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CHAPTER 17 SELECTED PL/SQL TECHNIQUES
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In our examples, the debug file will be generated in the directory C:\TEMP. We then initialize the debug utility as follows: 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. This code instructs the debug utility that we want debug messages to be generated for all modules, for the currently logged user (benchmark in this case). We should put the messages in a file called debug.txt in the directory pointed by the directory object TEMP (the operating system directory is C:\TEMP in this example). Every time we call init, it prints the configuration information in the debug.txt file as follows: Debug parameters DEBUG FLAG: USER: MODULES: DIRECTORY: FILENAME: SHOW DATE: DATE FORMAT: NAME LENGTH: SHOW SESSION ID: initialized on 08-DEC-2004 11:05:10 Debugging output in trace files only BENCHMARK ALL TEMP debug.txt YES MMDDYYYY HH24MISS 30 NO
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Once we ve initialized our debug package with a profile, we can instrument our code. The following snippet creates a procedure, demo_debug, with some instrumentation messages using the debug.f procedure: benchmark@ORA10G> create or replace procedure demo_debug 2 is 3 begin 4 debug.f( 'Inside procedure demo_debug ' ); 5 for i in 1..5 6 loop 7 debug.f( '%s, my loop counter = %s: ', 'hello', i ); 8 end loop; 9 debug.f( 'Exiting procedure demo_debug ' ); 10 11 end; 12 / Procedure created. We then initialize the debugging profile: benchmark@ORA10G> exec debug.init( p_debug_flag => debug.LOG_IN_TRACE_FILES_ONLY, p_modules => 'ALL', p_dir => 'TEMP', p_file => 'debug.txt')
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and invoke our procedure demo_debug: benchmark@ORA10G> exec demo_debug PL/SQL procedure successfully completed. This results in the following debug.txt file being generated in the directory C:\TEMP: Debug parameters DEBUG FLAG: USER: MODULES: DIRECTORY: FILENAME: SHOW DATE: DATE FORMAT: NAME LENGTH: SHOW SESSION ID: 12082004 12082004 12082004 12082004 12082004 12082004 112156( 112156( 112156( 112156( 112156( 112156( initialized on 08-DEC-2004 11:21:56 Debugging output in trace files only BENCHMARK ALL TEMP debug.txt YES MMDDYYYY HH24MISS 30 NO BENCHMARK.DEMO_DEBUG BENCHMARK.DEMO_DEBUG BENCHMARK.DEMO_DEBUG BENCHMARK.DEMO_DEBUG BENCHMARK.DEMO_DEBUG BENCHMARK.DEMO_DEBUG 4) 7) 7) 7) 7) 7) Inside hello, hello, hello, hello, hello, procedure demo_debug my loop counter = 1: my loop counter = 2: my loop counter = 3: my loop counter = 4: my loop counter = 5
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Using JDebug to Instrument Java Code The program JDebug discussed in this section invokes selected methods in the debug package. It allows you to log messages from your Java code such that your Java message logging has most of the capabilities of the debug package. This includes your Java code s ability to Turn off debugging based on a flag. Direct your debugging messages (Java and PL/SQL code) so that they can be retrieved in your Java code only, but not output to any trace files. Direct your debugging messages (Java and PL/SQL code) to be output on a trace file in the database server. Write C-style messages (using the %s format string), and pass up to ten parameters in your Java code. JDebug is listed here and interspersed with brief explanations. We begin by importing some classes: /* This class is an interface to invoke the debug package from Java. This debug package can be downloaded from the Downloads area of the Apress website at http://www.apress.com */ package book.util;
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CHAPTER 17 SELECTED PL/SQL TECHNIQUES
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java.sql.CallableStatement; java.sql.Connection; java.sql.SQLException; java.sql.ResultSet; oracle.jdbc.OracleTypes; book.util.JDBCUtil; class JDebug
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The init() method invokes the debug.init() method (explained earlier) to initialize the debugging session: public static void init ( Connection connection, String debugFlag, String modules, String directory, String debugFileName, String dbUserName, String showDateFlag, String dateFormat, int nameLength, String showSessionIDFlag ) throws SQLException { CallableStatement cstmt = null; try { cstmt = connection.prepareCall ( INIT_DEBUGGING_STMT ); cstmt.setInt ( 1, Integer.parseInt ( debugFlag ) ); cstmt.setString ( 2, modules ); cstmt.setString ( 3, directory ); cstmt.setString ( 4, debugFileName ); cstmt.setString ( 5, dbUserName ); cstmt.setString ( 6, showDateFlag ); cstmt.setString ( 7, dateFormat ); cstmt.setInt ( 8, nameLength ); cstmt.setString ( 9, showSessionIDFlag ); cstmt.executeUpdate(); } finally { JDBCUtil.close ( cstmt ); } } The clear() method invokes the debug.clear method (explained earlier) to clear the debugging profile information: public static void clear ( Connection connection, String debugFlag, String dbUserName, String directory, String debugFileName ) throws SQLException {
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