SPI_KEEPPLAN(3) PostgreSQL 9.2.7 Documentation SPI_KEEPPLAN(3)NAME
SPI_keepplan - save a prepared statement
SYNOPSIS
int SPI_keepplan(SPIPlanPtr plan)
DESCRIPTION
SPI_keepplan saves a passed statement (prepared by SPI_prepare) so that it will not be freed by SPI_finish nor by the transaction manager.
This gives you the ability to reuse prepared statements in the subsequent invocations of your procedure in the current session.
ARGUMENTS
SPIPlanPtr plan
the prepared statement to be saved
RETURN VALUE
0 on success; SPI_ERROR_ARGUMENT if plan is NULL or invalid
NOTES
The passed-in statement is relocated to permanent storage by means of pointer adjustment (no data copying is required). If you later wish
to delete it, use SPI_freeplan on it.
PostgreSQL 9.2.7 2014-02-17 SPI_KEEPPLAN(3)
Check Out this Related Man Page
SPI_CURSOR_OPEN(3) PostgreSQL 9.2.7 Documentation SPI_CURSOR_OPEN(3)NAME
SPI_cursor_open - set up a cursor using a statement created with SPI_prepare
SYNOPSIS
Portal SPI_cursor_open(const char * name, SPIPlanPtr plan,
Datum * values, const char * nulls,
bool read_only)
DESCRIPTION
SPI_cursor_open sets up a cursor (internally, a portal) that will execute a statement prepared by SPI_prepare. The parameters have the same
meanings as the corresponding parameters to SPI_execute_plan.
Using a cursor instead of executing the statement directly has two benefits. First, the result rows can be retrieved a few at a time,
avoiding memory overrun for queries that return many rows. Second, a portal can outlive the current procedure (it can, in fact, live to the
end of the current transaction). Returning the portal name to the procedure's caller provides a way of returning a row set as result.
The passed-in parameter data will be copied into the cursor's portal, so it can be freed while the cursor still exists.
ARGUMENTS
const char * name
name for portal, or NULL to let the system select a name
SPIPlanPtr plan
prepared statement (returned by SPI_prepare)
Datum * values
An array of actual parameter values. Must have same length as the statement's number of arguments.
const char * nulls
An array describing which parameters are null. Must have same length as the statement's number of arguments. n indicates a null value
(entry in values will be ignored); a space indicates a nonnull value (entry in values is valid).
If nulls is NULL then SPI_cursor_open assumes that no parameters are null.
bool read_only
true for read-only execution
RETURN VALUE
Pointer to portal containing the cursor. Note there is no error return convention; any error will be reported via elog.
PostgreSQL 9.2.7 2014-02-17 SPI_CURSOR_OPEN(3)
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