Synopsis
Portal SPI_cursor_open(const char * name, void * plan,
Datum * values, const char * nulls,
bool read_only)Description
SPI_cursor_open sets up a cursor (internally,
a portal) that will execute a plan 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 plan 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.
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