Sophie: postgresql8.4-docs-8.4.12-0.1mdv2010.2 i586

postgresql8.4-docs-8.4.12-0.1mdv2010.2.i586.rpm

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><A
NAME="VIEW-PG-CURSORS"
>44.45. <TT
CLASS="STRUCTNAME"
>pg_cursors</TT
></A
></H1
><A
NAME="AEN78554"
></A
><P
>   The <TT
CLASS="STRUCTNAME"
>pg_cursors</TT
> view lists the cursors that
   are currently available. Cursors can be defined in several ways:
   <P
></P
></P><UL
><LI
><P
>      via the <A
HREF="sql-declare.html"
><I
>DECLARE</I
></A
>
      statement in SQL
     </P
></LI
><LI
><P
>      via the Bind message in the frontend/backend protocol, as
      described in <A
HREF="protocol-flow.html#PROTOCOL-FLOW-EXT-QUERY"
>Section 45.2.3</A
>
     </P
></LI
><LI
><P
>      via the Server Programming Interface (SPI), as described in
      <A
HREF="spi-interface.html"
>Section 42.1</A
>
     </P
></LI
></UL
><P>

   The <TT
CLASS="STRUCTNAME"
>pg_cursors</TT
> view displays cursors
   created by any of these means. Cursors only exist for the duration
   of the transaction that defines them, unless they have been
   declared <TT
CLASS="LITERAL"
>WITH HOLD</TT
>. Therefore non-holdable
   cursors are only present in the view until the end of their
   creating transaction.

   </P><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>     Cursors are used internally to implement some of the components
     of <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>, such as procedural languages.
     Therefore, the <TT
CLASS="STRUCTNAME"
>pg_cursors</TT
> view might include cursors
     that have not been explicitly created by the user.
    </P
></BLOCKQUOTE
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  </P
><DIV
CLASS="TABLE"
><A
NAME="AEN78574"
></A
><P
><B
>Table 44-46. <TT
CLASS="STRUCTNAME"
>pg_cursors</TT
> Columns</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Type</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>name</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
>The name of the cursor</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>statement</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
>The verbatim query string submitted to declare this cursor</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>is_holdable</TT
></TD
><TD
><TT
CLASS="TYPE"
>boolean</TT
></TD
><TD
>       <TT
CLASS="LITERAL"
>true</TT
> if the cursor is holdable (that is, it
       can be accessed after the transaction that declared the cursor
       has committed); <TT
CLASS="LITERAL"
>false</TT
> otherwise
       </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>is_binary</TT
></TD
><TD
><TT
CLASS="TYPE"
>boolean</TT
></TD
><TD
>       <TT
CLASS="LITERAL"
>true</TT
> if the cursor was declared
       <TT
CLASS="LITERAL"
>BINARY</TT
>; <TT
CLASS="LITERAL"
>false</TT
>
       otherwise
       </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>is_scrollable</TT
></TD
><TD
><TT
CLASS="TYPE"
>boolean</TT
></TD
><TD
>       <TT
CLASS="LITERAL"
>true</TT
> if the cursor is scrollable (that is, it
       allows rows to be retrieved in a nonsequential manner);
       <TT
CLASS="LITERAL"
>false</TT
> otherwise
       </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>creation_time</TT
></TD
><TD
><TT
CLASS="TYPE"
>timestamptz</TT
></TD
><TD
>The time at which the cursor was declared</TD
></TR
></TBODY
></TABLE
></DIV
><P
>   The <TT
CLASS="STRUCTNAME"
>pg_cursors</TT
> view is read only.
  </P
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