160 lines
9.7 KiB
HTML
160 lines
9.7 KiB
HTML
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<meta name="DC.Title" content="SQLExecDirect - Execute a statement directly" />
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<title>SQLExecDirect</title>
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<body id="rzadpfnexecd"><a name="rzadpfnexecd"><!-- --></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">SQLExecDirect - Execute a statement directly</h1>
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<div><div class="section"></div>
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<div class="section"><h4 class="sectiontitle">Purpose</h4> <p><samp class="codeph">SQLExecDirect()</samp> directly
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executes the specified SQL statement. The statement can only be processed
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once. Also, the connected database server must be able to prepare the statement.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Syntax</h4><pre>SQLRETURN SQLExecDirect (SQLHSTMT hstmt,
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SQLCHAR *szSqlStr,
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SQLINTEGER cbSqlStr);</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Function arguments</h4>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="hsides" border="1" rules="all"><caption>Table 1. SQLExecDirect arguments</caption><thead align="left"><tr><th align="left" valign="bottom" width="20%" id="d0e48">Data type</th>
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<th align="left" valign="bottom" width="20%" id="d0e50">Argument</th>
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<th align="left" valign="bottom" width="20%" id="d0e52">Use</th>
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<th align="left" valign="bottom" width="40%" id="d0e54">Description</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="20%" headers="d0e48 ">SQLCHAR *</td>
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<td align="left" valign="top" width="20%" headers="d0e50 "><em>szSqlStr</em></td>
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<td align="left" valign="top" width="20%" headers="d0e52 ">Input</td>
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<td align="left" valign="top" width="40%" headers="d0e54 ">SQL statement string. The connected database
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server must be able to prepare the statement.</td>
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</tr>
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<tr><td align="left" valign="top" width="20%" headers="d0e48 ">SQLHSTMT</td>
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<td align="left" valign="top" width="20%" headers="d0e50 "><em>hstmt</em></td>
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<td align="left" valign="top" width="20%" headers="d0e52 ">Input</td>
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<td align="left" valign="top" width="40%" headers="d0e54 ">Statement handle. There must not be an open
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cursor associated with <em>hstmt</em>. See <a href="rzadpfnfstmt.htm#rzadpfnfstmt">SQLFreeStmt - Free (or reset) a statement handle</a>
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for more information.</td>
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</tr>
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<tr><td align="left" valign="top" width="20%" headers="d0e48 ">SQLINTEGER</td>
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<td align="left" valign="top" width="20%" headers="d0e50 "><em>cbSqlStr</em></td>
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<td align="left" valign="top" width="20%" headers="d0e52 ">Input</td>
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<td align="left" valign="top" width="40%" headers="d0e54 ">Length of contents of <em>szSqlStr</em> argument.
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The length must be set to either the exact length of the statement, or if
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the statement is null-terminated, set to SQL_NTS.</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Usage</h4><p>The SQL statement cannot be a COMMIT or ROLLBACK.
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Instead, <samp class="codeph">SQLTransact()</samp> must be called to issue COMMIT or
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ROLLBACK. For more information about supported SQL statements refer to <a href="rzadpdifferences.htm#rzadpdifferences__sqlsts">Table 1</a>.</p>
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<p>The SQL
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statement string might contain parameter markers. A parameter marker is represented
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by a "?" character, and indicates a position in the statement where the value
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of an application variable is to be substituted, when <samp class="codeph">SQLExecDirect()</samp> is
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called. <samp class="codeph">SQLBindParam()</samp> binds (or associates) an application
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variable to each parameter marker, to indicate if any data conversion should
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be performed at the time the data is transferred. All parameters must be bound
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before calling <samp class="codeph">SQLExecDirect()</samp>.</p>
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<p>If the SQL statement
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is a SELECT, <samp class="codeph">SQLExecDirect()</samp> generates a cursor name, and
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open the cursor. If the application has used <samp class="codeph">SQLSetCursorName()</samp> to
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associate a cursor name with the statement handle, DB2<sup>®</sup> UDB CLI associates the application generated
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cursor name with the internally generated one.</p>
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<p>To retrieve a row from
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the result set generated by a SELECT statement, call <samp class="codeph">SQLFetch()</samp> after <samp class="codeph">SQLExecDirect()</samp> returns
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successfully.</p>
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<p>If the SQL statement is a Positioned DELETE or a Positioned
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UPDATE, the cursor referenced by the statement must be positioned on a row.
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Additionally the SQL statement must be defined on a separate statement handle
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under the same connection handle.</p>
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<p>There must not be an open cursor on
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the statement handle.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Return codes</h4><ul><li>SQL_SUCCESS</li>
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<li>SQL_SUCCESS_WITH_INFO</li>
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<li>SQL_ERROR</li>
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<li>SQL_INVALID_HANDLE</li>
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<li>SQL_NO_DATA_FOUND</li>
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</ul>
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<p>SQL_NO_DATA_FOUND is returned if the SQL statement is a Searched UPDATE
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or Searched DELETE and no rows satisfy the search condition.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Diagnostics</h4>
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<div class="tablenoborder"><a name="rzadpfnexecd__tbexecd"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzadpfnexecd__tbexecd" width="100%" frame="hsides" border="1" rules="rows"><caption>Table 2. SQLExecDirect SQLSTATEs</caption><thead align="left"><tr><th align="left" valign="top" width="25%" id="d0e172">SQLSTATE</th>
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<th align="left" valign="top" width="25%" id="d0e174">Description</th>
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<th align="left" valign="top" width="50%" id="d0e176">Explanation</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="25%" headers="d0e172 "><strong>HY</strong>001</td>
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<td align="left" valign="top" width="25%" headers="d0e174 ">Memory allocation failure</td>
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<td align="left" valign="top" width="50%" headers="d0e176 ">The driver is unable to allocate memory required
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to support the processing or completion of the function.</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e172 "><strong>HY</strong>009</td>
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<td align="left" valign="top" width="25%" headers="d0e174 ">Argument value</td>
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<td align="left" valign="top" width="50%" headers="d0e176 ">The argument <em>szSqlStr</em> is a null pointer.
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<p>The argument <em>cbSqlStr</em> is less than 1, but not equal to SQL_NTS.</p>
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</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e172 "><strong>HY</strong>010</td>
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<td align="left" valign="top" width="25%" headers="d0e174 ">Function sequence error</td>
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<td align="left" valign="top" width="50%" headers="d0e176 ">Either no connection or there is an open
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cursor for this statement handle.</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e172 "><strong>HY</strong>013 <strong>*</strong></td>
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<td align="left" valign="top" width="25%" headers="d0e174 ">Memory management problem</td>
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<td align="left" valign="top" width="50%" headers="d0e176 ">The driver is unable to access memory required
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to support the processing or completion of the function.</td>
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</tr>
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<tr><td valign="top" width="25%" headers="d0e172 "><strong>HY</strong>021</td>
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<td valign="top" width="25%" headers="d0e174 ">Internal descriptor </td>
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<td valign="top" width="50%" headers="d0e176 ">The internal descriptor cannot be addressed or allocated,
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or it contains a value that is not valid.</td>
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</tr>
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<tr><td colspan="3" align="left" valign="top" headers="d0e172 d0e174 d0e176 "> <div class="note"><span class="notetitle">Note:</span> There
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are many other SQLSTATE values that can be generated by the Database Management
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System (DBMS), on processing of the statement.</div>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Example</h4></div>
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<div class="example" id="rzadpfnexecd__xmexecd"><a name="rzadpfnexecd__xmexecd"><!-- --></a><p>Refer to the <samp class="codeph">SQLFetch()</samp> <a href="rzadpfnfetch.htm#rzadpfnfetch__xmfetch">rzadpfnfetch.htm#rzadpfnfetch__xmfetch</a>.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">References</h4><ul><li><a href="rzadpfnexec.htm#rzadpfnexec">SQLExecute - Execute a statement</a></li>
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<li><a href="rzadpfnfetch.htm#rzadpfnfetch">SQLFetch - Fetch next row</a></li>
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<li><a href="rzadpfnspara.htm#rzadpfnspara">SQLSetParam - Set parameter</a></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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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzadphdapi.htm" title="This topic provides a description of each CLI function.">DB2 UDB CLI functions</a></div>
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</div>
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</div>
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</body>
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