group__lob.html

Linux下的操作oracle数据库的连接库

SQLO_STILL_EXECUTING </li>
<li>
SQLO_ERROR </li>
</ul>
</dd></dl>
<dl compact><dt><b>Since:</b></dt><dd>Version 2.2 </dd></dl>
<dl compact><dt><b>Example:</b></dt><dd><div class="fragment"><pre><span class="comment">/* $Id: ex15.c,v 1.6 2004/01/03 16:48:19 kpoitschke Exp $ */</span>
<span class="preprocessor">#include &lt;stdio.h&gt;</span>
<span class="preprocessor">#include &lt;stdlib.h&gt;</span>
<span class="preprocessor">#include &lt;string.h&gt;</span>
<span class="preprocessor">#include "examples.h"</span>

<span class="keywordtype">int</span> select_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="keywordtype">char</span> * stmt = 
    <span class="stringliteral">"SELECT KEY, CDATA 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;
  <span class="keywordtype">char</span> * data;
  <span class="keywordtype">short</span> ind;
  <span class="keywordtype">char</span> cmp_data[MAX_BLOB_BUFFER_DATA];        <span class="comment">/* our buffer to compare the result */</span>
  <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;

  printf(<span class="stringliteral">"Query CLOB\n"</span>);

  fillbuf2(cmp_data, MAX_BLOB_BUFFER_DATA); <span class="comment">/* our reference data */</span>

  <span class="comment">/* parse */</span>
  <span class="keywordflow">if</span> (0 &gt; (sth = <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 class="code" href="group__complex.html#ga190">sqlo_bind_by_pos</a>(sth, 1, SQLOT_INT, &amp;k, <span class="keyword">sizeof</span>(k), 0, 0))) {
      error_exit(dbh, <span class="stringliteral">"sqlo_bind_by_pos"</span>);
    }
      
  <span class="comment">/* allocate a lob descriptor */</span>
  <span class="keywordflow">if</span> (0 &gt; <a class="code" href="group__lob.html#ga205">sqlo_alloc_lob_desc</a>(dbh, &amp;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 class="code" href="group__complex.html#ga192">sqlo_define_by_pos</a>(sth, 1, SQLOT_INT, &amp;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_CLOB, &amp;loblp, 0, &amp;ind, 0, 0))) {

      <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &amp;loblp);
      error_exit(dbh, <span class="stringliteral">"sqlo_define_by_pos2"</span>);
    }      

  <span class="comment">/* execute */</span>
  status = <a class="code" href="group__complex.html#ga194">sqlo_execute</a>(sth, 1);

  <span class="keywordflow">if</span> (<a class="code" href="group__constants.html#gga3a25">SQLO_SUCCESS</a> != status)  {
    <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &amp;loblp);
    error_exit(dbh, <span class="stringliteral">"sqlo_execute"</span>);
  }

  <span class="keywordflow">if</span> (ind != <a class="code" href="group__constants.html#gga5a47">SQLO_NULL_IND</a>) 
    {
      status = <a class="code" href="group__lob.html#ga210">sqlo_lob_get_length</a>(dbh, loblp, &amp;loblen);

      <span class="keywordflow">if</span> ( 0 &gt; status) {
        <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &amp;loblp);
        error_exit(dbh, <span class="stringliteral">"sqlo_free_lob_desc"</span>);
      }

      <span class="keywordflow">if</span> (loblen != MAX_BLOB_BUFFER_DATA) {
        printf(<span class="stringliteral">"Invalid LOB size. Expected %d, got %d\n"</span>, MAX_BLOB_BUFFER_DATA,
               loblen);
        <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &amp;loblp);
        <a class="code" href="group__easy.html#ga172">sqlo_close</a>(sth);
        <span class="keywordflow">return</span> 0;
      }

      <span class="comment">/* allocate the buffer for the data */</span>
      data = malloc(loblen * <span class="keyword">sizeof</span>(<span class="keywordtype">char</span>));
      <span class="keywordflow">if</span> (!data) {
          printf(<span class="stringliteral">"FATAL: malloc error at %d\n"</span>, __LINE__);
          <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &amp;loblp);
          exit(EXIT_FAILURE);
      }

      <span class="comment">/* read the data into the buffer */</span>
      status = <a class="code" href="group__lob.html#ga211">sqlo_lob_read_buffer</a>(dbh, loblp, loblen, data, loblen);

      <span class="keywordflow">if</span> ( 0 &gt; status)  {
          printf(<span class="stringliteral">"sqlo_lob_read_buffer failed: %s\n"</span>, <a class="code" href="group__error.html#ga158">sqlo_geterror</a>(dbh) );
          <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &amp;loblp);
          error_exit(dbh, <span class="stringliteral">"sqlo_lob_read_buffer"</span>);
        }

      printf(<span class="stringliteral">"Compare CLOB\n"</span>);
      <span class="comment">/* compare with our reference data */</span>
      <span class="keywordflow">if</span> (memcmp(data, &amp;cmp_data, MAX_BLOB_BUFFER_DATA)) {
        <span class="keywordtype">int</span> i;
        printf(<span class="stringliteral">"LOB read is different from LOB written\n"</span>);
        <span class="keywordflow">for</span> (i = 0; i &lt;= MAX_BLOB_BUFFER_DATA; ++i) {
          <span class="keywordflow">if</span> (data[i] != cmp_data[i])
            printf(<span class="stringliteral">"diff at pos %d\n"</span>, i);
        }
      }

    } <span class="keywordflow">else</span> {
      printf(<span class="stringliteral">"LOB is NULL\n"</span>);
      <span class="keywordflow">return</span> 0;
    }

  <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &amp;loblp);
  <a class="code" href="group__easy.html#ga172">sqlo_close</a>(sth);

  <span class="keywordflow">return</span> (1);

}

<span class="comment">/* $Id */</span>
</pre></div> </dd></dl>

<p>
Definition at line <a class="el" href="sqlora_8c-source.html#l07726">7726</a> of file <a class="el" href="sqlora_8c-source.html">sqlora.c</a>.
<p>
References <a class="el" href="sqlora_8c-source.html#l04319">_get_trace_fp()</a>, <a class="el" href="sqlora_8c-source.html#l00340">CHECK_DBHANDLE</a>, <a class="el" href="sqlora_8c-source.html#l00416">CHECK_OCI_STATUS_RETURN</a>, <a class="el" href="sqlora_8c-source.html#l00483">_sqlo_db_struct::errhp</a>, <a class="el" href="sqlora_8c.html#a30">sqlo_db_struct_ptr_t</a>, <a class="el" href="group__constants.html#gga4a34">SQLO_INVALID_DB_HANDLE</a>, <a class="el" href="sqlora_8c-source.html#l00493">_sqlo_db_struct::status</a>, <a class="el" href="sqlora_8c-source.html#l00485">_sqlo_db_struct::svchp</a>, and <a class="el" href="sqlora_8c-source.html#l00238">TRACE</a>.
<p>
Referenced by <a class="el" href="sqlora_8c-source.html#l07770">sqlo_lob_read_stream()</a>.    </td>
  </tr>
</table>

<p>
Here is the call graph for this function:<p><center><img src="group__lob_ga6_cgraph.png" border="0" usemap="#group__lob_ga6_cgraph_map" alt=""></center>
<map name="group__lob_ga6_cgraph_map">
<area href="sqlora_8c.html#a128" shape="rect" coords="207,5,303,23" alt="">
</map>
<a class="anchor" name="ga7" doxytag="sqlora.h::sqlo_lob_read_stream" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
  <tr>
    <td class="mdRow">
      <table cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td class="md" nowrap valign="top"> int sqlo_lob_read_stream </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="group__typedefs.html#ga0">sqlo_db_handle_t</a>&nbsp;</td>
          <td class="mdname" nowrap> <em>dbh</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td></td>
          <td class="md" nowrap><a class="el" href="group__typedefs.html#ga2">sqlo_lob_desc_t</a>&nbsp;</td>
          <td class="mdname" nowrap> <em>loblp</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td></td>
          <td class="md" nowrap>unsigned int&nbsp;</td>
          <td class="mdname" nowrap> <em>loblen</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td></td>
          <td class="md" nowrap>FILE *&nbsp;</td>
          <td class="mdname" nowrap> <em>fp</em></td>
        </tr>
        <tr>
          <td></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"></td>
        </tr>

      </table>
    </td>
  </tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
  <tr>
    <td>
      &nbsp;
    </td>
    <td>

<p>
Read lob data from lob column into a stream. 
<p>
Use <a class="el" href="group__lob.html#ga5">sqlo_lob_get_length</a> to get the loblen you have to use here.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign=top><em>dbh</em>&nbsp;</td><td>I - A database handle. </td></tr>
    <tr><td valign=top><em>loblp</em>&nbsp;</td><td>I - A lob locator. </td></tr>
    <tr><td valign=top><em>loblen</em>&nbsp;</td><td>I - The length of the lob </td></tr>
    <tr><td valign=top><em>fp</em>&nbsp;</td><td>I - A filepointer</td></tr>
  </table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd><ul>
<li>
SQLO_SUCCESS </li>
<li>
SQLO_STILL_EXECUTING </li>
<li>
SQLO_ERROR </li>
</ul>
</dd></dl>
<dl compact><dt><b>Since:</b></dt><dd>Version 2.2</dd></dl>
<dl compact><dt><b>Example:</b></dt><dd><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 &lt;stdio.h&gt;</span>
<span class="preprocessor">#include &lt;stdlib.h&gt;</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 &gt; (sth = <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 class="code" href="group__complex.html#ga190">sqlo_bind_by_pos</a>(sth, 1, SQLOT_INT, &amp;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 class="code" href="group__lob.html#ga205">sqlo_alloc_lob_desc</a>(dbh, &amp;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 class="code" href="group__complex.html#ga192">sqlo_define_by_pos</a>(sth, 1, SQLOT_INT, &amp;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, &amp;loblp, 0, &amp;ind, 0, 0))) {
    <a class="code" href="group__lob.html#ga206">sqlo_free_lob_desc</a>(dbh, &amp;loblp);
    error_exit(dbh, <span class="stringliteral">"sqlo_define_by_pos2"</span>);
  }