Postgres-XC 1.0.3 Documentation
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SPI_prepare_cursor

Name

SPI_prepare_cursor -- prepare a plan for a command, 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 OIDs 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, and CURSOR_OPT_FAST_PLAN. Note in particular that CURSOR_OPT_HOLD is ignored.

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