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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>Performs a query on 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.maxdb-query" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">maxdb_query</h1>
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<h1 class="refname">maxdb::query</h1>
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<p class="verinfo">(PECL maxdb >= 1.0)</p><p class="refpurpose"><span class="refname">maxdb_query</span> -- <span class="refname">maxdb::query</span> — <span class="dc-title">Performs a query on the database</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.maxdb-query-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_query</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$link</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$resultmode</code></span>
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] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">面向对象风格</p>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>maxdb::query</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
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) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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The <span class="function"><strong>maxdb_query()</strong></span> function is used to simplify the
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act of performing a query against the database represented by the
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<code class="parameter">link</code> parameter.
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.maxdb-query-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>。 For <em>SELECT, SHOW, DESCRIBE</em> or
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<em>EXPLAIN</em> <span class="function"><strong>maxdb_query()</strong></span> will return
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a result resource.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.maxdb-query-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-1391">
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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 />$maxdb </span><span style="color: #007700">= new </span><span style="color: #0000BB">maxdb</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #FF8000">/* Create table doesn't return a resultset */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"CREATE TABLE temp.mycity LIKE hotel.city"</span><span style="color: #007700">) === </span><span style="color: #0000BB">TRUE</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Table mycity successfully created.\n"</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* Select queries return a resultset */<br /></span><span style="color: #007700">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: #DD0000">"SELECT name FROM hotel.city"</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Select returned %d rows.\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">num_rows</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* free result set */<br /> </span><span style="color: #0000BB">$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">/* If we have to retrieve large amount of data we use MAXDB_USE_RESULT */<br /></span><span style="color: #007700">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: #DD0000">"SELECT * FROM hotel.city"</span><span style="color: #007700">, </span><span style="color: #0000BB">MAXDB_USE_RESULT</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br />}<br /><br /></span><span style="color: #0000BB">$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-1392">
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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 />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #FF8000">/* Create table doesn't return a resultset */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"CREATE TABLE temp.mycity LIKE hotel.city"</span><span style="color: #007700">) === </span><span style="color: #0000BB">TRUE</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Table mycity successfully created.\n"</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* Select queries return a resultset */<br /></span><span style="color: #007700">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: #DD0000">"SELECT name FROM hotel.city"</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Select returned %d rows.\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">));<br /><br /> </span><span style="color: #FF8000">/* free result set */<br /> </span><span style="color: #0000BB">maxdb_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* If we have to retrieve large amount of data we use MAXDB_USE_RESULT */<br /></span><span style="color: #007700">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: #DD0000">"SELECT * FROM hotel.city"</span><span style="color: #007700">, </span><span style="color: #0000BB">MAXDB_USE_RESULT</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">maxdb_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">maxdb_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$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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Table mycity successfully created.
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Select returned 25 rows.
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</pre></div>
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</div>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.maxdb-query-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="maxdb_real_query.html" class="function" rel="rdfs-seeAlso">maxdb_real_query()</a> - Execute an SQL query</span></li>
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<li class="member"><span class="function"><a href="maxdb_multi_query.html" class="function" rel="rdfs-seeAlso">maxdb_multi_query()</a> - Performs a query on the database</span></li>
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<li class="member"><span class="function"><a href="maxdb_free_result.html" class="function" rel="rdfs-seeAlso">maxdb_free_result()</a> - Frees the memory associated with a result</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> |