80
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jbe/bsw@0
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81 sel = db:new_selector()
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jbe/bsw@0
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82 sel:from('"product_variant"')
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jbe/bsw@0
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83 sel:add_field("*")
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jbe/bsw@0
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84 sel:attach("m1", products, "product_id", "id", "product", "product_variants")
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jbe/bsw@0
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85 product_variants = sel:exec()
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jbe@64
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86 --]]
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