function.pg-send-query.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Sends asynchronous query</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pg-send-query-params.html">pg_send_query_params</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pg-set-client-encoding.html">pg_set_client_encoding</a></div> <div class="up"><a href="ref.pgsql.html">PostgreSQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.pg-send-query" class="refentry"> <div class="refnamediv"> <h1 class="refname">pg_send_query</h1> <p class="verinfo">(PHP 4 >= 4.2.0, PHP 5)</p><p class="refpurpose"><span class="refname">pg_send_query</span> — <span class="dc-title"> Sends asynchronous query </span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>pg_send_query</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$connection</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$query</tt></span> )</div> <p class="para rdfs-comment"> <b>pg_send_query()</b> sends a query or queries asynchronously to the <i><tt class="parameter">connection</tt></i>. Unlike <a href="function.pg-query.html" class="function">pg_query()</a>, it can send multiple queries at once to PostgreSQL and get the results one by one using <a href="function.pg-get-result.html" class="function">pg_get_result()</a>. </p> <p class="para"> Script execution is not blocked while the queries are executing. Use <a href="function.pg-connection-busy.html" class="function">pg_connection_busy()</a> to check if the connection is busy (i.e. the query is executing). Queries may be cancelled using <a href="function.pg-cancel-query.html" class="function">pg_cancel_query()</a>. </p> <p class="para"> Although the user can send multiple queries at once, multiple queries cannot be sent over a busy connection. If a query is sent while the connection is busy, it waits until the last query is finished and discards all its results. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">connection</tt></i></span> <dd> <p class="para"> PostgreSQL database connection resource. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">query</tt></i></span> <dd> <p class="para"> The SQL statement or statements to be executed. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para">Returns <b><tt>TRUE</tt></b> on success or <b><tt>FALSE</tt></b> on failure.</p> <p class="para"> Use <a href="function.pg-get-result.html" class="function">pg_get_result()</a> to determine the query result. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>pg_send_query()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /> $dbconn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=publisher"</span><span style="color: #007700">) or die(</span><span style="color: #DD0000">"Could not connect"</span><span style="color: #007700">);<br /><br /> if (!</span><span style="color: #0000BB">pg_connection_busy</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbconn</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">pg_send_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbconn</span><span style="color: #007700">, </span><span style="color: #DD0000">"select * from authors; select count(*) from authors;"</span><span style="color: #007700">);<br /> }<br /> <br /> </span><span style="color: #0000BB">$res1 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_get_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbconn</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"First call to pg_get_result(): $res1\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$rows1 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$res1</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"$res1 has $rows1 records\n\n"</span><span style="color: #007700">;<br /> <br /> </span><span style="color: #0000BB">$res2 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_get_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbconn</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"Second call to pg_get_result(): $res2\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$rows2 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$res2</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"$res2 has $rows2 records\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>First call to pg_get_result(): Resource id #3Resource id #3 has 3 recordsSecond call to pg_get_result(): Resource id #4Resource id #4 has 1 records</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.pg-query.html" class="function" rel="rdfs-seeAlso">pg_query()</a></li> <li class="member"><a href="function.pg-cancel-query.html" class="function" rel="rdfs-seeAlso">pg_cancel_query()</a></li> <li class="member"><a href="function.pg-get-result.html" class="function" rel="rdfs-seeAlso">pg_get_result()</a></li> <li class="member"><a href="function.pg-connection-busy.html" class="function" rel="rdfs-seeAlso">pg_connection_busy()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pg-send-query-params.html">pg_send_query_params</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pg-set-client-encoding.html">pg_set_client_encoding</a></div> <div class="up"><a href="ref.pgsql.html">PostgreSQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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