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

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>PDOStatement-&#62;closeCursor()</H1
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NAME="AEN177350"
></A
><P
>    (no version information, might be only in CVS)</P
>PDOStatement-&#62;closeCursor()&nbsp;--&nbsp;
   Closes the cursor, enabling the statement to be executed again.
  </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177353"
></A
><H2
>说明</H2
>class <B
CLASS="classname"
>PDOStatement</B
> { <BR
></BR
>bool <B
CLASS="methodname"
>closeCursor</B
> ( void  )<BR
></BR
>}<P
>&#13;   <A
HREF="function.pdostatement-closecursor.html"
>PDOStatement-&#62;closeCursor()</A
> frees up the connection
   to the server so that other SQL statements may be issued, but leaves the
   statement in a state that enables it to be executed again.
  </P
><P
>&#13;   This method is useful for database drivers that do not support executing
   a PDOStatement object when a previously executed PDOStatement object still
   has unfetched rows. If your database driver suffers from this limitation,
   the problem may manifest itself in an out-of-sequence error.
  </P
><P
>&#13;   <A
HREF="function.pdostatement-closecursor.html"
>PDOStatement-&#62;closeCursor()</A
> is implemented either as an
   optional driver specific method (allowing for maximum efficiency), or as
   the generic PDO fallback if no driver specific function is installed.
   The PDO generic fallback is semantically the same as writing the following
   code in your PHP script:
   <TABLE
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BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">do {<br />&nbsp;&nbsp;&nbsp;&nbsp;while (</font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">fetch</font><font color="#007700">())<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;<br />&nbsp;&nbsp;&nbsp;&nbsp;if (!</font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">nextRowset</font><font color="#007700">())<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br />} while (</font><font color="#0000BB">true</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177368"
></A
><H2
>返回值</H2
><P
>&#13;   如果成功则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，失败则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177373"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><TR
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><DIV
CLASS="example"
><A
NAME="AEN177376"
></A
><P
><B
>例 1. A <A
HREF="function.pdostatement-closecursor.html"
>PDOStatement-&#62;closeCursor()</A
> example</B
></P
><P
>&#13;     In the following example, the <CODE
CLASS="varname"
>$stmt</CODE
> PDOStatement
     object returns multiple rows but the application fetches only the first
     row, leaving the PDOStatement object in a state of having unfetched rows.
     To ensure that the application will work with all database drivers, the
     author inserts a call to <A
HREF="function.pdostatement-closecursor.html"
>PDOStatement-&#62;closeCursor()</A
>
     on <CODE
CLASS="varname"
>$stmt</CODE
> before executing the
     <CODE
CLASS="varname"
>$otherStmt</CODE
> PDOStatement object.
    </P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">/* Create a PDOStatement object */<br /></font><font color="#0000BB">$stmt </font><font color="#007700">= </font><font color="#0000BB">$dbh</font><font color="#007700">-&gt;</font><font color="#0000BB">prepare</font><font color="#007700">(</font><font color="#DD0000">'SELECT foo FROM bar'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Create a second PDOStatement object */<br /></font><font color="#0000BB">$otherStmt </font><font color="#007700">= </font><font color="#0000BB">$dbh</font><font color="#007700">-&gt;</font><font color="#0000BB">prepare</font><font color="#007700">(</font><font color="#DD0000">'SELECT foobaz FROM foobar'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Execute the first statement */<br /></font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">execute</font><font color="#007700">();<br /><br /></font><font color="#FF8000">/* Fetch only the first row from the results */<br /></font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">fetch</font><font color="#007700">();<br /><br /></font><font color="#FF8000">/* The following call to closeCursor() may be required by some drivers */<br /></font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">closeCursor</font><font color="#007700">();<br /><br /></font><font color="#FF8000">/* Now we can execute the second statement */<br /></font><font color="#0000BB">$otherStmt</font><font color="#007700">-&gt;</font><font color="#0000BB">execute</font><font color="#007700">();<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN177385"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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