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Notice how the select statement has for input parameters. The query will get us all employees of a given job title and hire date earlier than a given date. Next, we prepare the statement pstmt = conn.prepareStatement( stmtString ); We then bind the parameters. The first parameter is a string for the job column of the emp table; hence we use the setString() method, passing the constant that defines the job column index value of 1 and the parameter value of CLERK. pstmt.setString(JOB_COLUMN_INDEX, "CLERK" ); For the hiredate column, we pass the current date. The parameter index is the constant HIREDATE_COLUMN_INDEX with the value 2 in this case: pstmt.setDate(HIREDATE_COLUMN_INDEX, new java.sql.Date( new java.util.Date().getTime())); Notice that the date value is of type java.sql.Date, not java.util.Date. We execute the statement next. Since it is a query, we use the executeQuery() method: rset = pstmt.executeQuery(); Finally, we end the method after printing the results of the query and closing the result set and statement: // print the result System.out.println( "printing query results ...\n"); while (rset.next()) { int empNo = rset.getInt ( 1 ); String empName = rset.getString ( 2 ); String empJob = rset.getString ( 3 ); System.out.println( empNo + " " + empName + " " + empJob ); } } finally { // release JDBC-related resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } } Let s look at how we can execute the same query, but this time binding parameters by name. The method _demoBindingByParameterName() begins by declaring variables and starting a try catch block: private static void _demoBindingByParameterName( Connection conn ) throws SQLException { String stmtString = "select empno, ename, job " +

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When code is running outside ASP.NET, it relies on System.Threading.Thread.CurrentPrincipal to maintain the user s principal object. On the other hand, when code is running inside ASP.NET, the only reliable way to find the user s principal object is through HttpContext.Current.User.

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"from emp where job = :job and hiredate < :hiredate"; System.out.println( "\nCase 2: bind parameter by name\n"); System.out.println( "Statement: " + stmtString ); OraclePreparedStatement opstmt = null; ResultSet rset = null; final int SELECT_CLAUSE_EMPNO_COLUMN_INDEX = 1; final int SELECT_CLAUSE_ENAME_COLUMN_INDEX = 2; final int SELECT_CLAUSE_JOB_COLUMN_INDEX = 3; try { Note that this time we use the parameter names :job and :hiredate for our input parameters. Notice also that we have to use the OraclePreparedStatement interface. The first step involves preparing the statement with the query: opstmt = (OraclePreparedStatement) conn.prepareStatement( stmtString ); Next, we bind the job parameter with the value CLERK using the setStringAtName() method of the OraclePreparedStatement interface (note that there is no : in the string we pass as the parameter name): opstmt.setStringAtName("job", "CLERK" ); We bind the hiredate parameter with the current date value: opstmt.setDateAtName("hiredate", new java.sql.Date( new java.util.Date().getTime())); The next steps of executing the query, printing the results, and releasing the resources are the same as in the previous example. This also ends our class listing. // execute the query rset = opstmt.executeQuery(); // print the result System.out.println( "printing query results ...\n"); while (rset.next()) { int empNo = rset.getInt ( SELECT_CLAUSE_EMPNO_COLUMN_INDEX ); String empName = rset.getString ( SELECT_CLAUSE_ENAME_COLUMN_INDEX ); String empJob = rset.getString ( SELECT_CLAUSE_JOB_COLUMN_INDEX ); System.out.println( empNo + " " + empName + " " + empJob ); } } finally { // release JDBC-related resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( opstmt ); } } } // end of program

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Developing Web applications follows the same principles as developing applications for the Windows client supplied with Axapta; however, the user interface is a browser, which places a series of constraints on what is technically possible. As you have seen, the AOT Web group contains a series of object types that are specific to Web applications, and that you should use instead of the normal object types, but otherwise the big difference is this: the user interface of your application must somehow be made available to a Web server that can then service Web browsers functioning as clients.

Normally, this would mean that you would have to write code to detect whether HttpContext. Current is null, and only use System.Threading if HttpContext isn t available. The User property automates this process on your behalf: public static IPrincipal User { get { if (HttpContext.Current == null) return Thread.CurrentPrincipal; else return HttpContext.Current.User; } set { if (HttpContext.Current != null) HttpContext.Current.User = value; Thread.CurrentPrincipal = value; } } In general, Csla.ApplicationContext.User should be used in favor of using either System. Threading or HttpContext directly, since it automatically adjusts to the environment in which your code is running. With CSLA .NET based applications, this is particularly important, because your client code could be a Windows Forms application, but your server code could be running within ASP .NET. Remember that your business objects run in both locations and so must behave properly both inside and outside ASP.NET.

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