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1
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DEFINE TEMP-TABLE tt1
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2
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FIELD f1 AS INT
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3
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FIELD f2 AS DATE.
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4
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5
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DEFINE TEMP-TABLE tt2
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6
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FIELD f1 AS INT
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7
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FIELD f2 AS DATE.
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8
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9
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/* create initial [tt2.f1 = ?0 and tt2.f2 is null] */
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10
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CREATE tt1. ASSIGN tt1.f1 = -1 tt1.f2 = ?.
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11
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CREATE tt2. ASSIGN tt2.f1 = -1 tt2.f2 = 01/01/01.
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12
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13
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/* reset to [tt2.f1 = ?0 and tt2.f2 = ?1] */
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14
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CREATE tt1. ASSIGN tt1.f1 = 2 tt1.f2 = TODAY.
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15
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CREATE tt2. ASSIGN tt2.f1 = 2 tt2.f2 = TODAY.
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16
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17
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/* reset back to [tt2.f1 = ?0 and tt2.f2 is null] */
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18
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CREATE tt1. ASSIGN tt1.f1 = 3 tt1.f2 = ?.
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19
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CREATE tt2. ASSIGN tt2.f1 = 3 tt2.f2 = ?.
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20
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21
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/* hql kept! */
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22
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CREATE tt1. ASSIGN tt1.f1 = 0 tt1.f2 = ?.
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23
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CREATE tt2. ASSIGN tt2.f1 = 0 tt2.f2 = TODAY.
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24
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25
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/* reset to [tt2.f1 is null and tt2.f2 = ?0] */
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26
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CREATE tt1. ASSIGN tt1.f1 = ? tt1.f2 = 10/10/10.
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27
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CREATE tt2. ASSIGN tt2.f1 = ? tt2.f2 = TODAY.
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28
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29
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/* load from cache [tt2.f1 = ?0 and tt2.f2 = ?1] */
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30
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CREATE tt1. ASSIGN tt1.f1 = 5 tt1.f2 = 12/12/12.
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31
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CREATE tt2. ASSIGN tt2.f1 = 5 tt2.f2 = 12/12/12.
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32
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33
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/* hql kept! */
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34
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CREATE tt1. ASSIGN tt1.f1 = 7 tt1.f2 = 11/11/11.
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35
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CREATE tt2. ASSIGN tt2.f1 = 7 tt2.f2 = 11/11/11.
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36
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37
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38
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/* common for multiple functions */
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39
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DEFINE QUERY qq FOR tt1, tt2.
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40
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DEFINE VAR cnt AS INTEGER.
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41
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42
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FUNCTION f-dynamic RETURN INTEGER () :
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43
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DISPLAY "Dynamic" SKIP WITH NO-LABEL FRAME fr-dynamic.
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44
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DEFINE VARIABLE qh AS HANDLE NO-UNDO.
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45
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CREATE QUERY qh.
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46
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qh:SET-BUFFERS(BUFFER tt1:HANDLE, BUFFER tt2:HANDLE).
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47
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qh:QUERY-PREPARE("FOR EACH tt1, EACH tt2 WHERE tt2.f1 EQ tt1.f1 AND tt2.f2 EQ tt1.f2").
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48
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qh:QUERY-OPEN.
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49
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qh:GET-NEXT(NO-LOCK).
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50
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cnt = 1.
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51
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52
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DO WHILE NOT qh:QUERY-OFF-END:
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53
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DISPLAY tt1 WITH FRAME fr-dynamic.
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54
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DISPLAY tt2 WITH FRAME fr-dynamic.
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55
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cnt = cnt * tt1.f1.
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56
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qh:GET-NEXT().
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57
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END.
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58
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59
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qh:QUERY-CLOSE().
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60
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DELETE OBJECT qh.
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61
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RETURN cnt.
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62
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END FUNCTION.
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63
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64
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65
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FUNCTION f-static RETURN INTEGER () :
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66
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DISPLAY "Static" SKIP WITH NO-LABEL FRAME fr-static.
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67
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cnt = 1.
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68
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69
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FOR EACH tt1, EACH tt2 WHERE tt2.f1 EQ tt1.f1 AND tt2.f2 EQ tt1.f2:
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70
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DISPLAY tt1 WITH FRAME fr-static.
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71
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DISPLAY tt2 WITH FRAME fr-static.
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72
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cnt = cnt * tt1.f1.
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73
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END.
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74
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75
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RETURN cnt.
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76
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END FUNCTION.
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77
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78
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79
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FUNCTION f-static-query RETURN INTEGER () :
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80
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DISPLAY "Static Query" SKIP WITH NO-LABEL FRAME fr-static-query.
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81
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OPEN QUERY qq FOR EACH tt1, EACH tt2 WHERE tt2.f1 EQ tt1.f1 AND tt2.f2 EQ tt1.f2.
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82
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GET FIRST qq.
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83
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cnt = 1.
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84
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85
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DO WHILE AVAILABLE tt1:
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86
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DISPLAY tt1 WITH FRAME fr-static-query.
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87
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DISPLAY tt2 WITH FRAME fr-static-query.
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88
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cnt = cnt * tt1.f1.
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89
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GET NEXT qq.
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90
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END.
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91
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92
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RETURN cnt.
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93
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END FUNCTION.
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94
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95
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96
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FUNCTION f-static-preselect RETURN INTEGER () :
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97
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DISPLAY "Static Preselect" SKIP WITH NO-LABEL FRAME fr-static-preselect.
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98
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OPEN QUERY qq PRESELECT EACH tt1, EACH tt2 WHERE tt2.f1 EQ tt1.f1 AND tt2.f2 EQ tt1.f2.
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99
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GET FIRST qq.
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100
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cnt = 1.
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101
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102
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DO WHILE AVAILABLE tt1:
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103
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DISPLAY tt1 WITH FRAME fr-static-preselect.
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104
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DISPLAY tt2 WITH FRAME fr-static-preselect.
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105
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cnt = cnt * tt1.f1.
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106
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GET NEXT qq.
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107
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END.
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108
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109
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RETURN cnt.
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110
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END FUNCTION.
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111
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112
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DISPLAY "Expected: 2 * 3 * 5 * 7 = 210" SKIP
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113
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f-dynamic() f-static() f-static-query() f-static-preselect().
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114
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115
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/* actual P4GL output:
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116
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┌───────────────────────────────────────┐
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117
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│Dynamic │
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118
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│ 7 11/11/11 7 11/11/11│
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119
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└───────────────────────────────────────┘
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120
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┌───────────────────────────────────────┐
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121
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│Static │
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122
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│ 7 11/11/11 7 11/11/11│
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123
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└───────────────────────────────────────┘
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124
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┌───────────────────────────────────────┐
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125
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│Static Query │
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126
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│ 7 11/11/11 7 11/11/11│
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127
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└───────────────────────────────────────┘
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128
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┌───────────────────────────────────────┐
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129
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│Static Preselect │
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130
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│ 7 11/11/11 7 11/11/11│
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131
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└───────────────────────────────────────┘
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132
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┌───────────────────────────────────────────┐
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133
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│Expected: 2 * 3 * 5 * 7 = 210 │
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134
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│ 210 210 210 210│
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135
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└───────────────────────────────────────────┘
|
|
136
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*/
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