ASP.NET Web PDF Document Viewer/Editor Control Library

When a request enters the pipeline, it s handled by an instance of the HttpApplication class. One of the first things HttpApplication does is create an instance of HttpContext and populate it. This context object is available throughout the request processing pipeline, and exposes many familiar types. Table 2-1 provides you with a quick look at some of the members of HttpContext. Keep in mind that while many of these properties will be familiar in the context of HttpContext, they re not properties of the Page object, but properties of HttpContext.

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Let s look at the definition of the _demoPstmtFetchSize() method: private static void _demoPstmtFetchSize( Connection conn, int connLevelDefaultPrefetch, int stmtLevelFetchSize ) throws SQLException { System.out.println( "Inside _demoPstmtFetchSize" ); First, we create a SQL tag enclosed within the Oracle hint strings "/*+" and "*/" so that we can identify the statement within the tkprof output. Since the enclosed string is not a valid hint, Oracle will ignore it. Note that if you use "/*" instead of "/*+", Oracle will treat the hint string as a comment and strip it away in 10g (in 9i this is not the case). Within the dummy hint, we tuck away the fetch sizes set at the OracleConnection and PreparedStatement levels: String sqlTag = "/*+" + "(CONN=" + connLevelDefaultPrefetch + ")" + "(PSTMT=" + stmtLevelFetchSize + ")" + "*/"; Next, we form our SQL statement string, which selects a given number of rows. Note how we tag it with the sqlTag value we just created: String stmtString = "select x "+ sqlTag + " from t1 where rownum <= "; We prepare our PreparedStatement object: PreparedStatement pstmt = null; ResultSet rset = null; try { pstmt = conn.prepareStatement( stmtString ); And we print the default statement fetch size, which is the one it inherits from the OracleConnection interface: System.out.println( "\tDefault statement fetch size: " + pstmt.getFetchSize()); We then set the fetch size at the PreparedStatement object and set the total number of rows to be retrieved as 100. Finally, we execute the statement and iterate through the result set, which is followed by the finally clause: pstmt.setFetchSize( stmtLevelFetchSize ); System.out.println( "\tnew statement fetch size: " + pstmt.getFetchSize()); pstmt.setInt( 1, 100 ); rset = pstmt.executeQuery(); System.out.println( "\tResult set fetch size: " + rset.getFetchSize()); int i=0; while (rset.next()) { i++; }

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System.out.println( "\tnumber of times in the loop: " + i ); } finally { // release JDBC-related resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } } The method _demoPstmtFetchSizeWithRsetOverride() is exactly the same as the method _demoPstmtFetchSize(), except that we override the fetch size at the ResultSet object as well. Note that the SQL tag also has the ResultSet fetch size used in this case: private static void _demoPstmtFetchSizeWithRsetOverride( Connection conn, int connLevelDefaultPrefetch, int stmtLevelFetchSize, int rsetLevelFetchSize ) throws SQLException { System.out.println( "Inside _demoPstmtFetchSizeWithRsetOverride" ); String sqlTag = "/*+" + "(CONN=" + connLevelDefaultPrefetch + ")" + "(PSTMT=" + stmtLevelFetchSize + ")" + "(RSET=" + rsetLevelFetchSize + ")" + "*/"; String stmtString = "select x "+ sqlTag + " from t1 where rownum <= "; PreparedStatement pstmt = null; ResultSet rset = null; try { pstmt = conn.prepareStatement( stmtString ); System.out.println( "\tDefault statement fetch size: " + pstmt.getFetchSize()); pstmt.setFetchSize( stmtLevelFetchSize ); System.out.println( "\tnew statement fetch size: " + pstmt.getFetchSize()); pstmt.setInt( 1, 100 ); rset = pstmt.executeQuery(); rset.setFetchSize( rsetLevelFetchSize ); System.out.println( "\tnew result set fetch size: " + rset.getFetchSize()); int i=0; while (rset.next()) { i++; } System.out.println( "\tnumber of times in the loop: " + i ); } finally {

An instance of the Application object This type is a holdover from classic ASP sticking , around for backwards compatibility There s nothing this object can do that the cache can t do better This property points back to the instance of HttpApplication that s processing the request The ASPNET cache object Another instance that s familiar within Page processing, but is also available outside of handler processing An instance of the handler that rendered the previous page This is used in crosspage postbacks to expose information about the page that rendered the HTML that caused the postback This is exposed at the page level as the PreviousPage property Used by the personalization infrastructure It s an instance of the current user s profile object The old familiar request object Use this to examine the details of the request that has come into the server.