.NET/ASP.NET/C#/VB.NET PDF Document SDK

We will now demonstrate each of these steps as part of the definition of the method _demoSelectAsARRAYAndCustomClassObject() presented here. The method _demoSelect AsARRAYAndCustomClassObject() materializes the collection as an ARRAY object and its members as Address objects as follows: private static void _demoSelectAsARRAYAndCustomClassObject( Connection conn ) throws SQLException, ClassNotFoundException { PreparedStatement pstmt = null; ResultSet rset = null; try { The first step is to add an entry to the type map of the Connection object. In this case, we specify that the database object instance of object type address should be mapped to an object of the Address class: Map map = conn.getTypeMap(); map.put( "BENCHMARK.ADDRESS", Class.forName(Address.class.getName()) ); The next step is to prepare and execute a statement that selects the nested table column emp_address_list from the table emp_table: String stmtString = "select emp_address_list from emp_table"; pstmt = conn.prepareStatement( stmtString ); rset = pstmt.executeQuery(); while( rset.next() ) { We retrieve the collection as an ARRAY object by executing the getArray() method of the ResultSet interface: ARRAY array =( ARRAY ) rset.getArray(1); Finally, we retrieve the entire array as an array of Address objects by executing the method getArray() of the ARRAY object. We can then loop through this array to access individual elements and their attributes (we print only two attributes of the Address attributes for demonstration purpose): Object[] arrayInJava = (Object[])array.getArray(); for( int i=0; i < arrayInJava.length; i++ ) { Address address = (Address) arrayInJava[i]; System.out.println( address.getLine1() ); System.out.println( address.getState() ); } } } finally {

qr code generator vb.net code project, barcodelib.barcode.winforms.dll download, winforms code 128, gs1 128 vb.net, vb.net ean 13, pdf417 vb.net, itextsharp remove text from pdf c#, replace text in pdf using itextsharp in c#, vb.net data matrix generator vb.net, c# remove text from pdf,

loops in your code. However, they are sometimes overused in functional programming and can be hard for novice users to read and understand. Take the time to document uses of these operators, or consider using them to build simpler operators that apply a particular accumulation function.

Here s a method that uses TranasactionScope to do its work in a transaction. (See XAction.cs in the App_Code directory of the Web12 project.) public bool UpdateQuantity(int itemId, int quantity) { using (TransactionScope tx = new TransactionScope(TransactionScopeOption.Required)) { AuditItemUpdate(itemId, quantity); string sql = "UPDATE Inventory SET OnHand = OnHand - @quantity " + "WHERE InventoryID = @inventoryID and " + "OnHand - @quantity >= 0"; SqlConnection cn = new SqlConnection(connStr); SqlCommand cm = new SqlCommand(sql, cn); cm.Parameters.Add(new SqlParameter("@quantity", SqlDbType.Int)).Value = quantity; cm.Parameters.Add(new SqlParameter("@inventoryID", SqlDbType.Int)).Value = itemId; cn.Open(); int i = cm.ExecuteNonQuery(); cn.Close(); if (i==1) { tx.Complete(); } return Convert.ToBoolean(i); } } Here the TransactionScope is declared within the C# using statement. The TransactionOption enum has three values: Required, RequiresNew, and Suppress. These are a lot like the transaction options available in COM+. They can affect the transactional behavior of your method in the context of any transaction that exists in the call stack calling the method. In other words, with the setting of Required, if a transaction already exists, the work this method does will participate in that transaction; otherwise, a new one will be created. The syntax of the TransactionScope simplifies the semantics of transaction management so much, that it s easy to miss it entirely unless you look closely. Here s the code that s managing the transaction for this method.

JDBCUtil.close( rset); JDBCUtil.close( pstmt); } }

Using aggregate operators to form queries is closely related to the sequence expression notation described in 3 and is used frequently in this book For example, namesSalesOver30 defined previously can also be defined as follows: seq { for (name, age, dept) in people do if (age >= 30 && dept = "Sales") then yield name } This is simply a different notation for the same computation For very simple queries, F# sequence expressions also support an even more compact form where if/then clauses are replaced by when, the final do is dropped from the for statement, and yield is replaced by ->: seq { for (name, age, dept) in people when (age >= 30 && dept = "Sales") -> name } There is no difference between these two sequence expressions it s just a matter of syntax You can use sequence expressions in conjunction with the |> operator.