Once you have completed the previous operations, an interactive system is available. The system can also be used in batch or within command procedures. Each command handled interactively can also be executed from a program, using either exec_command (for simple commands), or exec_program (to execute a procedure, or complex commands calling such procedures).
call exec_command{command,error}
call exec_program(command)
where command is a character string containing the command to be executed.
exec_command is reserved to execute atomic commands, and return an error
in case of problems. On the other hand, exec_program is typically called
with command= '@ MyProcedure'. It cannot return an error, but the procedure
or code being executed must have its own error handling mechanism.