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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=iso-8859-1"><title>libsqlora8: Example Documentation</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.6 --><div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a> | <a class="qindex" href="pages.html">Related Pages</a> | <a class="qindex" href="examples.html">Examples</a></div><h1>ex16.c</h1>Example for selecting blob data into a file. <div class="fragment"><pre><span class="comment">/* $Id: ex16.c,v 1.4 2002/08/24 12:54:47 kpoitschke Exp $ */</span><span class="preprocessor">#include <stdio.h></span><span class="preprocessor">#include <stdlib.h></span><span class="preprocessor">#include "examples.h"</span><span class="keywordtype">int</span> select_file_from_blob_table(<a class="code" href="group__typedefs.html#ga0">sqlo_db_handle_t</a> dbh, <span class="keywordtype">int</span> key, <span class="keyword">const</span> <span class="keywordtype">char</span> *fname ){ <span class="keywordtype">char</span> * stmt = <span class="stringliteral">"SELECT KEY, BDATA FROM T_SQLORA_BLOB WHERE KEY = :1"</span>; <span class="keywordtype">int</span> status; <a class="code" href="group__typedefs.html#ga1">sqlo_stmt_handle_t</a> sth = <a class="code" href="group__constants.html#gga5a49">SQLO_STH_INIT</a>; <span class="keywordtype">int</span> k = key; FILE * fp; <a class="code" href="group__typedefs.html#ga2">sqlo_lob_desc_t</a> loblp; <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> loblen; <span class="keywordtype">short</span> ind; <span class="keywordflow">if</span> (!(fp = fopen(fname, <span class="stringliteral">"w"</span>))) { printf(<span class="stringliteral">"ERROR: Cannot open %s for write\n"</span>, fname); <span class="keywordflow">return</span> 0; } <span class="comment">/* parse */</span> <span class="keywordflow">if</span> (0 > (sth = <a name="a37"></a><a class="code" href="group__complex.html#ga186">sqlo_prepare</a>(dbh, stmt))) error_exit(dbh, <span class="stringliteral">"sqlo_prepare"</span>); <span class="comment">/* bind input */</span> <span class="keywordflow">if</span> (<a class="code" href="group__constants.html#gga3a25">SQLO_SUCCESS</a> != (<a name="a38"></a><a class="code" href="group__complex.html#ga190">sqlo_bind_by_pos</a>(sth, 1, SQLOT_INT, &k, <span class="keyword">sizeof</span>(k), 0, 0))) error_exit(dbh, <span class="stringliteral">"sqlo_bind_by_pos"</span>); <span class="comment">/* alloc lob desc */</span> <span class="keywordflow">if</span> (<a class="code" href="group__constants.html#gga3a25">SQLO_SUCCESS</a> != <a name="a39"></a><a class="code" href="group__lob.html#ga205">sqlo_alloc_lob_desc</a>(dbh, &loblp)) error_exit(dbh, <span class="stringliteral">"sqlo_alloc_lob_desc"</span>); <span class="comment">/* define output */</span> <span class="keywordflow">if</span> (<a class="code" href="group__constants.html#gga3a25">SQLO_SUCCESS</a> != (<a name="a40"></a><a class="code" href="group__complex.html#ga192">sqlo_define_by_pos</a>(sth, 1, SQLOT_INT, &k, <span class="keyword">sizeof</span>(k), 0, 0, 0)) || (<a class="code" href="group__complex.html#ga192">sqlo_define_by_pos</a>(sth, 2, SQLOT_BLOB, &loblp, 0, &ind, 0, 0))) { <a name="a41"></a><a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &loblp); error_exit(dbh, <span class="stringliteral">"sqlo_define_by_pos2"</span>); } <span class="comment">/* execute */</span> status = <a name="a42"></a><a class="code" href="group__complex.html#ga194">sqlo_execute</a>(sth, 1); <span class="keywordflow">if</span> ( 0 > status) { <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &loblp); error_exit(dbh, <span class="stringliteral">"sqlo_execute"</span>); } <span class="comment">/* get the LOB length */</span> status = <a name="a43"></a><a class="code" href="group__lob.html#ga210">sqlo_lob_get_length</a>(dbh, loblp, &loblen); <span class="keywordflow">if</span> ( 0 > status) { <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &loblp); error_exit(dbh, <span class="stringliteral">"sqlo_log_get_length"</span>); } <span class="comment">/* write it to the file */</span> status = <a name="a44"></a><a class="code" href="group__lob.html#ga212">sqlo_lob_read_stream</a>(dbh, loblp, loblen, fp); <span class="keywordflow">if</span> ( 0 > status) { <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &loblp); <a name="a45"></a><a class="code" href="group__easy.html#ga172">sqlo_close</a>(sth); error_exit(dbh, <span class="stringliteral">"sqlo_lob_read_stream"</span>); } fclose(fp); <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &loblp); <a class="code" href="group__easy.html#ga172">sqlo_close</a>(sth); <a name="a46"></a><a class="code" href="group__transactions.html#ga184">sqlo_rollback</a>(dbh); drop_blob_table(dbh); <span class="keywordflow">return</span> (1);}<span class="comment">/* $Id */</span></pre></div> <hr size="1"><address style="align: right;"><small>Generated on Sun Jun 13 04:51:41 2004 for libsqlora8 by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.6 </small></address></body></html>⌨️ 快捷键说明
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