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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>Gets the number of affected rows in a previous MaxDB operation</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-affected-rows" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">maxdb_affected_rows</h1>
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<h1 class="refname">maxdb::affected_rows</h1>
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<p class="verinfo">(PECL maxdb >= 1.0)</p><p class="refpurpose"><span class="refname">maxdb_affected_rows</span> -- <span class="refname">maxdb::affected_rows</span> — <span class="dc-title">Gets the number of affected rows in a previous MaxDB operation</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.maxdb-affected-rows-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_affected_rows</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$link</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">面向对象风格</p>
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<div class="fieldsynopsis"><span class="type">int</span> <var class="varname">$maxdb->affected_rows</var>;</div>
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<p class="para">
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<span class="function"><strong>maxdb_affected_rows()</strong></span> returns the number of rows affected by the last
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INSERT, UPDATE, or DELETE query associated with the provided <code class="parameter">link</code>
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parameter. If this number cannot be determined, this function will return -1.
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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For SELECT statements <span class="function"><strong>maxdb_affected_rows()</strong></span> works like
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<span class="function"><a href="maxdb_num_rows.html" class="function">maxdb_num_rows()</a></span>.
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</p>
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</p></blockquote>
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<p class="para">
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The <span class="function"><strong>maxdb_affected_rows()</strong></span> function only works with queries which modify
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a table. In order to return the number of rows from a SELECT query, use the
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<span class="function"><a href="maxdb_num_rows.html" class="function">maxdb_num_rows()</a></span> function instead.
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.maxdb-affected-rows-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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An integer greater than zero indicates the number of rows affected or retrieved.
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Zero indicates that no records where updated for an UPDATE statement, no rows matched
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the WHERE clause in the query or that no query has yet been executed.
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-1 indicates that the number of rows affected can not be determined.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.maxdb-affected-rows-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-1322">
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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 />$maxdb </span><span style="color: #007700">= new </span><span style="color: #0000BB">maxdb</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #0000BB">maxdb_report </span><span style="color: #007700">(</span><span style="color: #0000BB">MAXDB_REPORT_OFF</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"DROP TABLE mycustomer"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">maxdb_report </span><span style="color: #007700">(</span><span style="color: #0000BB">MAXDB_REPORT_ERROR</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Insert rows */<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"CREATE TABLE mycustomer AS SELECT * from hotel.customer"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Affected rows (INSERT): %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">affected_rows</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"ALTER TABLE mycustomer ADD Status int default 0"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* update rows */<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"UPDATE mycustomer SET Status=1 WHERE cno > 50"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Affected rows (UPDATE): %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">affected_rows</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* delete rows */<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"DELETE FROM mycustomer WHERE cno < 50"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Affected rows (DELETE): %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">affected_rows</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* select all rows */<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT title FROM mycustomer"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Affected rows (SELECT): %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">affected_rows</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">/* Delete table Language */<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"DROP TABLE mycustomer"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-1323">
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<p><strong>Example #2 过程化风格</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$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 />if (!</span><span style="color: #0000BB">$link</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Can't connect to localhost. Error: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #0000BB">maxdb_report </span><span style="color: #007700">(</span><span style="color: #0000BB">MAXDB_REPORT_OFF</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">,</span><span style="color: #DD0000">"DROP TABLE mycustomer"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">maxdb_report </span><span style="color: #007700">(</span><span style="color: #0000BB">MAXDB_REPORT_ERROR</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Insert rows */<br /></span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"CREATE TABLE mycustomer AS SELECT * from hotel.customer"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Affected rows (INSERT): %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_affected_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"ALTER TABLE mycustomer ADD Status int default 0"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* update rows */<br /></span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"UPDATE mycustomer SET Status=1 WHERE cno > 50"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Affected rows (UPDATE): %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_affected_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">/* delete rows */<br /></span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"DELETE FROM mycustomer WHERE cno < 50"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Affected rows (DELETE): %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_affected_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">/* select all rows */<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT title FROM mycustomer"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Affected rows (SELECT): %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_affected_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</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">$result</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Delete table Language */<br /></span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"DROP TABLE mycustomer"</span><span style="color: #007700">);<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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Affected rows (INSERT): 15
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Affected rows (UPDATE): 15
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Affected rows (DELETE): 0
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Affected rows (SELECT): 15
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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-affected-rows-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_num_rows.html" class="function" rel="rdfs-seeAlso">maxdb_num_rows()</a> - Gets the number of rows in a result</span></li>
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<li class="member"><span class="function"><a href="maxdb_info.html" class="function" rel="rdfs-seeAlso">maxdb_info()</a> - Retrieves information about the most recently executed query</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> |