PostgreSQL
Description
CALL executes a procedure.
If the procedure has any output parameters, then a result row will be returned, containing the values of those parameters.
Parameters
- `name`
-
The name (optionally schema-qualified) of the procedure.
- `argument`
-
An argument expression for the procedure call. + Arguments can include parameter names, using the syntax `name
+ ⇒ `_`+value_. This works the same as in ordinary function calls; see Section 4.3 for details. + Arguments must be supplied for all procedure parameters that lack defaults, including `OUTparameters. However, arguments matchingOUTparameters are not evaluated, so it’s customary to just writeNULLfor them. (Writing something else for anOUTparameter might cause compatibility problems with future PostgreSQL versions.)
Notes
The user must have EXECUTE privilege on the procedure in order to be allowed to invoke it.
To call a function (not a procedure), use SELECT instead.
If CALL is executed in a transaction block, then the called procedure cannot execute transaction control statements. Transaction control statements are only allowed if CALL is executed in its own transaction.
PL/pgSQL handles output parameters in CALL commands differently; see Section 43.6.3.
Compatibility
CALL conforms to the SQL standard, except for the handling of output parameters. The standard says that users should write variables to receive the values of output parameters.
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