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107 lines
7.6 KiB
HTML
107 lines
7.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Read a BLOB from the database</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.fbsql-read-blob" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">fbsql_read_blob</h1>
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<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">fbsql_read_blob</span> — <span class="dc-title">Read a BLOB from the database</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.fbsql-read-blob-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>fbsql_read_blob</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$blob_handle</code></span>
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[, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$link_identifier</code></span>
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] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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Reads BLOB data from the database.
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</p>
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<p class="para">
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If a select statement contains BLOB and/or CLOB columns FrontBase will
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return the data directly when data is fetched. This default behavior can
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be changed with <span class="function"><a href="fbsql_set_lob_mode.html" class="function">fbsql_set_lob_mode()</a></span> so the fetch
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functions will return handles to BLOB and CLOB data. If a handle is
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fetched a user must call <span class="function"><strong>fbsql_read_blob()</strong></span> to get the
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actual BLOB data from the database.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.fbsql-read-blob-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">blob_handle</code></dt>
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<dd>
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<p class="para">
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A BLOB handle, returned by <span class="function"><a href="fbsql_create_blob.html" class="function">fbsql_create_blob()</a></span>.
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</p>
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</dd>
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<dt>
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<code class="parameter">
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link_identifier</code></dt>
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<dd>
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<p class="para">由
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<span class="function"><a href="fbsql_connect.html" class="function">fbsql_connect()</a></span> 或
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<span class="function"><a href="fbsql_pconnect.html" class="function">fbsql_pconnect()</a></span> 返回的 FrontBase 链接标识符.</p>
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<p class="para">如可选并未指定，函数会尝试查找一个到 FrontBase 服务器的开放链接，且如没有找到这样的链接，会尝试通过不带参数调用 <span class="function"><a href="fbsql_connect.html" class="function">fbsql_connect()</a></span> 来创建一个。</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.fbsql-read-blob-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns a string containing the specified BLOB data.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.fbsql-read-blob-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-1225">
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<p><strong>Example #1 <span class="function"><strong>fbsql_read_blob()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">fbsql_pconnect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"_SYSTEM"</span><span style="color: #007700">, </span><span style="color: #DD0000">"secret"</span><span style="color: #007700">)<br /> or die(</span><span style="color: #DD0000">"Could not connect"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$sql </span><span style="color: #007700">= </span><span style="color: #DD0000">"SELECT BLOB_COLUMN FROM BLOB_TABLE;"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$rs </span><span style="color: #007700">= </span><span style="color: #0000BB">fbsql_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$sql</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$row_data </span><span style="color: #007700">= </span><span style="color: #0000BB">fbsql_fetch_row</span><span style="color: #007700">(</span><span style="color: #0000BB">$rs</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// $row_data[0] will now contain the blob data for the first row<br /></span><span style="color: #0000BB">fbsql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$rs</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$rs </span><span style="color: #007700">= </span><span style="color: #0000BB">fbsql_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$sql</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fbsql_set_lob_mode</span><span style="color: #007700">(</span><span style="color: #0000BB">$rs</span><span style="color: #007700">, </span><span style="color: #0000BB">FBSQL_LOB_HANDLE</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$row_data </span><span style="color: #007700">= </span><span style="color: #0000BB">fbsql_fetch_row</span><span style="color: #007700">(</span><span style="color: #0000BB">$rs</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// $row_data[0] will now contain a handle to the BLOB data in the first row<br /></span><span style="color: #0000BB">$blob_data </span><span style="color: #007700">= </span><span style="color: #0000BB">fbsql_read_blob</span><span style="color: #007700">(</span><span style="color: #0000BB">$row_data</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br /></span><span style="color: #0000BB">fbsql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$rs</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.fbsql-read-blob-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="fbsql_create_blob.html" class="function" rel="rdfs-seeAlso">fbsql_create_blob()</a> - Create a BLOB</span></li>
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<li class="member"><span class="function"><a href="fbsql_read_clob.html" class="function" rel="rdfs-seeAlso">fbsql_read_clob()</a> - Read a CLOB from the database</span></li>
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<li class="member"><span class="function"><a href="fbsql_set_lob_mode.html" class="function" rel="rdfs-seeAlso">fbsql_set_lob_mode()</a> - Set the LOB retrieve mode for a FrontBase result set</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |