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171 lines
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HTML
171 lines
5.2 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>Handling of binary column data</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.odbc-binmode" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">odbc_binmode</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">odbc_binmode</span> — <span class="dc-title">Handling of binary column data</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.odbc-binmode-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>odbc_binmode</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result_id</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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Enables handling of binary column data. ODBC SQL types affected are
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<em>BINARY</em>, <em>VARBINARY</em>, and
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<em>LONGVARBINARY</em>.
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</p>
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<p class="para">
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When binary SQL data is converted to character C data, each byte
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(8 bits) of source data is represented as two ASCII characters.
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These characters are the ASCII character representation of the
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number in its hexadecimal form. For example, a binary
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<em>00000001</em> is converted to
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<em>"01"</em> and a binary <em>11111111</em>
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is converted to <em>"FF"</em>.
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<table class="doctable table">
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<caption><strong>LONGVARBINARY handling</strong></caption>
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<thead>
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<tr>
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<th>binmode</th>
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<th>longreadlen</th>
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<th>result</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td><strong><code>ODBC_BINMODE_PASSTHRU</code></strong></td>
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<td>0</td>
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<td>passthru</td>
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</tr>
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<tr>
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<td><strong><code>ODBC_BINMODE_RETURN</code></strong></td>
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<td>0</td>
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<td>passthru</td>
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</tr>
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<tr>
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<td><strong><code>ODBC_BINMODE_CONVERT</code></strong></td>
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<td>0</td>
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<td>passthru</td>
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</tr>
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<tr>
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<td><strong><code>ODBC_BINMODE_PASSTHRU</code></strong></td>
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<td>0</td>
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<td>passthru</td>
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</tr>
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<tr>
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<td><strong><code>ODBC_BINMODE_PASSTHRU</code></strong></td>
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<td>>0</td>
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<td>passthru</td>
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</tr>
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<tr>
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<td><strong><code>ODBC_BINMODE_RETURN</code></strong></td>
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<td>>0</td>
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<td>return as is</td>
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</tr>
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<tr>
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<td><strong><code>ODBC_BINMODE_CONVERT</code></strong></td>
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<td>>0</td>
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<td>return as char</td>
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</tr>
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</tbody>
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</table>
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</p>
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<p class="para">
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If <span class="function"><a href="odbc_fetch_into.html" class="function">odbc_fetch_into()</a></span> is used, passthru means that an
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empty string is returned for these columns.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.odbc-binmode-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">result_id</code></dt>
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<dd>
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<p class="para">
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The result identifier.
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</p>
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<p class="para">
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If <code class="parameter">result_id</code> is <em>0</em>, the
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settings apply as default for new results.
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<span class="simpara">
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Default for <em>longreadlen</em> is <em>4096</em> and
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<code class="parameter">mode</code> defaults to
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<em>ODBC_BINMODE_RETURN</em>. Handling of binary long
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columns is also affected by <span class="function"><a href="odbc_longreadlen.html" class="function">odbc_longreadlen()</a></span>.
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</span>
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</p></blockquote>
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</p>
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</dd>
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<dt>
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<code class="parameter">mode</code></dt>
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<dd>
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<p class="para">
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Possible values for <code class="parameter">mode</code> are:
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<ul class="itemizedlist">
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<li class="listitem">
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<span class="simpara">
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<strong><code>ODBC_BINMODE_PASSTHRU</code></strong>: Passthru BINARY data
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>ODBC_BINMODE_RETURN</code></strong>: Return as is
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>ODBC_BINMODE_CONVERT</code></strong>: Convert to char and return
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</span>
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</li>
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</ul>
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</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.odbc-binmode-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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</div></div></div></body></html> |