105 lines
7.6 KiB
HTML
105 lines
7.6 KiB
HTML
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Assignment rules for host variables in SQL statements</title>
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</head>
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<body id="rzajpasnrule"><a name="rzajpasnrule"><!-- --></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">Assignment rules for host variables in SQL statements</h1>
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<div><p>SQL values are assigned to host variables during the running of
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FETCH, SELECT INTO, SET, and VALUES INTO statements. SQL values are assigned
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from host variables during the running of INSERT, UPDATE, and CALL statements.</p>
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<div class="section"><p>All assignment operations observe the following rules: </p>
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<ul><li>Numbers and strings are compatible: <ul><li>Numbers can be assigned to character or graphic string columns or host
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variables.</li>
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<li>Character and graphic strings can be assigned to numeric columns or numeric
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host variables.</li>
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</ul>
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</li>
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<li>All character and DBCS graphic strings are compatible with UCS-2 and UTF-16
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graphic columns if conversion is supported between the CCSIDs. All graphic
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strings are compatible if the CCSIDs are compatible. All numeric values are
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compatible. Conversions are performed by SQL whenever necessary. All character
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and DBCS graphic strings are compatible with UCS-2 and UTF-16 graphic columns
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for assignment operations, if conversion is supported between the CCSIDs.
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For the CALL statement, character and DBCS graphic parameters are compatible
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with UCS-2 and UTF-16 parameters if conversion is supported.</li>
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<li>Binary strings are only compatible with binary strings.</li>
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<li>A null value cannot be assigned to a host variable that does not have
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an associated indicator variable.</li>
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<li>Different types of date/time values are not compatible. Dates are only
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compatible with dates or string representations of dates; times are only compatible
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with times or string representations of times; and timestamps are only compatible
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with timestamps or string representations of timestamps.<p>A date can be assigned
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only to a date column, a character column, a DBCS-open or DBCS-either column
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or variable, or a character variable. The insert or update value of a date
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column must be a date or a string representation of a date. A DBCS-open or
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DBCS-either variable is a variable that was declared in the host language
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by including the definition of an externally described file. DBCS-open
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variables are also declared if the job CCSID indicates MIXED data, or the
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DECLARE VARIABLE statement is used and a MIXED CCSID or the FOR MIXED DATA
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clause is specified.</p>
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<p>A time can be assigned only to a time column, a
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character column, a DBCS-open or DBCS-either column or variable, or a character
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variable. The insert or update value of a time column must be a time or a
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string representation of a time.</p>
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<p>A timestamp can be assigned only to
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a timestamp column, a character column, a DBCS-open or DBCS-either column
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or variable, or a character variable. The insert or update value of a timestamp
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column must be a timestamp or a string representation of a timestamp.</p>
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</li>
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</ul>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzajpstringrule.htm">Rules for string assignment of host variables in SQL statements</a></strong><br />
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This topic introduces rules regarding character string assignment.</li>
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<li class="ulchildlink"><strong><a href="rzajpccsidrule.htm">Rules for CCSIDs of host variables in SQL statements</a></strong><br />
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CCSIDs must be considered when you assign one character or graphic value to another. This includes the assignment of host variables. The database manager uses a common set of system services for converting SBCS data, DBCS data, MIXED data, and graphic data.</li>
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<li class="ulchildlink"><strong><a href="rzajpnumrule.htm">Rules for numeric assignment of host variables in SQL statements</a></strong><br />
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Rules regarding numeric assignment are as follows.</li>
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<li class="ulchildlink"><strong><a href="rzajpdaterule.htm">Rules for date, time, and timestamp assignment of host variables in SQL statements</a></strong><br />
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When a <strong>date</strong> is assigned to a host variable, the date is
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converted to the string representation specified by the DATFMT and DATSEP
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parameters of the CRTSQLxxx command.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajphostvar.htm" title="When your program retrieves data, the values are put into data items defined by your program and specified with the INTO clause of a SELECT INTO or FETCH statement. The data items are called host variables.">Use host variables in SQL statements</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../db2/rbafzmstdeclvar.htm">DECLARE VARIABLE</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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