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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>OCILIB (C Driver for Oracle): Oracle Rowids</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.4 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="modules.html"><span>Modules</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li><a href="files.html"><span>Files</span></a></li> </ul></div><h1>Oracle Rowids</h1>OCILIB supports the Oracle ROWID type through C scalar string types (dtext).<p><ul><li>ROWIDs can be retrieved from resultset with <a class="el" href="group__g__fetch.html#g755a9b07c174feacd05c86e0e44b0ab0" title="Return the current string value of the column at the given index in the resultset...">OCI_GetString()</a></li><li>ROWIDs can be binded to statements with <a class="el" href="group__g__bind.html#g49988b9ca8f00b55cc3e62ca2385778b" title="Bind a string variable.">OCI_BindString()</a></li></ul><p>The maximum size of an ROWID buffer is defined by the constant OCI_SIZE_ROWID<p><dl class="user" compact><dt><b>Example</b></dt><dd><div class="fragment"><pre class="fragment"><span class="preprocessor">#include "ocilib.h"</span><span class="keywordtype">int</span> main(){ <a class="code" href="struct_o_c_i___connection.html" title="Oracle physical connection.">OCI_Connection</a> *cn; <a class="code" href="struct_o_c_i___statement.html" title="Oracle SQL or PL/SQL statement.">OCI_Statement</a> *st1, *st2; <a class="code" href="struct_o_c_i___resultset.html" title="Collection of output columns from a select statement.">OCI_Resultset</a> *rs; <span class="keywordtype">char</span> rowid[OCI_SIZE_ROWID+1]; <span class="keywordtype">int</span> value; <span class="keywordflow">if</span> (!<a class="code" href="group__g__init.html#gcdb642d75f7c8478e083634144bc813c" title="Initializes the library.">OCI_Initialize</a>(NULL, NULL, OCI_ENV_DEFAULT)) <span class="keywordflow">return</span> EXIT_FAILURE; cn = <a class="code" href="group__g__connect.html#gdb6e2cdf759587dd81c2fda7c5f44338" title="Create a physical connection to an Oracle database server.">OCI_ConnectionCreate</a>(<span class="stringliteral">"db"</span>, <span class="stringliteral">"usr"</span>, pwd<span class="stringliteral">", OCI_SESSION_DEFAULT);</span><span class="stringliteral"> </span><span class="stringliteral"> st1 = OCI_CreateStatement(cn);</span><span class="stringliteral"> st2 = OCI_CreateStatement(cn);</span><span class="stringliteral"></span><span class="stringliteral"> OCI_Prepare(st1, "</span>update test_fetch <span class="keyword">set</span> code = :i where rowid = :s<span class="stringliteral">");</span><span class="stringliteral"> OCI_BindInt(st1, "</span>:i<span class="stringliteral">", &value);</span><span class="stringliteral"> OCI_BindString(st1, "</span>:s<span class="stringliteral">", rowid, sizeof(rowid)-1);</span><span class="stringliteral"></span><span class="stringliteral"> OCI_ExecuteStmt(st2, "</span>select code, rowid from test_fetch <span class="keywordflow">for</span> update<span class="stringliteral">");</span><span class="stringliteral"></span><span class="stringliteral"> rs = OCI_GetResultset(st2);</span><span class="stringliteral"></span><span class="stringliteral"> while (OCI_FetchNext(rs))</span><span class="stringliteral"> {</span><span class="stringliteral"> value = OCI_GetInt(rs, 1);</span><span class="stringliteral"> strcpy(rowid, OCI_GetString(rs, 2));</span><span class="stringliteral"> </span><span class="stringliteral"> /* updating value with some computation ... */</span><span class="stringliteral"> value = (value + 4 ) % 2;</span><span class="stringliteral"></span><span class="stringliteral"> OCI_Execute(st1);</span><span class="stringliteral"> }</span><span class="stringliteral"></span><span class="stringliteral"> OCI_Commit(cn);</span><span class="stringliteral"></span><span class="stringliteral"> OCI_Cleanup():</span><span class="stringliteral"></span><span class="stringliteral"> return EXIT_SUCCESS;</span><span class="stringliteral">}</span></pre></div> </dd></dl><p><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr></table><hr size="1"><address style="text-align: right;"><small>Generated on Thu Oct 9 10:07:47 2008 for OCILIB (C Driver for Oracle) by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.4 </small></address></body></html>⌨️ 快捷键说明
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