SPI_execute_plan_extended — execute a statement prepared by
plan, const SPIExecuteOptions *
SPI_execute_plan_extended executes a statement prepared by
SPI_prepare or one of its siblings. This function is equivalent to
SPI_execute_plan, except that information about the parameter values to be passed to the query is presented differently, and additional execution-controlling options can be passed.
Query parameter values are represented by a
ParamListInfo struct, which is convenient for passing down values that are already available in that format. Dynamic parameter sets can also be used, via hook functions specified in
Also, instead of always accumulating the result tuples into a
SPI_tuptable structure, tuples can be passed to a caller-supplied
DestReceiver object as they are generated by the executor. This is particularly helpful for queries that might generate many tuples, since the data can be processed on-the-fly instead of being accumulated in memory.
prepared statement (returned by
const SPIExecuteOptions *
struct containing optional arguments
Callers should always zero out the entire
options struct, then fill whichever fields they want to set. This ensures forward compatibility of code, since any fields that are added to the struct in future will be defined to behave backwards-compatibly if they are zero. The currently available
options fields are:
data structure containing query parameter types and values; NULL if none
true for read-only execution
true prevents SPI from managing snapshots for execution of the query; use with extreme caution
maximum number of rows to return, or
0 for no limit
DestReceiver object that will receive any tuples emitted by the query; if NULL, result tuples are accumulated into a
SPI_tuptable structure, as in
The resource owner that will hold a reference count on the plan while it is executed. If NULL, CurrentResourceOwner is used. Ignored for non-saved plans, as SPI does not acquire reference counts on those.
The return value is the same as for
options->dest is NULL,
SPI_tuptable are set as in
options->dest is not NULL,
SPI_processed is set to zero and
SPI_tuptable is set to NULL. If a tuple count is required, the caller's
DestReceiver object must calculate it.