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>pg_send_query</H1
><DIV
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NAME="AEN187065"
></A
><P
>    (PHP 4 &#62;= 4.2.0, PHP 5)</P
>pg_send_query&nbsp;--&nbsp;
     发送异步查询
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN187068"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>pg_send_query</B
> ( resource connection, string query )<BR
></BR
>bool <B
CLASS="methodname"
>pg_send_query</B
> ( string query )<BR
></BR
><P
>&#13;     <B
CLASS="function"
>pg_send_query()</B
> 向 <CODE
CLASS="parameter"
>connection</CODE
>
     连接发送异步查询。和 <A
HREF="function.pg-query.html"
><B
CLASS="function"
>pg_query()</B
></A
> 不同，它可以向 PostgreSQL
     发送多个查询并用 <A
HREF="function.pg-get-result.html"
><B
CLASS="function"
>pg_get_result()</B
></A
>
     依次得到结果。当执行查询时脚本的执行不会被锁定。用
     <A
HREF="function.pg-connection-busy.html"
><B
CLASS="function"
>pg_connection_busy()</B
></A
> 来检查连接连接是否为忙（即查询正在执行中）。调用
     <A
HREF="function.pg-cancel-query.html"
><B
CLASS="function"
>pg_cancel_query()</B
></A
> 则有可能取消查询。
    </P
><P
>&#13;     尽管用户可以一次发送多个查询，但用户不能通过正忙的连接发送多个查询。如果向正忙的连接发送了查询，则会等待上一条查询结束并丢弃所有结果。
    </P
><P
>&#13;     <TABLE
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><TR
><TD
><DIV
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><A
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></A
><P
><B
>例 1. 异步查询</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />&nbsp;&nbsp;&nbsp;&nbsp;$dbconn </font><font color="#007700">= </font><font color="#0000BB">pg_connect</font><font color="#007700">(</font><font color="#DD0000">"dbname=publisher"</font><font color="#007700">) or die(</font><font color="#DD0000">"Could not connect"</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;if (!</font><font color="#0000BB">pg_connection_busy</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">pg_send_query</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">,</font><font color="#DD0000">"select * from authors; select count(*) from authors;"</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$res1 </font><font color="#007700">= </font><font color="#0000BB">pg_get_result</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"First call to pg_get_result(): $res1</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$rows1 </font><font color="#007700">= </font><font color="#0000BB">pg_num_rows</font><font color="#007700">(</font><font color="#0000BB">$res1</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"$res1 has $rows1 records</font><font color="#007700">\n\n</font><font color="#DD0000">"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$res2 </font><font color="#007700">= </font><font color="#0000BB">pg_get_result</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"second call to pg_get_result(): $res2</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$rows2 </font><font color="#007700">= </font><font color="#0000BB">pg_num_rows</font><font color="#007700">(</font><font color="#0000BB">$res2</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"$res2 has $rows2 records</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><P
>&#13;       上例输出如下：
      </P
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><PRE
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>first call to pg_get_result(): Resource id #3
Resource id #3 has 3 records

second call to pg_get_result(): Resource id #4
Resource id #4 has 1 records</PRE
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>
    </P
><P
>&#13;     参见 <A
HREF="function.pg-query.html"
><B
CLASS="function"
>pg_query()</B
></A
>，<A
HREF="function.pg-cancel-query.html"
><B
CLASS="function"
>pg_cancel_query()</B
></A
>，<A
HREF="function.pg-get-result.html"
><B
CLASS="function"
>pg_get_result()</B
></A
>
     和 <A
HREF="function.pg-connection-busy.html"
><B
CLASS="function"
>pg_connection_busy()</B
></A
>。
    </P
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