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int SPI_execute_with_args(const char *command,
int nargs, Oid *argtypes,
Datum *values, const char *nulls,
bool read_only, long count)
SPI_execute_with_args executes a command that might
include references to externally supplied parameters. The command text
refers to a parameter as $n, and
the call specifies data types and values for each such symbol.
read_only and count have
the same interpretation as in SPI_execute.
The main advantage of this routine compared to
SPI_execute is that data values can be inserted
into the command without tedious quoting/escaping, and thus with much
less risk of SQL-injection attacks.
Similar results can be achieved with SPI_prepare followed by
SPI_execute_plan; however, when using this function
the query plan is customized to the specific parameter values provided.
For one-time query execution, this function should be preferred.
If the same command is to be executed with many different parameters,
either method might be faster, depending on the cost of re-planning
versus the benefit of custom plans.
command string
number of input parameters ($1, $2, etc.)
an array containing the OIDs of the data types of the parameters
an array of actual parameter values
an array describing which parameters are null
If nulls is NULL then
SPI_execute_with_args assumes that no parameters are
null.
true for read-only execution
maximum number of rows to process or return
The return value is the same as for SPI_execute.
SPI_processed and
SPI_tuptable are set as in
SPI_execute if successful.