ASP.NET Web PDF Document Viewer/Editor Control Library

stmt.execute( stmtStr ); } finally { stmt.close(); } } We are now ready to demonstrate the impact of session cursor cache. First, we create a simple table, t1, with just one numeric column in which we insert the numbers 1 to 10,000: benchmark@ORA10G> create table t1 as 2 select rownum as x 3 from all_objects 4 where rownum <= 10000; Table created. benchmark@ORA10G> select count(*) from t1; COUNT(*) ---------10000 The following DemoSessionCachedCursors class compares two cases: Case 1: We run the select from table t1 10,000 times with session cached cursors set to 0. Case 2: We run the select from table t1 10,000 times with session cached cursors set to 500. /** This program demonstrates the impact of session cursor cache. * COMPATIBLITY NOTE: * runs successfully against and */ import java.sql.SQLException; import java.sql.ResultSet; import java.sql.Connection; import java.sql.PreparedStatement; import book.util.JDBCUtil; import book.util.JRunstats; class DemoSessionCachedCursors { public static void main(String args[]) throws Exception { Connection conn = null; // first parameter: database name try { // get connection - auto commit is off conn = (Connection) JDBCUtil. getConnection("benchmark", "benchmark", args[0]);

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NET 2K3, this means the Web Project Assembly failed to get created when compiling, and the completely unrelated change you made to your code-behind in Defaultaspx is not baked into a new version of the Assembly In this environment, though, compilation is optional The fact that the compile failed is irrelevant You can right-click on Defaultaspx in Solution Explorer and tell the IDE to display it in the browser The IDE fires up a browser instance and, voila! the page appears just fine, as demonstrated in Figure 3-10 This demonstrates a couple of interesting things First, when you make a change to a code-behind file, you don t have to recompile If you just request the page anew, your change shows up In VS NET 2K3 this is true if you make a change to an aspx file.

[v] else failwith ("unbound variable: " + v) | Int i -> i | Plus (e1, e2) -> evalE env e1 + evalE env e2 | Minus (e1, e2) -> evalE env e1 - evalE env e2 | Times (e1, e2) -> evalE env e1 * evalE env e2 and eval (env: Map<string, int>) = function | Assign (v, e) -> envAdd(v, evalE env e) | While (e, body) -> let rec loop env e body = if evalE env e <> 0 then loop (eval env body) e body else env loop env e body | Seq stmts -> List.

We will use the JRunstats utility class (discussed in the section JDBC Wrapper for runstats of 1) for comparing the two cases. We begin by preparing the benchmark statements in the class JRunstats: JRunstats.prepareBenchmarkStatements ( conn ); We mark the beginning of the benchmark run next: JRunstats.markStart ( conn ); We set the session cached cursors to 0 in the first scenario, effectively disabling it: JDBCUtil.setSessionCachedCursors( conn, 0 ); We execute the following query from t1 10,000 times (we don t need to retrieve the results for our test case): String stmtString = "select x from t1"; PreparedStatement pstmt = null; ResultSet rset = null; for( int i=0; i < 10000; i++ ) { try { pstmt = conn.prepareStatement( stmtString ); rset = pstmt.executeQuery(); } finally { // release resources associated with JDBC in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } }

Without recompiling, the change shows up on the next request to the page Now, since all compilation is put off until runtime, the same is true of code-behind changes The other interesting thing this demonstrates is that not everything in the site has to be working in order to request pages in the site With version 1x of the Framework, this is not true, because if there are any problems in the code-behind you cannot successfully build the Web Project Assembly..

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