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We ll use the JRunstatsprogram described in the previous chapter to compare the two approaches. The program first uses the PreparedStatement class to execute the insert statements with bind variables. It then uses the Statement class to execute the insert statements without bind variables. The program begins by importing relevant Java classes and getting a connection to our 10g database: /* This program demonstrates the importance of using bind variables*/ import java.sql.SQLException; import java.sql.PreparedStatement; import java.sql.Statement; import java.sql.Connection; import book.util.JDBCUtil; import book.util.JRunstats; public class DemoBind { public static void main(String[] args) throws Exception { Connection conn = null; try { conn = JDBCUtil.getConnection("benchmark", "benchmark", "ora10g"); We then prepare all the statements used by the JRunstats program: JRunstats.prepareBenchmarkStatements( conn ); We follow this up by marking the beginning of the benchmark run. We then invoke _insertWithBinds() (a private method that inserts 10,000 records with bind variables), mark the middle of the benchmark run, and invoke _insertWithoutBinds() (a private method that inserts 10,000 records without bind variables): JRunstats.markStart( conn ); _insertWithBind( conn ); JRunstats.markMiddle( conn ); _insertWithoutBind( conn ); Finally, we invoke the JRunstats methodthat marks the end of the benchmarking and prints out the benchmarking results: JRunstats.markEnd( conn ); } catch (SQLException e)

{ // handle the exception properly - in this case, we just // print the stack trace. JDBCUtil.printException ( e ); } finally { // release the JDBC resources in the finally clause. JRunstats.closeBenchmarkStatements( conn ); JDBCUtil.close( conn ); } } The _insertWithBind() method uses the PreparedStatement interface to execute the 10,000 inserts: private static void _insertWithBind( Connection conn ) throws SQLException { PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement( "insert into t1(x) values( ) " ); for( int i=0; i < 10000; i++ ) { pstmt.setInt( 1, i ); pstmt.executeUpdate(); } } finally { // release JDBC-related resources in the finally clause. JDBCUtil.close( pstmt ); } } The _insertWithoutBind() method uses the Statement interface to execute the 10,000 inserts without using bind variables: private static void _insertWithoutBind( Connection conn ) throws SQLException { Statement stmt = null; try { stmt = conn.createStatement(); for( int i=0; i < 10000; i++ ) { stmt.executeUpdate( "insert into t1( x ) values( " + i + ")" ); } }

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Figure 7-11. ASP .NET AJAX Calendar control (Year view)

finally { // release JDBC-related resources in the finally clause JDBCUtilclose( stmt ); } } } The important thing to note in the DemoBind class is that in the case where we use bind variables, only one statement string is submitted to Oracle: insert into t1 ( x ) values ( ) Here, is the bind variable that is bound at runtime to the values 1, 2, 10,000 in the loop In the case where we don t use bind variables, Oracle sees a different insert statement for each value being inserted (insert into t1 ( x ) values ( 0 ) for a value of 0, insert into t1 ( x ) values ( 1 ) for a value of 1, and so on) Since Oracle has to parse each new query and generate a query execution plan, this approach doesn t scale well at all.

In our example, Oracle has to process 10,000 spuriously different statements when we don t use bind variables Let s run the program to see how these two approaches compare: URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521) (HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) ------- Benchmark Results -------Results from RUNSTATS utility Run1 ran in 43 hsecs Run2 ran in 214 hsecs run 1 ran in 2009% of the time As you can see, the approach that uses bind variables runs substantially faster It completes in about 1/5 the time of the alternative that does not use bind variables This in itself is a very good reason to use bind variables in your code However, it is even more critical to understand the importance of differences in consumption of latches in the two approaches You can see this from the next section of the JRunstatsreport: Name Run1 STAT..messages sent 3 STAT...

Lastly, if you wanted to have a little button next to the text box as the agent to open the calendar, all you have to do is set the PopupButtonID property of this control to the ID of the button.

calls to kcmgcs 5 <-- trimmed to conserve space --> STAT..session pga memory max 131,072 Run2 4 6 0 Diff 1 1 -131,072.

Run1 latches total versus runs -- difference and pct Run1 Run2 Diff Pct 16,883 126,673 109,790 13.33% The approach that uses bind variables consumes approximately 13% of the latches as compared to the alternative that does not use bind variables.

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