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<html>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Returns the lengths of the columns of the current row in the result set</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.maxdb-fetch-lengths" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">maxdb_fetch_lengths</h1>
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<h1 class="refname">maxdb_result::lengths</h1>
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<p class="verinfo">(PECL maxdb >= 1.0)</p><p class="refpurpose"><span class="refname">maxdb_fetch_lengths</span> -- <span class="refname">maxdb_result::lengths</span> — <span class="dc-title">Returns the lengths of the columns of the current row in the result set</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.maxdb-fetch-lengths-description">
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<h3 class="title">说明</h3>
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<p class="para">过程化风格</p>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>maxdb_fetch_lengths</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
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) : <span class="type">array</span></div>
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<p class="para rdfs-comment">面向对象风格</p>
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<div class="fieldsynopsis"><span class="type">array</span> <var class="varname">$maxdb_result->lengths</var>;</div>
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<p class="para">
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The <span class="function"><strong>maxdb_fetch_lengths()</strong></span> function returns an array containing the
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lengths of every column of the current row within the result set represented by the
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<code class="parameter">result</code> parameter. If successful, a numerically indexed array
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representing the lengths of each column is returned 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 class="refsect1 returnvalues" id="refsect1-function.maxdb-fetch-lengths-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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An array of integers representing the size of each column (not including
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any terminating null characters). <strong><code>FALSE</code></strong> if an error occurred.
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</p>
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<p class="para">
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<span class="function"><strong>maxdb_fetch_lengths()</strong></span> is valid only for the current row of the result set.
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It returns <strong><code>FALSE</code></strong> if you call it before calling maxdb_fetch_row/array/resource or after retrieving
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all rows in the result.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.maxdb-fetch-lengths-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-1353">
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<p><strong>Example #1 面向对象风格</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 />$maxdb </span><span style="color: #007700">= new </span><span style="color: #0000BB">maxdb</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #0000BB">$query </span><span style="color: #007700">= </span><span style="color: #DD0000">"SELECT * from hotel.customer WHERE cno = 3000"</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #0000BB">$query</span><span style="color: #007700">)) {<br /><br /> </span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">fetch_row</span><span style="color: #007700">();<br /><br /> </span><span style="color: #FF8000">/* display column lengths */<br /> </span><span style="color: #007700">foreach (</span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">lengths </span><span style="color: #007700">as </span><span style="color: #0000BB">$i </span><span style="color: #007700">=> </span><span style="color: #0000BB">$val</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Field %2d has Length %2d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$i</span><span style="color: #007700">+</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">$val</span><span style="color: #007700">);<br /> }<br /> </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br />}<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<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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<div class="example" id="example-1354">
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<p><strong>Example #2 过程化风格</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 />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #0000BB">$query </span><span style="color: #007700">= </span><span style="color: #DD0000">"SELECT * from hotel.customer WHERE cno = 3000"</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #0000BB">$query</span><span style="color: #007700">)) {<br /><br /> </span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_fetch_row</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* display column lengths */<br /> </span><span style="color: #007700">foreach (</span><span style="color: #0000BB">maxdb_fetch_lengths</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">) as </span><span style="color: #0000BB">$i </span><span style="color: #007700">=> </span><span style="color: #0000BB">$val</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Field %2d has Length %2d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$i</span><span style="color: #007700">+</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">$val</span><span style="color: #007700">);<br /> }<br /> </span><span style="color: #0000BB">maxdb_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">maxdb_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<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 class="para">以上例程的输出类似于：</p>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Field 1 has Length 4
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Field 2 has Length 3
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Field 3 has Length 5
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Field 4 has Length 6
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Field 5 has Length 5
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Field 6 has Length 21
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</pre></div>
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</div>
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</div>
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</div></div></div></body></html> |