Pls_logger Logging information in Oracle

/*parameter Description: Pi_program_name program name pi_directory write log file in the same directory Pi_file log file name, must exist Pi_log_level journaling level Where INFO, WARN, FATAL pi_write_to are written, screen, FILE, TABLE, all pi_error_message error messages written to the log pi_status output parameter 1 Failed 0 Success*/BEGINPls_logger (Pi_program_name= 'Screen_program_error', Pi_log_level= 'INFO', Pi_write_to= ' Screen', Pi_error_message= 'This execution writes to screen.'                ); Pls_logger (Pi_program_name= 'Warn_program_error', Pi_log_level= 'WARN', Pi_write_to= 'TABLE', Pi_error_message= 'This execution writes to TABLE.'                ); Pls_logger (Pi_program_name= 'Fatal_program_error', Pi_log_level= 'FATAL', Pi_write_to= 'FILE', Pi_error_message= 'This execution writes to FILE.', Pi_file= 'My_logfile.txt'                ); Pls_logger (Pi_program_name= 'Fatal_program_error', Pi_log_level= 'FATAL', Pi_write_to= ' All', Pi_error_message= 'This execution writes.', Pi_file= 'My_logfile.txt'                );END;/