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The PostgreSQL 9.0 Reference Manual - Volume 2 - Programming Guide
by The PostgreSQL Global Development Group
Paperback (6"x9"), 478 pages
ISBN 9781906966065
RRP £14.95 ($19.95)

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13.1.7 SPI_execute_with_args

Name

SPI_execute_with_args -- execute a command with out-of-line parameters

Synopsis

int SPI_execute_with_args(const char *command, int nargs, Oid
 *argtypes, Datum *values, const char *nulls, bool read_only,
 long count)

Description

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.

Arguments

const char * command
command string
int nargs
number of input parameters ($1, $2, etc.)
Oid * argtypes
an array containing the OIDs of the data types of the parameters
Datum * values
an array of actual parameter values
const char * nulls
an array describing which parameters are null If nulls is NULL then SPI_execute_with_args assumes that no parameters are null.
bool read_only
true for read-only execution
long count
maximum number of rows to process or return

Return Value

The return value is the same as for SPI_execute.

SPI_processed and SPI_tuptable are set as in SPI_execute if successful.

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