ex16_8c-example.html
来自「一个很好用的Linux/Unix下Oracle OCI开发接口封装库」· HTML 代码 · 共 98 行
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<hr><h1>ex16.c</h1> Example for selecting blob data into a file.
<p>
<div class="fragment"><pre><span class="comment">/* $Id: ex16_8c-example.html,v 1.1 2005/01/13 02:56:43 cvsroot 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#a0">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#a1">sqlo_stmt_handle_t</a> sth = <a class="code" href="group__constants.html#a5a49">SQLO_STH_INIT</a>;
<span class="keywordtype">int</span> k = key;
FILE * fp;
<a class="code" href="group__typedefs.html#a2">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="a0"></a><a class="code" href="group__complex.html#a0">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#a3a25">SQLO_SUCCESS</a> !=
(<a name="a1"></a><a class="code" href="group__complex.html#a3">sqlo_bind_by_pos</a>(sth, 1, <a class="code" href="group__constants.html#a6a56">SQLOT_INT</a>, &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#a3a25">SQLO_SUCCESS</a> != <a name="a2"></a><a class="code" href="group__lob.html#a0">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#a3a25">SQLO_SUCCESS</a> !=
(<a name="a3"></a><a class="code" href="group__complex.html#a5">sqlo_define_by_pos</a>(sth, 1, <a class="code" href="group__constants.html#a6a56">SQLOT_INT</a>, &k, <span class="keyword">sizeof</span>(k), 0, 0, 0)) ||
(<a class="code" href="group__complex.html#a5">sqlo_define_by_pos</a>(sth, 2, <a class="code" href="group__constants.html#a6a82">SQLOT_BLOB</a>, &loblp, 0, &ind, 0, 0))) {
<a name="a4"></a><a class="code" href="group__lob.html#a1">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="a5"></a><a class="code" href="group__complex.html#a8">sqlo_execute</a>(sth, 1);
<span class="keywordflow">if</span> ( 0 > status) {
<a class="code" href="group__lob.html#a1">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="a6"></a><a class="code" href="group__lob.html#a5">sqlo_lob_get_length</a>(dbh, loblp, &loblen);
<span class="keywordflow">if</span> ( 0 > status) {
<a class="code" href="group__lob.html#a1">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="a7"></a><a class="code" href="group__lob.html#a7">sqlo_lob_read_stream</a>(dbh, loblp, loblen, fp);
<span class="keywordflow">if</span> ( 0 > status) {
<a class="code" href="group__lob.html#a1">sqlo_free_lob_desc</a>(dbh, &loblp);
<a name="a8"></a><a class="code" href="group__easy.html#a13">sqlo_close</a>(sth);
error_exit(dbh, <span class="stringliteral">"sqlo_lob_read_stream"</span>);
}
fclose(fp);
<a class="code" href="group__lob.html#a1">sqlo_free_lob_desc</a>(dbh, &loblp);
<a class="code" href="group__easy.html#a13">sqlo_close</a>(sth);
<a name="a9"></a><a class="code" href="group__transactions.html#a1">sqlo_rollback</a>(dbh);
drop_blob_table(dbh);
<span class="keywordflow">return</span> (1);
}
<span class="comment">/* $Id */</span>
</pre></div><hr><address style="align: right;"><small>Generated on Thu Aug 14 18:02:53 2003 for libsqlora8 by
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