PostgreSQL
SPI_is_cursor_plan
SPI_is_cursor_plan — return true if a statement prepared by SPI_prepare can be used with SPI_cursor_open
Description
SPI_is_cursor_plan returns true if a statement prepared by SPI_prepare can be passed as an argument to SPI_cursor_open, or false if that is not the case. The criteria are that the `plan represents one single command and that this command returns tuples to the caller; for example, `SELECT is allowed unless it contains an INTO clause, and UPDATE is allowed only if it contains a RETURNING clause.
Return Value
true or false to indicate if the `plan can produce a cursor or not, with `SPI_result set to zero. If it is not possible to determine the answer (for example, if the `plan is `NULL or invalid, or if called when not connected to SPI), then SPI_result is set to a suitable error code and false is returned.
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