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98 lines
8.9 KiB
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<!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>Decode binary data passed as parameters to an UDF</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.sqlite-udf-decode-binary" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">sqlite_udf_decode_binary</h1>
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<p class="verinfo">(PHP 5 < 5.4.0, PECL sqlite >= 1.0.0)</p><p class="refpurpose"><span class="refname">sqlite_udf_decode_binary</span> — <span class="dc-title">Decode binary data passed as parameters to an <acronym title="User Defined Functions">UDF</acronym></span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.sqlite-udf-decode-binary-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>sqlite_udf_decode_binary</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</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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Decodes binary data passed as parameters to a <acronym title="User Defined Functions">UDF</acronym>.
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</p>
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<p class="para">
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You must call this function on parameters passed to your UDF if you need
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them to handle binary data, as the binary encoding employed by PHP will
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obscure the content and of the parameter in its natural, non-coded form.
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</p>
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<p class="para">
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PHP does not perform this encode/decode operation automatically as it would
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severely impact performance if it did.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.sqlite-udf-decode-binary-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">data</code></dt>
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<dd>
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<p class="para">
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The encoded data that will be decoded, data that was applied by either
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<span class="function"><a href="sqlite_udf_encode_binary.html" class="function">sqlite_udf_encode_binary()</a></span> or
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<span class="function"><a href="sqlite_escape_string.html" class="function">sqlite_escape_string()</a></span>.
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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.sqlite-udf-decode-binary-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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The decoded <span class="type"><a href="language.types.string.html" class="type string">string</a></span>.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.sqlite-udf-decode-binary-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-2546">
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<p><strong>Example #1 binary-safe max_length aggregation function 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 />$data </span><span style="color: #007700">= array(<br /> </span><span style="color: #DD0000">'one'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'two'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'three'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'four'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'five'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'six'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'seven'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'eight'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'nine'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'ten'</span><span style="color: #007700">,<br /> );<br /></span><span style="color: #0000BB">$db </span><span style="color: #007700">= </span><span style="color: #0000BB">sqlite_open</span><span style="color: #007700">(</span><span style="color: #DD0000">':memory:'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">sqlite_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$db</span><span style="color: #007700">, </span><span style="color: #DD0000">"CREATE TABLE strings(a)"</span><span style="color: #007700">);<br />foreach (</span><span style="color: #0000BB">$data </span><span style="color: #007700">as </span><span style="color: #0000BB">$str</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$str </span><span style="color: #007700">= </span><span style="color: #0000BB">sqlite_escape_string</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">sqlite_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$db</span><span style="color: #007700">, </span><span style="color: #DD0000">"INSERT INTO strings VALUES ('</span><span style="color: #0000BB">$str</span><span style="color: #DD0000">')"</span><span style="color: #007700">);<br />}<br /><br />function </span><span style="color: #0000BB">max_len_step</span><span style="color: #007700">(&</span><span style="color: #0000BB">$context</span><span style="color: #007700">, </span><span style="color: #0000BB">$string</span><span style="color: #007700">) <br />{<br /> </span><span style="color: #0000BB">$string </span><span style="color: #007700">= </span><span style="color: #0000BB">sqlite_udf_decode_binary</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">);<br /> if (</span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">) > </span><span style="color: #0000BB">$context</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$context </span><span style="color: #007700">= </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">);<br /> }<br />}<br /><br />function </span><span style="color: #0000BB">max_len_finalize</span><span style="color: #007700">(&</span><span style="color: #0000BB">$context</span><span style="color: #007700">) <br />{<br /> return </span><span style="color: #0000BB">$context</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">sqlite_create_aggregate</span><span style="color: #007700">(</span><span style="color: #0000BB">$db</span><span style="color: #007700">, </span><span style="color: #DD0000">'max_len'</span><span style="color: #007700">, </span><span style="color: #DD0000">'max_len_step'</span><span style="color: #007700">, </span><span style="color: #DD0000">'max_len_finalize'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">sqlite_array_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$db</span><span style="color: #007700">, </span><span style="color: #DD0000">'SELECT max_len(a) from strings'</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.sqlite-udf-decode-binary-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="sqlite_udf_encode_binary.html" class="function" rel="rdfs-seeAlso">sqlite_udf_encode_binary()</a> - Encode binary data before returning it from an UDF</span></li>
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<li class="member"><span class="function"><a href="sqlite_create_function.html" class="function" rel="rdfs-seeAlso">sqlite_create_function()</a> - Registers a "regular" User Defined Function for use in SQL statements</span></li>
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<li class="member"><span class="function"><a href="sqlite_create_aggregate.html" class="function" rel="rdfs-seeAlso">sqlite_create_aggregate()</a> - Register an aggregating UDF for use in SQL statements</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> |