Linux cli command CALL

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command CALL and provides detailed information about the command CALL, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the CALL.

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NAME 🖥️ CALL 🖥️

invoke a procedure

SYNOPSIS

CALL name ( [ argument ] [, ...] )

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 OUT parameters. However, arguments matching OUT parameters are not evaluated, so its customary to just write NULL for them. (Writing something else for an OUT parameter 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.

EXAMPLES

CALL do_db_maintenance();

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.

SEE ALSO

CREATE PROCEDURE (CREATE_PROCEDURE(7))

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