111 lines
6.1 KiB
HTML
111 lines
6.1 KiB
HTML
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Title" content="Example 2: Select records using the Open Query File (OPNQRYF) command" />
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<meta name="abstract" content="This example shows how to select records with a specific date value using the Open Query File (OPNQRYF) command." />
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<meta name="description" content="This example shows how to select records with a specific date value using the Open Query File (OPNQRYF) command." />
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<title>Example 2: Select records using the Open Query File (OPNQRYF) command</title>
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</head>
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<body id="rbafodynsrex2"><a name="rbafodynsrex2"><!-- --></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 2: Select records using the Open Query File (OPNQRYF) command</h1>
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<div><p>This example shows how to select records with a specific date value
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using the Open Query File (OPNQRYF) command.</p>
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<div class="section"><div class="p">Assume that you want to process all records in which the <em>Date</em> field
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in the record is the same as the current date. Also assume that the <em>Date</em> field
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is in the same format as the system date. In a control language (CL) program,
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you can specify: <pre>DCL VAR(&CURDAT); TYPE(*CHAR) LEN(6)
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RTVSYSVAL SYSVAL(QDATE) RTNVAR(&CURDAT);
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OVRDBF FILE(FILEA) SHARE(*YES)
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OPNQRYF FILE(FILEA) QRYSLT('"' *CAT &CURDAT *CAT '" *EQ DATE')
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CALL PGM(PGMB)
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CLOF OPNID(FILEA)
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DLTOVR FILE(FILEA)</pre>
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</div>
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</div>
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<div class="section"><p>A CL variable is assigned with a leading ampersand (&) and
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is not enclosed in single quotation marks. The whole expression is enclosed
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in single quotation marks. The CAT operators and CL variable are enclosed
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in both single quotation marks and quotation marks.</p>
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</div>
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<div class="section"><p>It is important to know whether the data in the database is defined
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as character, date, time, timestamp, or numeric. In the preceding example,
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the <em>Date</em> field is assumed to be character.</p>
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</div>
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<div class="section"><div class="p">If the <em>DATE</em> field is defined as date data type, the preceding
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example can be specified as: <pre>OVRDBF FILE(FILEA) SHARE(*YES)
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OPNQRYF FILE(FILEA) QRYSLT('%CURDATE *EQ DATE')
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CALL PGM(PGMB)
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CLOF OPENID(FILEA)
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DLTOVR FILE(FILEA)</pre>
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<div class="note"><span class="notetitle">Note:</span> The date field does not have to have the
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same format as the system date.</div>
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You can also specify the example as: <pre>DCL VAR(&CVTDAT); TYPE(*CHAR) LEN(6)
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DCL VAR(&CURDAT); TYPE(*CHAR) LEN(8)
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RTVSYSVAL SYSVAL(QDATE) RTNVAR(&CVTDAT);
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CVTDAT DATE(&CVTDAT); TOVAR(&CURDAT); TOSEP(/)
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OVRDBF FILE(FILEA) SHARE(*YES)
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OPNQRYF FILE(FILEA)
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QRYSLT('"' *CAT &CURDAT *CAT '" *EQ DATE')
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CALL PGM(PGMB)
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CLOF OPNID (FILEA)
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DLTOVR FILE(FILEA)</pre>
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</div>
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</div>
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<div class="section"><div class="p">This is where <em>DATE</em> has a date data type in FILEA, the job
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default date format is MMDDYY, and the job default date separator is the slash
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(/). <div class="note"><span class="notetitle">Note:</span> For any character representation of a date in one of the following
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formats, MMDDYY, DDMMYY, YYMMDD, or Julian, the job default date format and
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separator must be the same to be recognized.</div>
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</div>
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</div>
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<div class="section"><div class="p">If, instead, you were using a constant, the QRYSLT would be specified
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as follows: <pre>QRYSLT('"12/31/87" *EQ DATE')</pre>
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The job default
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date format must be MMDDYY and the job default separator must be the slash
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(/).</div>
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</div>
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<div class="section"><div class="p">If a numeric field exists in the database and you want to compare
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it to a variable, only a character variable can be used. For example, to select
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all records where a packed <em>Date</em> field is greater than a variable, you
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must ensure that the variable is in character form. Normally, this means
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that before the OPNQRYF command, you use the Change Variable (CHGVAR) command
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to change the variable from a decimal field to a character field. The CHGVAR
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command would be specified as follows: <pre>CHGVAR VAR(&CHARVAR); VALUE('123188')</pre>
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</div>
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</div>
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<div class="section"><div class="p">The QRYSLT parameter would be specified as follows (see the difference
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from the preceding examples): <pre>QRYSLT(&CHARVAR *CAT ' *GT DATE')</pre>
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</div>
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</div>
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<div class="section"><div class="p">If, instead, you were using a constant, the QRYSLT statement would
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be specified as follows: <pre>QRYSLT('123187 *GT DATE')</pre>
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</div>
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</div>
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</div>
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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="rbafodynsrsex.htm" title="These topics provide examples of selecting records using the Open Query File (OPNQRYF) command.">Select records using the Open Query File (OPNQRYF) command</a></div>
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</div>
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</div>
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</body>
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</html>
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