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php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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><H1
><A
NAME="function.PDOStatement-getColumnMeta"
></A
>PDOStatement-&#62;getColumnMeta()</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN177927"
></A
><P
>    (no version information, might be only in CVS)</P
>PDOStatement-&#62;getColumnMeta()&nbsp;--&nbsp;
   Returns metadata for a column in a result set
  </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177930"
></A
><H2
>说明</H2
>class <B
CLASS="classname"
>PDOStatement</B
> { <BR
></BR
>mixed <B
CLASS="methodname"
>getColumnMeta</B
> ( int column )<BR
></BR
>}<DIV
CLASS="warning"
><P
></P
><TABLE
CLASS="warning"
BORDER="1"
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><TR
><TD
ALIGN="CENTER"
><B
>警告</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>本函数是<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>实验性</I
></SPAN
>的。本函数的行为，包括函数名称以及其它任何关于本函数的文档可能会在没有通知的情况下随
PHP 以后的发布而改变。使用本函数风险自担。</P
></TD
></TR
></TABLE
></DIV
><P
>&#13;   Retrieves the metadata for a 0-indexed column in a result set as an
   associative array.
  </P
><DIV
CLASS="warning"
><P
></P
><TABLE
CLASS="warning"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>警告</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>&#13;    Not all PDO drivers support
    <A
HREF="function.pdostatement-getcolumnmeta.html"
>PDOStatement-&#62;getColumnMeta()</A
>.
   </P
></TD
></TR
></TABLE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177948"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>column</CODE
></DT
><DD
><P
>&#13;        The 0-indexed column in the result set.
       </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177957"
></A
><H2
>返回值</H2
><P
>&#13;   Returns an associative array containing the following values representing
   the metadata for a single column:
  </P
><DIV
CLASS="table"
><A
NAME="AEN177960"
></A
><P
><B
>表 1. Column metadata</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL
WIDTH="1*"
TITLE="c1"><COL
WIDTH="1*"
TITLE="c2"><THEAD
><TR
><TH
>Name</TH
><TH
>Value</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="literal"
>native_type</TT
></TD
><TD
>The PHP native type used to represent the column value.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
><CODE
CLASS="varname"
>driver</CODE
>:decl_type</TT
></TD
><TD
>The SQL type used to represent the column value in the database.
       If the column in the result set is the result of a function, this value
       is not returned by <A
HREF="function.pdostatement-getcolumnmeta.html"
>PDOStatement-&#62;getColumnMeta()</A
>.
       </TD
></TR
><TR
><TD
><TT
CLASS="literal"
>flags</TT
></TD
><TD
>Any flags set for this column.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>name</TT
></TD
><TD
>The name of this column as returned by the database.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>len</TT
></TD
><TD
>The length of this column. Normally <TT
CLASS="literal"
>-1</TT
> for
       types other than floating point decimals.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>precision</TT
></TD
><TD
>The numeric precision of this column. Normally
       <TT
CLASS="literal"
>0</TT
> for types other than floating point
       decimals.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>pdo_type</TT
></TD
><TD
>The type of this column as represented by the
       <TT
CLASS="literal"
>PDO::PARAM_*</TT
> constants.</TD
></TR
></TBODY
></TABLE
></DIV
><P
>&#13;   Returns <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if the requested column does not exist in the result set,
   or if no result set exists.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN178005"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN178008"
></A
><P
><B
>例 1. Retrieving column metadata</B
></P
><P
>&#13;     The following example shows the results of retrieving the metadata for a
     single column generated by a function (COUNT) in a PDO_SQLITE driver.
    </P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$select </font><font color="#007700">= </font><font color="#0000BB">$DB</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#DD0000">'SELECT COUNT(*) FROM fruit'</font><font color="#007700">);<br /></font><font color="#0000BB">$meta </font><font color="#007700">= </font><font color="#0000BB">$select</font><font color="#007700">-&gt;</font><font color="#0000BB">getColumnMeta</font><font color="#007700">(</font><font color="#0000BB">0</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$meta</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
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><PRE
CLASS="screen"
>array(6) {
  ["native_type"]=&#62;
  string(7) "integer"
  ["flags"]=&#62;
  array(0) {
  }
  ["name"]=&#62;
  string(8) "COUNT(*)"
  ["len"]=&#62;
  int(-1)
  ["precision"]=&#62;
  int(0)
  ["pdo_type"]=&#62;
  int(2)
}</PRE
></TD
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></TABLE
></DIV
></TD
></TR
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN178014"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.pdostatement-columncount.html"
>PDOStatement-&#62;columnCount()</A
></TD
></TR
><TR
><TD
><A
HREF="function.pdostatement-rowcount.html"
>PDOStatement-&#62;rowCount()</A
></TD
></TR
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></TABLE
><P
></P
>
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