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

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>PDO::pgsqlLOBUnlink</H1
><DIV
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><A
NAME="AEN187592"
></A
><P
>    (no version information, might be only in CVS)</P
>PDO::pgsqlLOBUnlink&nbsp;--&nbsp;Deletes the large object</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN187595"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>PDO::pgsqlLOBUnlink</B
> ( string oid )<BR
></BR
><P
>&#13;   Deletes a large object from the database identified by OID.
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
    This function must be called within a transaction.
   </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN187606"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>oid</CODE
></DT
><DD
><P
>&#13;       A large object identifier
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN187615"
></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="AEN187620"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><A
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></A
><P
><B
>例 1. A <B
CLASS="function"
>PDO::pgsqlLOBUnlink()</B
> example</B
></P
><P
>&#13;     This example unlinks a large object from the database prior to deleting
     the row that references it from the blobs table we've been using in
     our <B
CLASS="function"
>PDO::pgsqlLOBCreate()</B
> and
     <B
CLASS="function"
>PDO::pgsqlLOBOpen()</B
> examples.
    </P
><TABLE
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$db </font><font color="#007700">= new </font><font color="#0000BB">PDO</font><font color="#007700">(</font><font color="#DD0000">'pgsql:dbname=test host=localhost'</font><font color="#007700">, </font><font color="#0000BB">$user</font><font color="#007700">, </font><font color="#0000BB">$pass</font><font color="#007700">);<br /></font><font color="#0000BB">$db</font><font color="#007700">-&gt;</font><font color="#0000BB">setAttribute</font><font color="#007700">(</font><font color="#0000BB">PDO</font><font color="#007700">::</font><font color="#0000BB">ATTR_ERRMODE</font><font color="#007700">, </font><font color="#0000BB">PDO</font><font color="#007700">::</font><font color="#0000BB">ERRMODE_EXCEPTION</font><font color="#007700">);<br /></font><font color="#0000BB">$db</font><font color="#007700">-&gt;</font><font color="#0000BB">beginTransaction</font><font color="#007700">();<br /></font><font color="#0000BB">$db</font><font color="#007700">-&gt;</font><font color="#0000BB">pgsqlLOBUnlink</font><font color="#007700">(</font><font color="#0000BB">$oid</font><font color="#007700">);<br /></font><font color="#0000BB">$stmt </font><font color="#007700">= </font><font color="#0000BB">$db</font><font color="#007700">-&gt;</font><font color="#0000BB">prepare</font><font color="#007700">(</font><font color="#DD0000">"DELETE FROM BLOBS where ident = ?"</font><font color="#007700">);<br /></font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">execute</font><font color="#007700">(array(</font><font color="#0000BB">$some_id</font><font color="#007700">));<br /></font><font color="#0000BB">$db</font><font color="#007700">-&gt;</font><font color="#0000BB">commit</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="AEN187630"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
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><TBODY
><TR
><TD
><B
CLASS="function"
>PDO::pgsqlLOBOpen()</B
></TD
></TR
><TR
><TD
><B
CLASS="function"
>PDO::pgsqlLOBCreate()</B
></TD
></TR
></TBODY
></TABLE
><P
></P
>
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