~ubuntu-branches/ubuntu/trusty/postgresql-9.3/trusty-updates : contents of doc/src/sgml/html/spi-spi-cursor-open-with-args.html at revision 27

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><H1
><A
NAME="SPI-SPI-CURSOR-OPEN-WITH-ARGS"
></A
>SPI_cursor_open_with_args</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN62845"
></A
><H2
>Name</H2
>SPI_cursor_open_with_args&nbsp;--&nbsp;set up a cursor using a query and parameters</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN62850"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>Portal SPI_cursor_open_with_args(const char *<TT
CLASS="PARAMETER"
>name</TT
>,
                                 const char *<TT
CLASS="PARAMETER"
>command</TT
>,
                                 int <TT
CLASS="PARAMETER"
>nargs</TT
>, Oid *<TT
CLASS="PARAMETER"
>argtypes</TT
>,
                                 Datum *<TT
CLASS="PARAMETER"
>values</TT
>, const char *<TT
CLASS="PARAMETER"
>nulls</TT
>,
                                 bool <TT
CLASS="PARAMETER"
>read_only</TT
>, int <TT
CLASS="PARAMETER"
>cursorOptions</TT
>)</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN62860"
></A
><H2
>Description</H2
><P
>   <CODE
CLASS="FUNCTION"
>SPI_cursor_open_with_args</CODE
> sets up a cursor
   (internally, a portal) that will execute the specified query.
   Most of the parameters have the same meanings as the corresponding
   parameters to <CODE
CLASS="FUNCTION"
>SPI_prepare_cursor</CODE
>
   and <CODE
CLASS="FUNCTION"
>SPI_cursor_open</CODE
>.
  </P
><P
>   For one-time query execution, this function should be preferred
   over <CODE
CLASS="FUNCTION"
>SPI_prepare_cursor</CODE
> followed by
   <CODE
CLASS="FUNCTION"
>SPI_cursor_open</CODE
>.
   If the same command is to be executed with many different parameters,
   either method might be faster, depending on the cost of re-planning
   versus the benefit of custom plans.
  </P
><P
>   The passed-in parameter data will be copied into the cursor's portal, so it
   can be freed while the cursor still exists.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN62870"
></A
><H2
>Arguments</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>const char * <TT
CLASS="PARAMETER"
>name</TT
></TT
></DT
><DD
><P
>      name for portal, or <TT
CLASS="SYMBOL"
>NULL</TT
> to let the system
      select a name
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>const char * <TT
CLASS="PARAMETER"
>command</TT
></TT
></DT
><DD
><P
>      command string
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>int <TT
CLASS="PARAMETER"
>nargs</TT
></TT
></DT
><DD
><P
>      number of input parameters (<TT
CLASS="LITERAL"
>$1</TT
>, <TT
CLASS="LITERAL"
>$2</TT
>, etc.)
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>Oid * <TT
CLASS="PARAMETER"
>argtypes</TT
></TT
></DT
><DD
><P
>      an array of length <TT
CLASS="PARAMETER"
>nargs</TT
>, containing the
      <ACRONYM
CLASS="ACRONYM"
>OID</ACRONYM
>s of the data types of the parameters
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>Datum * <TT
CLASS="PARAMETER"
>values</TT
></TT
></DT
><DD
><P
>      an array of length <TT
CLASS="PARAMETER"
>nargs</TT
>, containing the actual
      parameter values
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>const char * <TT
CLASS="PARAMETER"
>nulls</TT
></TT
></DT
><DD
><P
>      an array of length <TT
CLASS="PARAMETER"
>nargs</TT
>, describing which
      parameters are null
     </P
><P
>      If <TT
CLASS="PARAMETER"
>nulls</TT
> is <TT
CLASS="SYMBOL"
>NULL</TT
> then
      <CODE
CLASS="FUNCTION"
>SPI_cursor_open_with_args</CODE
> assumes that no parameters
      are null.  Otherwise, each entry of the <TT
CLASS="PARAMETER"
>nulls</TT
>
      array should be <TT
CLASS="LITERAL"
>'&nbsp;'</TT
> if the corresponding parameter
      value is non-null, or <TT
CLASS="LITERAL"
>'n'</TT
> if the corresponding parameter
      value is null.  (In the latter case, the actual value in the
      corresponding <TT
CLASS="PARAMETER"
>values</TT
> entry doesn't matter.)  Note
      that <TT
CLASS="PARAMETER"
>nulls</TT
> is not a text string, just an array:
      it does not need a <TT
CLASS="LITERAL"
>'\0'</TT
> terminator.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>bool <TT
CLASS="PARAMETER"
>read_only</TT
></TT
></DT
><DD
><P
><TT
CLASS="LITERAL"
>true</TT
> for read-only execution</P
></DD
><DT
><TT
CLASS="LITERAL"
>int <TT
CLASS="PARAMETER"
>cursorOptions</TT
></TT
></DT
><DD
><P
>      integer bit mask of cursor options; zero produces default behavior
     </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN62939"
></A
><H2
>Return Value</H2
><P
>   Pointer to portal containing the cursor.  Note there is no error
   return convention; any error will be reported via <CODE
CLASS="FUNCTION"
>elog</CODE
>.
  </P
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