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

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><H1
><A
NAME="function.PDO-pgsqlLOBOpen"
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>PDO::pgsqlLOBOpen</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN187526"
></A
><P
>    (no version information, might be only in CVS)</P
>PDO::pgsqlLOBOpen&nbsp;--&nbsp;Opens an existing large object stream</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN187529"
></A
><H2
>说明</H2
>resource <B
CLASS="methodname"
>PDO::pgsqlLOBOpen</B
> ( string oid [, string mode] )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>PDO::pgsqlLOBOpen()</B
> opens a stream to access the data
   referenced by <CODE
CLASS="parameter"
>oid</CODE
>.  If <CODE
CLASS="parameter"
>mode</CODE
>
   is <TT
CLASS="literal"
>r</TT
>, the stream is opened for reading, if
   <CODE
CLASS="parameter"
>mode</CODE
> is <TT
CLASS="literal"
>w</TT
>, then the stream will
   be opened for writing.  You can use all the usual filesystem functions,
   such as <A
HREF="function.fread.html"
><B
CLASS="function"
>fread()</B
></A
>, <A
HREF="function.fwrite.html"
><B
CLASS="function"
>fwrite()</B
></A
> and
   <A
HREF="function.fgets.html"
><B
CLASS="function"
>fgets()</B
></A
> to manipulate the contents of the stream.
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
    This function, and all manipulations of the large object,
    must be called and carried out within a transaction.
   </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN187552"
></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
><DT
><CODE
CLASS="parameter"
>mode</CODE
></DT
><DD
><P
>&#13;       If mode is <TT
CLASS="literal"
>r</TT
>, open the stream for reading.
       If mode is <TT
CLASS="literal"
>w</TT
>, open the stream for writing.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN187568"
></A
><H2
>返回值</H2
><P
>&#13;   Returns a stream resource on success, or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> on failure.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN187572"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN187575"
></A
><P
><B
>例 1. A <B
CLASS="function"
>PDO::pgsqlLOBOpen()</B
> example</B
></P
><P
>&#13;     Following on from the <B
CLASS="function"
>PDO::pgsqlLOBCreate()</B
>
     example, this code snippet retrieves the large object from
     the database and outputs it to the browser.
    </P
><TABLE
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><TD
><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">$db</font><font color="#007700">-&gt;</font><font color="#0000BB">beginTransaction</font><font color="#007700">();<br /></font><font color="#0000BB">$stmt </font><font color="#007700">= </font><font color="#0000BB">$db</font><font color="#007700">-&gt;</font><font color="#0000BB">prepare</font><font color="#007700">(</font><font color="#DD0000">"select oid from BLOBS where ident = ?"</font><font color="#007700">);<br /></font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">execute</font><font color="#007700">(array(</font><font color="#0000BB">$some_id</font><font color="#007700">));<br /></font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">bindColumn</font><font color="#007700">(</font><font color="#DD0000">'oid'</font><font color="#007700">, </font><font color="#0000BB">$lob</font><font color="#007700">, </font><font color="#0000BB">PDO</font><font color="#007700">::</font><font color="#0000BB">PARAM_LOB</font><font color="#007700">);<br /></font><font color="#0000BB">$stmt</font><font color="#007700">-&gt;</font><font color="#0000BB">fetch</font><font color="#007700">(</font><font color="#0000BB">PDO</font><font color="#007700">::</font><font color="#0000BB">FETCH_BOUND</font><font color="#007700">);<br /></font><font color="#0000BB">fpassthru</font><font color="#007700">(</font><font color="#0000BB">$lob</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN187581"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
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><TBODY
><TR
><TD
><B
CLASS="function"
>PDO::pgsqlLOBCreate()</B
></TD
></TR
><TR
><TD
><B
CLASS="function"
>PDO::pgsqlLOBUnlink()</B
></TD
></TR
><TR
><TD
><A
HREF="function.pg-lo-open.html"
><B
CLASS="function"
>pg_lo_open()</B
></A
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></P
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