SPI_prepare_cursor

SPI_prepare_cursor
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SPI_prepare_cursor

SPI_prepare_cursor - prepare a statement, without executing it yet

Synopsis

SPIPlanPtr SPI_prepare_cursor(const char * command, int nargs,
                              Oid * argtypes, int cursorOptions)

Description

SPI_prepare_cursor is identical to SPI_prepare , except that it also allows specification of the planner's " cursor options " parameter. This is a bit mask having the values shown in nodes/parsenodes.h for the options field of DeclareCursorStmt . SPI_prepare always takes the cursor options as zero.

Arguments

const char * command: command string
int nargs: number of input parameters ( $1 , $2 , etc.)
Oid * argtypes: pointer to an array containing the OID s of the data types of the parameters
int cursorOptions: integer bit mask of cursor options; zero produces default behavior

Return Value

SPI_prepare_cursor has the same return conventions as SPI_prepare .

Notes

Useful bits to set in cursorOptions include CURSOR_OPT_SCROLL , CURSOR_OPT_NO_SCROLL , CURSOR_OPT_FAST_PLAN , CURSOR_OPT_GENERIC_PLAN , and CURSOR_OPT_CUSTOM_PLAN . Note in particular that CURSOR_OPT_HOLD is ignored.

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