Of all the packages in this appendix, the DBMS_OUTPUT package is the one you will find yourself using most frequently. This package allows you to display information to your session's output device in a buffer as your PL/SQL program executes. As such, it serves as just about the only easily accessible means of debugging your PL/SQL Version 2 programs. DBMS_OUTPUT is also the package you will use to generate reports from PL/SQL scripts run in SQL*Plus.
The DISABLE procedure disables all calls to the DBMS_OUTPUT package (except for ENABLE, described next). It also purges the buffer of any remaining lines of information. After you execute this command, any calls to PUT_LINE and other modules will be ignored and you will not see any output. The specification is:
PROCEDURE DBMS_OUTPUT.ENABLE (buffer_size IN INTEGER DEFAULT 2000);
PROCEDURE DBMS_OUTPUT.GET_LINE (line OUT VARCHAR2, status OUT INTEGER);
PROCEDURE DBMS_OUTPUT.GET_LINES (lines OUT CHARARR, numlines IN OUT INTEGER);
The NEW_LINE procedure inserts an end-of-line marker in the buffer. Use NEW_LINE after one or more calls to PUT in order to terminate those entries in the buffer with a newline marker. The specification is:
The PUT procedure puts information into the buffer, but does not append a newline marker into the buffer. Use PUT if you want to place information in the buffer (usually with more than one call to PUT), but not also automatically issue a newline marker. The specifications are:
PROCEDURE DBMS_OUTPUT.PUT (A VARCHAR2); PROCEDURE DBMS_OUTPUT.PUT (A NUMBER); PROCEDURE DBMS_OUTPUT.PUT (A DATE);
The PUT_LINE procedure puts information into the buffer and then appends a newline marker into the buffer. The specifications are:
PROCEDURE DBMS_OUTPUT.PUT_LINE (A VARCHAR2); PROCEDURE DBMS_OUTPUT.PUT_LINE (A NUMBER); PROCEDURE DBMS_OUTPUT.PUT_LINE (A DATE);
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