299 lines
14 KiB
HTML
299 lines
14 KiB
HTML
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<meta name="DC.Title" content="SQLGetCursorName - Get cursor name" />
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<title>SQLGetCursorName</title>
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<body id="rzadpfngcurn"><a name="rzadpfngcurn"><!-- --></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">SQLGetCursorName - Get cursor name</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">SQLGetCursorName()</samp> returns
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the cursor name associated with the input statement handle. If a cursor name
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is explicitly set by calling <samp class="codeph">SQLSetCursorName()</samp>, this name
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is returned; otherwise, an implicitly generated name is returned.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Syntax</h4><pre>SQLRETURN SQLGetCursorName (SQLHSTMT hstmt,
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SQLCHAR *szCursor,
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SQLSMALLINT cbCursorMax,
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SQLSMALLINT *pcbCursor);</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. SQLGetCursorName arguments</caption><thead align="left"><tr><th align="left" valign="top" width="20%" id="d0e51">Data type</th>
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<th align="left" valign="top" width="20%" id="d0e53">Argument</th>
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<th align="left" valign="top" width="20%" id="d0e55">Use</th>
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<th align="left" valign="top" width="40%" id="d0e57">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="d0e51 ">SQLCHAR *</td>
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<td align="left" valign="top" width="20%" headers="d0e53 "><em>szCursor</em></td>
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<td align="left" valign="top" width="20%" headers="d0e55 ">Output</td>
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<td align="left" valign="top" width="40%" headers="d0e57 ">Cursor name</td>
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</tr>
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<tr><td align="left" valign="top" width="20%" headers="d0e51 ">SQLHSTMT</td>
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<td align="left" valign="top" width="20%" headers="d0e53 "><em>hstmt</em></td>
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<td align="left" valign="top" width="20%" headers="d0e55 ">Input</td>
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<td align="left" valign="top" width="40%" headers="d0e57 ">Statement handle</td>
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</tr>
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<tr><td align="left" valign="top" width="20%" headers="d0e51 ">SQLSMALLINT *</td>
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<td align="left" valign="top" width="20%" headers="d0e53 "><em>pcbCursor</em></td>
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<td align="left" valign="top" width="20%" headers="d0e55 ">Output</td>
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<td align="left" valign="top" width="40%" headers="d0e57 ">Amount of bytes available to return for <em>szCursor</em></td>
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</tr>
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<tr><td align="left" valign="top" width="20%" headers="d0e51 ">SQLSMALLINT</td>
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<td align="left" valign="top" width="20%" headers="d0e53 "><em>cbCursorMax</em></td>
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<td align="left" valign="top" width="20%" headers="d0e55 ">Input</td>
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<td align="left" valign="top" width="40%" headers="d0e57 ">Length of buffer <em>szCursor</em></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><samp class="codeph">SQLGetCursorName()</samp> returns
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a cursor name if a name is set using <samp class="codeph">SQLSetCursorName()</samp> or
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if a SELECT statement is processed on the statement handle. If neither of
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these is true, then calling <samp class="codeph">SQLGetCusorName()</samp> results in
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an error.</p>
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<p>If a name is set explicitly using <samp class="codeph">SQLSetCursorName()</samp>,
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this name is returned until the statement is dropped, or until another explicit
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name is set.</p>
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<p>If an explicit name is not set, an implicit name is generated
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when a SELECT statement is processed, and this name is returned. Implicit
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cursor names always begin with SQLCUR.</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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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Diagnostics</h4>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="hsides" border="1" rules="rows"><caption>Table 2. SQLGetCursorName SQLSTATEs</caption><thead align="left"><tr><th align="left" valign="top" width="25%" id="d0e151">SQLSTATE</th>
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<th align="left" valign="top" width="25%" id="d0e153">Description</th>
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<th align="left" valign="top" width="50%" id="d0e155">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="d0e151 "><strong>01</strong>004</td>
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<td align="left" valign="top" width="25%" headers="d0e153 ">Data truncated</td>
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<td align="left" valign="top" width="50%" headers="d0e155 ">The cursor name returned in <em>szCursor</em> is
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longer than the value in <em>cbCursorMax</em>, and is truncated to <em>cbCursorMax</em> -
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1 bytes. The argument <em>pcbCursor</em> contains the length of the full cursor
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name available for return. The function returns SQL_SUCCESS_WITH_INFO.</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e151 "><strong>40</strong>003 <strong>*</strong></td>
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<td align="left" valign="top" width="25%" headers="d0e153 ">Statement completion unknown</td>
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<td align="left" valign="top" width="50%" headers="d0e155 ">The communication link between the CLI and
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the data source fails before the function completes processing.</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e151 "><strong>58</strong>004</td>
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<td align="left" valign="top" width="25%" headers="d0e153 ">System error</td>
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<td align="left" valign="top" width="50%" headers="d0e155 ">Unrecoverable system error.</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e151 "><strong>HY</strong>001</td>
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<td align="left" valign="top" width="25%" headers="d0e153 ">Memory allocation failure</td>
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<td align="left" valign="top" width="50%" headers="d0e155 ">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="d0e151 "><strong>HY</strong>009</td>
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<td align="left" valign="top" width="25%" headers="d0e153 ">Argument value that is not valid</td>
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<td align="left" valign="top" width="50%" headers="d0e155 ">The argument <em>szCursor</em> or <em>pcbCursor</em> is
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a null pointer. <p>The value specified for the argument <em>cbCursorMax</em> is
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less than 1.</p>
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</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e151 "><strong>HY</strong>010</td>
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<td align="left" valign="top" width="25%" headers="d0e153 ">Function sequence error</td>
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<td align="left" valign="top" width="50%" headers="d0e155 ">The statement <em>hstmt</em> is not in execute
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state. Call <samp class="codeph">SQLExecute()</samp>, <samp class="codeph">SQLExecDirect()</samp> or <samp class="codeph">SQLSetCursorName()</samp> before
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calling <samp class="codeph">SQLGetCursorName()</samp>.</td>
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</tr>
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<tr><td align="left" valign="top" width="25%" headers="d0e151 "><strong>HY</strong>013 <strong>*</strong></td>
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<td align="left" valign="top" width="25%" headers="d0e153 ">Memory management problem</td>
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<td align="left" valign="top" width="50%" headers="d0e155 ">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 align="left" valign="top" width="25%" headers="d0e151 "><strong>HY</strong>015</td>
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<td align="left" valign="top" width="25%" headers="d0e153 ">No cursor name available.</td>
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<td align="left" valign="top" width="50%" headers="d0e155 ">There is no open cursor on the <em>hstmt</em> and
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no cursor name has been set with <samp class="codeph">SQLSetCursorName()</samp>. The
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statement associated with <em>hstmt</em> does not support the use of a cursor.</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">Restrictions</h4><p>ODBC's generated cursor names start
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with SQL_CUR and X/Open CLI generated cursor names begin with SQLCUR. DB2<sup>®</sup> UDB
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CLI uses SQLCUR.</p>
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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="rzadpfngcurn__xmgcurn"><a name="rzadpfngcurn__xmgcurn"><!-- --></a><div class="p">Refer to <a href="rzadpxminter.htm#rzadpxminter">Example: Interactive SQL and the equivalent DB2 UDB CLI function calls</a>
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for a listing of the <samp class="codeph">check_error, initialize, and terminate</samp> functions
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used in the following example. <div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree
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to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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<pre>/*************************************************************************
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** file = getcurs.c
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**
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** Example of directly executing a SELECT and positioned UPDATE SQL statement.
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** Two statement handles are used, and SQLGetCursor is used to retrieve the
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** generated cursor name.
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**
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** Functions used:
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**
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** SQLAllocConnect SQLFreeConnect
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** SQLAllocEnv SQLFreeEnv
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** SQLAllocStmt SQLFreeStmt
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** SQLConnect SQLDisconnect
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**
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** SQLBindCol SQLFetch
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** SQLTransact SQLError
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** SQLExecDirect SQLGetCursorName
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**************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "sqlcli.h"
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#define MAX_STMT_LEN 255
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int initialize(SQLHENV *henv,
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SQLHDBC *hdbc);
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int terminate(SQLHENV henv,
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SQLHDBC hdbc);
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int print_error (SQLHENV henv,
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SQLHDBC hdbc,
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SQLHSTMT hstmt);
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int check_error (SQLHENV henv,
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SQLHDBC hdbc,
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SQLHSTMT hstmt,
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SQLRETURN frc);
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/*******************************************************************
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** main
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** - initialize
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** - terminate
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*******************************************************************/
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int main()
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{
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SQLHENV henv;
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SQLHDBC hdbc;
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SQLRETURN rc,
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rc2;
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rc = initialize(&henv, &hdbc);
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if (rc != SQL_SUCCESS) return(terminate(henv, hdbc));
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{SQLHSTMT hstmt1,
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hstmt2;
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SQLCHAR sqlstmt[]="SELECT name, job from staff for update of job";
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SQLCHAR updstmt[MAX_STMT_LEN + 1];
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SQLCHAR name[10],
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job[6],
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newjob[6],
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cursor[19];
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SQLINTEGER rlength, attr;
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SQLSMALLINT clength;
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rc = SQLAllocStmt(hdbc, &hstmt1);
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if (rc != SQL_SUCCESS )
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check_error (henv, hdbc, SQL_NULL_HSTMT, rc);
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/* make sure the statement is update-capable */
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attr = SQL_FALSE;
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rc = SQLSetStmtAttr(hstmt1,SQL_ATTR_FOR_FETCH_ONLY, &attr, 0);
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/* allocate second statement handle for update statement */
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rc2 = SQLAllocStmt(hdbc, &hstmt2);
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if (rc2 != SQL_SUCCESS )
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check_error (henv, hdbc, SQL_NULL_HSTMT, rc);
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rc = SQLExecDirect(hstmt1, sqlstmt, SQL_NTS);
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if (rc != SQL_SUCCESS )
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check_error (henv, hdbc, hstmt1, rc);
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/* Get Cursor of the SELECT statement's handle */
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rc = SQLGetCursorName(hstmt1, cursor, 19, &clength);
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if (rc != SQL_SUCCESS )
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check_error (henv, hdbc, hstmt1, rc);
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/* bind name to first column in the result set */
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rc = SQLBindCol(hstmt1, 1, SQL_CHAR, (SQLPOINTER) name, 10,
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&rlength);
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if (rc != SQL_SUCCESS )
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check_error (henv, hdbc, hstmt1, rc);
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/* bind job to second column in the result set */
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rc = SQLBindCol(hstmt1, 2, SQL_CHAR, (SQLPOINTER) job, 6,
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&rlength);
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if (rc != SQL_SUCCESS )
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check_error (henv, hdbc, hstmt1, rc);
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printf("Job Change for all clerks\n");
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while ((rc = SQLFetch(hstmt1)) == SQL_SUCCESS)
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{
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printf("Name: %-9.9s Job: %-5.5s \n", name, job);
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printf("Enter new job or return to continue\n");
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gets(newjob);
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if (newjob[0] != '\0')
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{
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sprintf( updstmt,
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"UPDATE staff set job = '%s' where current of %s",
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newjob, cursor);
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rc2 = SQLExecDirect(hstmt2, updstmt, SQL_NTS);
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if (rc2 != SQL_SUCCESS )
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check_error (henv, hdbc, hstmt2, rc);
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}
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}
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if (rc != SQL_NO_DATA_FOUND )
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check_error (henv, hdbc, hstmt1, rc);
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SQLFreeStmt(hstmt1, SQL_CLOSE);
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}
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printf("Commiting Transaction\n");
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rc = SQLTransact(henv, hdbc, SQL_COMMIT);
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if (rc != SQL_NO_DATA_FOUND )
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check_error (henv, hdbc, SQL_NULL_HSTMT, rc);
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terminate(henv, hdbc);
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return (0);
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}/* end main */</pre>
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</div>
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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="rzadpfnexecd.htm#rzadpfnexecd">SQLExecDirect - Execute a statement directly</a></li>
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<li><a href="rzadpfnscurn.htm#rzadpfnscurn">SQLSetCursorName - Set cursor name</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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