.NET/Java PDF, Tiff, Barcode SDK Library

Note If you try to create the same database twice, you will receive a runtime exception. However, if you do intend to drop an existing database, you can do so by issuing a DROP DATABASE company SQL command. The DROP command can also be used for other database artifacts, including tables, views, and stored procedures.

consistent gets physical reads redo size bytes sent via SQL*Net to client bytes received via SQL*Net from client SQL*Net roundtrips to/from client sorts (memory) sorts (disk) rows processed

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foreach(XmlNode orderItem in orderElem.ChildNodes) { int itemID = Convert.ToInt32(orderItem.Attributes["ItemId"].Value); int quantity = Convert.ToInt32(orderItem.Attributes["Quantity"].Value); bSuccess = dal.AddOrderItem(orderID, itemID, quantity); if (!bSuccess) break; } return bSuccess; } What happens when you run into an item that s not in stock The creation of the order and corresponding order items will be rolled back, but you ve lost the changes describing the order in your XML document. Your goal here is to have the instance of XMLDocument also participate in the transaction. When the transaction fails, any changes you ve made to the tree of elements in the document instance will be rolled back as well. To do this you ll create a type that extends XMLDocument. The first thing you ll need to do with this type is implement IEnlistmentNotification. Table 12-1 shows the methods this interface requires you to implement. Table 12-1. Methods of the IEnlistmentNotification Interface

Before a connection can be opened, its ConnectionString property has to be initialized, typically by passing it to the connection constructor Although you can assemble this connection string by hand, it is error prone because it is subject to various insertion traps, and the exact keys that various providers accept are many and hard to remember For these reasons, it is common to either externalize entire connection strings in configuration files (discussed next) or use a ConnectionStringBuilder object from the appropriate provider namespace This object contains all the known connection keys as properties that can be safely set, avoiding passing values of incorrect type or misspelling the key names Consider the following example (this time, using SQL Server running on localhost and referencing the company database; initially, before that database is created, you should remove the InitialCatalog reference from your connection string): open SystemData open SystemData.

SQL> set AUTOTRACE off For full details on the use of autotrace and interpretation of the data it provides, see the chapter titled Using Application Tracing Tools of Oracle Database Performance Tuning Guide and Reference (10g Release 1) in the Oracle documentation set or the chapter titled Tuning SQL*Plus of SQL*Plus User s Guide and Reference (10g Release 1).

SqlClient let connStr = new SqlConnectionStringBuilder(DataSource="localhost", IntegratedSecurity=true, InitialCatalog="company") On the other hand, not all keys accepted by the various providers are contained in these builder objects, and it is sometimes necessary to add custom key/value pairs You can do this by using the Add method For instance, for an OleDb provider, user credentials can be given as follows: connStrAdd("User Id", "your_user_id") connStrAdd("Password", "your_password") This naturally requires extra care to ensure that the proper keys are assigned You can now access the resulting connection string by reading the ConnectionString property and use it to create a connection object: let conn = new SqlConnection(connStrConnectionString) You can also store your connection strings in configuration files (webconfig for web applications or YourProgramexeconfig for regular applications) The main advantage here is that connection details can be configured without affecting the application Consider the following configuration file: < xml version='1.

Called when the transaction is being committed. Called when the outcome of the transaction is not certain (meaning, in real terms, that it s doomed). Called when the transaction is about to be committed. Called when the transaction has failed and the object should be restored to its original state.

Within a scrollable result set, you can move your position using either relative or absolute positioning: Relative positioning allows you to move a given number of rows forward or backward from the current row. Absolute positioning allows you to move to a specified row number, counting from either the beginning or the end of the result set.