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>PDOStatement-&#62;fetchColumn()</H1
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NAME="AEN177790"
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><P
>    (no version information, might be only in CVS)</P
>PDOStatement-&#62;fetchColumn()&nbsp;--&nbsp;
   Returns a single column from the next row of a result set
  </DIV
><DIV
CLASS="refsect1"
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NAME="AEN177793"
></A
><H2
>说明</H2
>class <B
CLASS="classname"
>PDOStatement</B
> { <BR
></BR
>string <B
CLASS="methodname"
>fetchColumn</B
> ( [int column_number] )<BR
></BR
>}<P
>&#13;   Returns a single column from the next row of a result set or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if
   there are no more rows.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177806"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>column_number</CODE
></DT
><DD
><P
>&#13;       0-indexed number of the column you wish to retrieve from the row. If
       no value is supplied, <A
HREF="function.pdostatement-fetchcolumn.html"
>PDOStatement-&#62;fetchColumn()</A
>
       fetches the first column.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177816"
></A
><H2
>返回值</H2
><P
>&#13;   <A
HREF="function.pdostatement-fetchcolumn.html"
>PDOStatement-&#62;fetchColumn()</A
> returns a single column
   in the next row of a result set.
  </P
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>警告</B
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>&#13;    There is no way to return another column from the same row if you
    use <A
HREF="function.pdostatement-fetchcolumn.html"
>PDOStatement-&#62;fetchColumn()</A
> to retrieve data.
   </P
></TD
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><DIV
CLASS="refsect1"
><A
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></A
><H2
>范例</H2
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><P
><B
>例 1. Return first column of the next row</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$sth </font><font color="#007700">= </font><font color="#0000BB">$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 /></font><font color="#0000BB">$sth</font><font color="#007700">-&gt;</font><font color="#0000BB">execute</font><font color="#007700">();<br /><br /></font><font color="#FF8000">/* Fetch the first column from the next row in the result set */<br /></font><font color="#007700">print(</font><font color="#DD0000">"Fetch the first column from the next row in the result set:\n"</font><font color="#007700">);<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$sth</font><font color="#007700">-&gt;</font><font color="#0000BB">fetchColumn</font><font color="#007700">();<br />print(</font><font color="#DD0000">"name = $result</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">);<br /><br />print(</font><font color="#DD0000">"Fetch the second column from the next row in the result set:\n"</font><font color="#007700">);<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$sth</font><font color="#007700">-&gt;</font><font color="#0000BB">fetchColumn</font><font color="#007700">(</font><font color="#0000BB">1</font><font color="#007700">);<br />print(</font><font color="#DD0000">"colour = $result</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
>上例将输出：</P
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>Fetch the first column from the next row in the result set:
name = lemon
Fetch the second column from the next row in the result set:
colour = red</PRE
></TD
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></TD
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>
  </P
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><DIV
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><A
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></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
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><TR
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><A
HREF="function.pdo-query.html"
>PDO-&#62;query()</A
></TD
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><TR
><TD
><A
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>PDOStatement-&#62;fetch()</A
></TD
></TR
><TR
><TD
><A
HREF="function.pdostatement-fetchall.html"
>PDOStatement-&#62;fetchAll()</A
></TD
></TR
><TR
><TD
><A
HREF="function.pdo-prepare.html"
>PDO-&#62;prepare()</A
></TD
></TR
><TR
><TD
><A
HREF="function.pdostatement-setfetchmode.html"
>PDOStatement-&#62;setFetchMode()</A
></TD
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