60 lines
3.8 KiB
HTML
60 lines
3.8 KiB
HTML
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<meta name="DC.Title" content="Length of string arguments in DB2 UDB CLI functions" />
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<meta name="DC.subject" content="string arguments, character strings, SQL_NTS, null-terminated strings" />
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<title>Length of string arguments in DB2 UDB CLI functions</title>
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<body id="rzadpstringlength"><a name="rzadpstringlength"><!-- --></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">Length of string arguments in DB2 UDB CLI functions</h1>
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<div><p>Input string arguments have an associated length argument. This argument
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indicates to DB2<sup>®</sup> UDB
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CLI, either the length of the allocated buffer (not including the null byte
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terminator), or the special value SQL_NTS. If SQL_NTS is passed, DB2 UDB CLI determines
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the length of the string by locating the null terminating character.</p>
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<p>Output string arguments have two associated length arguments, one to specify
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the length of the allocated buffer and one to return the length of the string
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returned by DB2 UDB
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CLI. The returned length value is the total length of the string available
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for return, whether it fits in the buffer or not.</p>
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<p>For SQL column data, if the output is an empty string, SQL_NULL_DATA is
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returned in the length argument.</p>
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<p>If a function is called with a null pointer for an output length argument, DB2 UDB
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CLI does not return a length. This might be useful when it is known that the
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buffers are large enough for all possible results. If DB2 UDB CLI attempts to return the SQL_NULL_DATA
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value to indicate a column contains null data and the output length argument
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is a null pointer, the function call fails.</p>
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<p>Every character string that DB2 UDB CLI returns is terminated with a
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null terminating character (hexadecimal 00), except for strings
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that are returned from graphic data types. This requires that all buffers
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allocate enough space for the maximum number that are expected, plus one for
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the null-terminating character.</p>
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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="rzadpstringarguments.htm" title="These topics discuss some conventions when dealing with the various aspects of working with string arguments in DB2 UDB CLI functions.">Work with string arguments in DB2 UDB CLI functions</a></div>
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