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><H1
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>PDO-&#62;query()</H1
><DIV
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><A
NAME="AEN176828"
></A
><P
>    (no version information, might be only in CVS)</P
>PDO-&#62;query()&nbsp;--&nbsp;
   Executes an SQL statement, returning a result set as a PDOStatement object
  </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN176831"
></A
><H2
>说明</H2
>class <B
CLASS="classname"
>PDO</B
> { <BR
></BR
>PDOStatement <B
CLASS="methodname"
>query</B
> ( string statement )<BR
></BR
>}class <B
CLASS="classname"
>PDO</B
> { <BR
></BR
>bool <B
CLASS="methodname"
>query</B
> ( string statement, int PDO::FETCH_COLUMN, int colno )<BR
></BR
>}class <B
CLASS="classname"
>PDO</B
> { <BR
></BR
>bool <B
CLASS="methodname"
>query</B
> ( string statement, int PDO::FETCH_CLASS, string classname, array ctorargs )<BR
></BR
>}class <B
CLASS="classname"
>PDO</B
> { <BR
></BR
>bool <B
CLASS="methodname"
>query</B
> ( string statement, int PDO::FETCH_INTO, object object )<BR
></BR
>}<P
>&#13;   <A
HREF="function.pdo-query.html"
>PDO-&#62;query()</A
> executes an SQL statement in
   a single function call, returning the result set (if any) returned by the
   statement as a PDOStatement object.
  </P
><P
>&#13;   For a query that you need to issue multiple times, you will realize better
   performance if you prepare a PDOStatement object using
   <A
HREF="function.pdo-prepare.html"
>PDO-&#62;prepare()</A
> and issue the statement with multiple
   calls to <A
HREF="function.pdostatement-execute.html"
>PDOStatement-&#62;execute()</A
>.
  </P
><P
>&#13;   If you do not fetch all of the data in a result set before issuing your
   next call to <A
HREF="function.pdo-query.html"
>PDO-&#62;query()</A
>, your call may fail. Call
   <A
HREF="function.pdostatement-closecursor.html"
>PDOStatement-&#62;closeCursor()</A
> to release the database
   resources associated with the PDOStatement object before issuing your
   next call to <A
HREF="function.pdo-query.html"
>PDO-&#62;query()</A
>.
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
    Although this function is only documented as having a single
    parameter, you may pass additional arguments to this function.
    They will be treated as though you called
    <A
HREF="function.pdostatement-setfetchmode.html"
>PDOStatement-&#62;setFetchMode()</A
> on the resultant statement
    object.
   </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN176902"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>statement</CODE
></DT
><DD
><P
>&#13;        The SQL statement to prepare and execute.
       </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN176911"
></A
><H2
>返回值</H2
><P
>&#13;    <A
HREF="function.pdo-query.html"
>PDO-&#62;query()</A
> returns a PDOStatement object.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN176915"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN176918"
></A
><P
><B
>例 1. Demonstrate PDO::query</B
></P
><P
>&#13;     A nice feature of <A
HREF="function.pdo-query.html"
>PDO-&#62;query()</A
> is that it
     enables you to iterate over the rowset returned by a
     successfully executed SELECT statement.
    </P
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">function </font><font color="#0000BB">getFruit</font><font color="#007700">(</font><font color="#0000BB">$conn</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$sql </font><font color="#007700">= </font><font color="#DD0000">'SELECT name, colour, calories FROM fruit ORDER BY name'</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;foreach (</font><font color="#0000BB">$conn</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#0000BB">$sql</font><font color="#007700">) as </font><font color="#0000BB">$row</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;print </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#DD0000">'NAME'</font><font color="#007700">] . </font><font color="#DD0000">"\t"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;print </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#DD0000">'COLOUR'</font><font color="#007700">] . </font><font color="#DD0000">"\t"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;print </font><font color="#0000BB">$row</font><font color="#007700">[</font><font color="#DD0000">'CALORIES'</font><font color="#007700">] . </font><font color="#DD0000">"\n"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
><TABLE
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CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>apple   red     150
banana  yellow  250
kiwi    brown   75
lemon   yellow  25
orange  orange  300
pear    green   150
watermelon      pink    90</PRE
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN176925"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
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><TR
><TD
><A
HREF="function.pdo-exec.html"
>PDO-&#62;exec()</A
></TD
></TR
><TR
><TD
><A
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>PDO-&#62;prepare()</A
></TD
></TR
><TR
><TD
><A
HREF="function.pdostatement-execute.html"
>PDOStatement-&#62;execute()</A
></TD
></TR
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></P
>
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