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>PDOStatement-&#62;columnCount()</TITLE
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><H1
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>PDOStatement-&#62;columnCount()</H1
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NAME="AEN177392"
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><P
>    (no version information, might be only in CVS)</P
>PDOStatement-&#62;columnCount()&nbsp;--&nbsp;
   Returns the number of columns in the result set
  </DIV
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CLASS="refsect1"
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NAME="AEN177395"
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><H2
>说明</H2
>class <B
CLASS="classname"
>PDOStatement</B
> { <BR
></BR
>int <B
CLASS="methodname"
>columnCount</B
> ( void  )<BR
></BR
>}<P
>&#13;   Use <A
HREF="function.pdostatement-columncount.html"
>PDOStatement-&#62;columnCount()</A
> to return the number
   of columns in the result set represented by the PDOStatement object.
  </P
><P
>&#13;   If the PDOStatement object was returned from <A
HREF="function.pdo-query.html"
>PDO-&#62;query()</A
>,
   the column count is immediately available.
  </P
><P
>&#13;   If the PDOStatement object was returned from
   <A
HREF="function.pdo-prepare.html"
>PDO-&#62;prepare()</A
>, an accurate column count will not be
   available until you invoke <A
HREF="function.pdostatement-execute.html"
>PDOStatement-&#62;execute()</A
>.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177411"
></A
><H2
>返回值</H2
><P
>&#13;   Returns the number of columns in the result set represented by the
   PDOStatement object. If there is no result set,
   <A
HREF="function.pdostatement-columncount.html"
>PDOStatement-&#62;columnCount()</A
> returns <TT
CLASS="literal"
>0</TT
>.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177416"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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></A
><P
><B
>例 1. Counting columns</B
></P
><P
>&#13;     This example demonstrates how <A
HREF="function.pdostatement-columncount.html"
>PDOStatement-&#62;columnCount()</A
>
     operates with and without a result set.
    </P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$dbh </font><font color="#007700">= new </font><font color="#0000BB">PDO</font><font color="#007700">(</font><font color="#DD0000">'odbc:sample'</font><font color="#007700">, </font><font color="#DD0000">'db2inst1'</font><font color="#007700">, </font><font color="#DD0000">'ibmdb2'</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$sth </font><font color="#007700">= </font><font color="#0000BB">$dbh</font><font color="#007700">-&gt;</font><font color="#0000BB">prepare</font><font color="#007700">(</font><font color="#DD0000">"SELECT name, colour FROM fruit"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Count the number of columns in the (non-existent) result set */<br /></font><font color="#0000BB">$colcount </font><font color="#007700">= </font><font color="#0000BB">$sth</font><font color="#007700">-&gt;</font><font color="#0000BB">columnCount</font><font color="#007700">();<br />print(</font><font color="#DD0000">"Before execute(), result set has $colcount columns (should be 0)</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$sth</font><font color="#007700">-&gt;</font><font color="#0000BB">execute</font><font color="#007700">();<br /><br /></font><font color="#FF8000">/* Count the number of columns in the result set */<br /></font><font color="#0000BB">$colcount </font><font color="#007700">= </font><font color="#0000BB">$sth</font><font color="#007700">-&gt;</font><font color="#0000BB">columnCount</font><font color="#007700">();<br />print(</font><font color="#DD0000">"After execute(), result set has $colcount columns (should be 2)</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><P
>上例将输出：</P
><TABLE
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><TD
><PRE
CLASS="screen"
>Before execute(), result set has 0 columns (should be 0)
After execute(), result set has 2 columns (should be 2)</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177426"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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><TD
><A
HREF="function.pdo-prepare.html"
>PDO-&#62;prepare()</A
></TD
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><TD
><A
HREF="function.pdostatement-execute.html"
>PDOStatement-&#62;execute()</A
></TD
></TR
><TR
><TD
><A
HREF="function.pdostatement-rowcount.html"
>PDOStatement-&#62;rowCount()</A
></TD
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>
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