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271 lines
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<title>Example: SQL statements in REXX programs</title>
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<body id="rzajpssrexx"><a name="rzajpssrexx"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: SQL statements in REXX programs</h1>
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<div><p>This sample program is written in the REXX programming language.</p>
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<div class="section"> <div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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</div>
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<div class="example"> <div class="fignone" id="rzajpssrexx__samprex"><a name="rzajpssrexx__samprex"><!-- --></a><span class="figcap">Figure 1. Sample REXX Procedure Using
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SQL Statements</span><pre>Record *...+... 1 ...+... 2 ...+... 3 ...+... 4 ...+... 5 ...+... 6 ...+... 7 ...+... 8
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1 /*********************************************************************/
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2 /* A sample program which updates the salaries for those employees */
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3 /* whose current commission total is greater than or equal to the */
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4 /* value of COMMISSION. The salaries of those who qualify are */
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5 /* increased by the value of PERCENTAGE, retroactive to RAISE_DATE. */
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6 /* A report is generated and dumped to the display which shows the */
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7 /* projects which these employees have contributed to, ordered by */
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8 /* project number and employee ID. A second report shows each */
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9 /* project having an end date occurring after RAISE DATE (i.e. is */
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10 /* potentially affected by the retroactive raises) with its total */
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11 /* salary expenses and a count of employees who contributed to the */
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12 /* project. */
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13 /*********************************************************************/
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14
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15
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16 /* Initialize RC variable */
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17 RC = 0
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18
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19 /* Initialize HV for program usage */
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20 COMMISSION = 2000.00;
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21 PERCENTAGE = 1.04;
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22 RAISE_DATE = '1982-06-01';
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23 WORK_DAYS = 253;
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24
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25 /* Create the output file to dump the 2 reports. Perform an OVRDBF */
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26 /* to allow us to use the SAY REXX command to write to the output */
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27 /* file. */
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28 ADDRESS '*COMMAND',
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29 'DLTF FILE(CORPDATA/REPORTFILE)'
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30 ADDRESS '*COMMAND',
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31 'CRTPF FILE(CORPDATA/REPORTFILE) RCDLEN(80)'
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32 ADDRESS '*COMMAND',
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33 'OVRDBF FILE(STDOUT) TOFILE(CORPDATA/REPORTFILE) MBR(REPORTFILE)'
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34
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35 /* Update the selected employee's salaries by the new percentage. */
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36 /* If an error occurs during the update, ROLLBACK the changes. */
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37 <span><span>3</span></span>SIGNAL ON ERROR
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38 ERRLOC = 'UPDATE_ERROR'
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39 UPDATE_STMT = 'UPDATE CORPDATA/EMPLOYEE ',
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40 'SET SALARY = SALARY * ? ',
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41 'WHERE COMM >= ? '
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42 EXECSQL,
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43 'PREPARE S1 FROM :UPDATE_STMT'
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44 <span><span>4</span></span>EXECSQL,
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45 'EXECUTE S1 USING :PERCENTAGE,',
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46 ' :COMMISSION '
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47 /* Commit changes */
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48 <span><span>5</span></span>EXECSQL,
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49 'COMMIT'
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50 ERRLOC = 'REPORT_ERROR'
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51
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</pre>
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</div>
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</div>
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<div class="example"><div class="fignone"><pre>Record *...+... 1 ...+... 2 ...+... 3 ...+... 4 ...+... 5 ...+... 6 ...+... 7 ...+... 8
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52 /* Report the updated statistics for each project supported by one */
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53 /* of the selected employees. */
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54
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55 /* Write out the header for Report 1 */
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56 SAY ' '
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57 SAY ' '
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58 SAY ' '
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59 SAY ' REPORT OF PROJECTS AFFECTED BY EMPLOYEE RAISES'
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60 SAY ' '
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61 SAY 'PROJECT EMPID EMPLOYEE NAME SALARY'
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62 SAY '------- ----- ------------- ------'
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63 SAY ' '
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64
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65 SELECT_STMT = 'SELECT DISTINCT PROJNO, EMPPROJACT.EMPNO, ',
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66 ' LASTNAME||'', ''||FIRSTNME, SALARY ',
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67 'FROM CORPDATA/EMPPROJACT, CORPDATA/EMPLOYEE ',
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68 'WHERE EMPPROJACT.EMPNO = EMPLOYEE.EMPNO AND ',
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69 ' COMM >= ? ',
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70 'ORDER BY PROJNO, EMPNO '
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71 EXECSQL,
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72 'PREPARE S2 FROM :SELECT_STMT'
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73 <span><span>6</span></span>EXECSQL,
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74 'DECLARE C1 CURSOR FOR S2'
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75 <span><span>7</span></span>EXECSQL,
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76 'OPEN C1 USING :COMMISSION'
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77
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78 /* Handle the FETCH errors and warnings inline */
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79 SIGNAL OFF ERROR
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80
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81 /* Fetch all of the rows */
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82 DO UNTIL (SQLCODE <> 0)
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83 <span><span>9</span></span>EXECSQL,
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84 'FETCH C1 INTO :RPT1.PROJNO, :RPT1.EMPNO,',
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85 ' :RPT1.NAME, :RPT1.SALARY '
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86
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87 /* Process any errors that may have occurred. Continue so that */
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88 /* we close the cursor for any warnings. */
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89 IF SQLCODE < 0 THEN
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90 SIGNAL ERROR
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91
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92 /* Stop the loop when we hit the EOF. Don't try to print out the */
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93 /* fetched values. */
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94 <span><span>8</span></span>IF SQLCODE = 100 THEN
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95 LEAVE
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96
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97 /* Print out the fetched row */
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98 SAY RPT1.PROJNO ' ' RPT1.EMPNO ' ' RPT1.NAME ' ' RPT1.SALARY
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99 END;
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100
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101 <span><span>10</span></span>EXECSQL,
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102 'CLOSE C1'
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103
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..+... 1 ...+... 2 ...+... 3 ...+... 4 ...+... 5 ...+... 6 ...+... 7 ...+... 8
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104 /* For all projects ending at a date later than 'raise_date' */
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105 /* (i.e. those projects potentially affected by the salary raises) */
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106 /* generate a report containing the project number, project name */
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107 /* the count of employees participating in the project and the */
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108 /* total salary cost of the project. */
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109</pre>
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</div>
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</div>
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<div class="example"><div class="fignone"><pre>Record *...+... 1 ...+... 2 ...+... 3 ...+... 4 ...+... 5 ...+... 6 ...+... 7 ...+... 8
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110 /* Write out the header for Report 2 */
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111 SAY ' '
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112 SAY ' '
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113 SAY ' '
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114 SAY ' ACCUMULATED STATISTICS BY PROJECT'
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115 SAY ' '
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116 SAY 'PROJECT PROJECT NAME NUMBER OF TOTAL'
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117 SAY 'NUMBER EMPLOYEES COST'
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118 SAY '------- ------------ --------- -----'
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119 SAY ' '
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120
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121
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122 /* Go to the common error handler */
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123 SIGNAL ON ERROR
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124
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125 SELECT_STMT = 'SELECT EMPPROJACT.PROJNO, PROJNAME, COUNT(*), ',
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126 ' SUM( (DAYS(EMENDATE) - DAYS(EMSTDATE)) * EMPTIME * ',
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127 ' DECIMAL(( SALARY / ? ),8,2) ) ',
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128 'FROM CORPDATA/EMPPROJACT, CORPDATA/PROJECT, CORPDATA/EMPLOYEE',
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129 'WHERE EMPPROJACT.PROJNO = PROJECT.PROJNO AND ',
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130 ' EMPPROJACT.EMPNO = EMPLOYEE.EMPNO AND ',
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131 ' PRENDATE > ? ',
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132 'GROUP BY EMPPROJACT.PROJNO, PROJNAME ',
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133 'ORDER BY 1 '
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134 EXECSQL,
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135 'PREPARE S3 FROM :SELECT_STMT'
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136 <span><span>11</span></span>EXECSQL,
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137 'DECLARE C2 CURSOR FOR S3'
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138 EXECSQL,
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139 'OPEN C2 USING :WORK_DAYS, :RAISE_DATE'
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140
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141 /* Handle the FETCH errors and warnings inline */
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142 SIGNAL OFF ERROR
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143
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144 /* Fetch all of the rows */
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145 DO UNTIL (SQLCODE <> 0)
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146 <span><span>12</span></span>EXECSQL,
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147 'FETCH C2 INTO :RPT2.PROJNO, :RPT2.PROJNAME, ',
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148 ' :RPT2.EMPCOUNT, :RPT2.TOTAL_COST '
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149
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150 /* Process any errors that may have occurred. Continue so that */
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151 /* we close the cursor for any warnings. */
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152 IF SQLCODE < 0 THEN
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153 SIGNAL ERROR
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154
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155 /* Stop the loop when we hit the EOF. Don't try to print out the */
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156 /* fetched values. */
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157 IF SQLCODE = 100 THEN
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158 LEAVE
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159
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160 /* Print out the fetched row */
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161 SAY RPT2.PROJNO ' ' RPT2.PROJNAME ' ' ,
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162 RPT2.EMPCOUNT ' ' RPT2.TOTAL_COST
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163 END;
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164
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165 EXECSQL,
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166 'CLOSE C2'
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167</pre>
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</div>
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</div>
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<div class="example"><div class="fignone"><pre> 168 /* Delete the OVRDBF so that we will continue writing to the output */
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169 /* display. */
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170 ADDRESS '*COMMAND',
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171 'DLTOVR FILE(STDOUT)'
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172
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173 /* Leave procedure with a successful or warning RC */
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174 EXIT RC
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175
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176
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177 /* Error occurred while updating the table or generating the */
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178 /* reports. If the error occurred on the UPDATE, rollback all of */
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179 /* the changes. If it occurred on the report generation, display the */
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180 /* REXX RC variable and the SQLCODE and exit the procedure. */
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181 ERROR:
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182
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183 <span><span>13</span></span>SIGNAL OFF ERROR
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184
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185 /* Determine the error location */
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186 SELECT
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187 /* When the error occurred on the UPDATE statement */
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188 WHEN ERRLOC = 'UPDATE_ERROR' THEN
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190 DO
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191 SAY '*** ERROR Occurred while updating table.',
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192 'SQLCODE = ' SQLCODE
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193 <span><span>14</span></span>EXECSQL,
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194 'ROLLBACK'
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195 END
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196 /* When the error occurred during the report generation */
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197 WHEN ERRLOC = 'REPORT_ERROR' THEN
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198 SAY '*** ERROR Occurred while generating reports. ',
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199 'SQLCODE = ' SQLCODE
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200 OTHERWISE
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201 SAY '*** Application procedure logic error occurred '
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202 END
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203
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204 /* Delete the OVRDBF so that we will continue writing to the */
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205 /* output display. */
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206 ADDRESS '*COMMAND',
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207 'DLTOVR FILE(STDOUT)'
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208
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209 /* Return the error RC received from SQL. */
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210 EXIT RC
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211 * * * * * E N D O F S O U R C E * * * * *</pre>
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</div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajpsamprog.htm" title="This topic contains a sample application showing how to code SQL statements in each of the languages supported by the DB2 UDB for iSeries system.">Sample programs using DB2 UDB for iSeries statements</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzajprexx.htm" title="REXX procedures do not have to be preprocessed. At run time, the REXX interpreter passes statements that it does not understand to the current active command environment for processing.">Code SQL statements in REXX applications</a></div>
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