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CHAPTER 17 SELECTED PL/SQL TECHNIQUES
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p_show_date: Shows the date prefixed with your message in the final output, if it s set to YES. p_date_format: Format of the date shown (this is ignored if p_show_date is set to NO). p_name_len: Length of the name of the procedure that gets printed as a prefix. p_show_sesid: Indicates if the database session ID should be appended to the prefix that gets printed with the message. For example, the following invocation instructs that we should log messages for all modules, in the directory pointed to by the directory object TEMP in a file called debug.txt: benchmark@ORA10G> exec debug.init( p_debug_flag => debug.LOG_IN_TRACE_FILES_ONLY, p_modules => 'ALL', p_dir => 'TEMP', p_file => 'debug.txt') PL/SQL procedure successfully completed. Printing the debug Configuration The following procedure, status, prints out the configuration options we set using the previous init method: procedure status( p_user in varchar2 default user, p_dir in varchar2 default null, p_file in varchar2 default null ); The following is example output from invoking this procedure: benchmark@ORA10G> exec debug.status
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Debug info for BENCHMARK -----------------------DEBUG FLAG: Debugging output in trace files only USER: BENCHMARK MODULES: ALL DIRECTORY: TEMP FILENAME: debug.txt SHOW DATE: YES DATE FORMAT: MMDDYYYY HH24MISS NAME LENGTH: 30 SHOW SESSION ID: NO PL/SQL procedure successfully completed.
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CHAPTER 17 SELECTED PL/SQL TECHNIQUES
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Using f() to Log Messages The following procedure, f(), is one of the two procedures that you can use to log messages in your PL/SQL code. The first parameter is the message itself, and the remaining ten optional parameters enable you to log messages using C-style %s notation. procedure f( p_message in p_arg1 in p_arg2 in p_arg3 in p_arg4 in p_arg5 in p_arg6 in p_arg7 in p_arg8 in p_arg9 in p_arg10 in varchar2, varchar2 default varchar2 default varchar2 default varchar2 default varchar2 default varchar2 default varchar2 default varchar2 default varchar2 default varchar2 default
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null, null, null, null, null, null, null, null, null, null );
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For example, if you execute benchmark@ORA10G> exec debug.f( 'current user is %s, this is a number: %s', user, 10 ) you will generate the following debug message in C:\TEMP\debug.txt given the current configuration: 12082004 104635( BENCHMARK.ANONYMOUS BLOCK this is a number: 10 1) current user is BENCHMARK,
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Note The debug utility supports only the format string %s. But as you can see from this section s example,
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you can use the format string %s to print strings as well as numbers in your debug messages.
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The prefix 12082004 104635 is the date and time we logged this message (using the format that we set, namely MMDDYYYY HH24MISS). The expression BENCHMARK.ANONYMOUS BLOCK 1 tells us that this message was logged in line number 1 of an anonymous block. Note that the term ANONYMOUS BLOCK would be replaced by the procedure name in the case of a stand-alone procedure and a package name in the case of a packaged procedure. The remaining part of the message is our logged message, with substituted parameters for the username and the number. In this case, we passed two parameters, but we can use debug.f to pass up to ten parameters. If you have to pass more than ten parameters, you can use the procedure fa() described next.
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CHAPTER 17 SELECTED PL/SQL TECHNIQUES
Using fa() to Log Messages Using the procedure fa(), you can log messages with as many parameters as you like: procedure fa( p_message in varchar2, p_args in Argv default emptyDebugArgv ); For example, the following message logs 11 numbers in the message file: benchmark@ORA10G> exec debug.fa( 'This message has 11 parameters: %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s', debug.Argv(1,2,3,4,5,6,7,8,9,10, 11)) This results in the following output in the debug.txt file: 2082004 110510( BENCHMARK.ANONYMOUS BLOCK 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 1) This message has 11 parameters:
Using clear() to Clear Debug Configuration Finally, the procedure clear clears the debug configuration corresponding to the passed parameters. Once you invoke this procedure, you will not get any debug messages for the corresponding profile: procedure clear( p_user in varchar2 default user, p_dir in varchar2 default null, p_file in varchar2 default null ); Using get_debug_message() to Get Currently Logged Messages The function get_debug_message() returns a ref cursor to get all messages logged in the current debugging session. You can use this function to get messages logged from your Java code, for example (as you will see shortly): function get_debug_message return sys_refcursor; Using get_debug_message_flush() to Get Currently Logged Messages and Flush The function get_debug_message_flush() returns a ref cursor to get all messages logged in the current debugging session, and it deletes these messages from the temporary table where they get stored originally. You can use this function if you want to get messages logged but don t want to see them again the next time you invoke this function in the same session: function get_debug_message return sys_refcursor; function get_debug_message_flush return sys_refcursor ; Using debug to Instrument PL/SQL Code Let s look at a quick example of invoking this utility once it s installed. First, we need to create a directory object pointing to a directory where our debug file would be generated: benchmark@ORA10G> create or replace directory TEMP as 'C:\TEMP'; Directory created.
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