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The Connection class sets up the information necessary to attach to a database. It has a number of properties available to specify this information, such as username and password, as well as, of course, the location of the database. After creating (often called instantiating) the Connection object and setting its properties correctly, you ll call the Open() method of the Connection object, which actually creates the connection to the database and opens it. Let s recall the code in 3 to write out test data into a database. Listing 8-1 and Listing 3-10 are essentially the same listing. At that time, we used this code for writing test results into a database. (Notice that we chose to use the System.Data.OleDb libraries since we were writing to a Microsoft Access database.) Listing 8-1. Writing Test Results to a Microsoft Access Database VB .NET Imports System.Data.OleDb Dim cn As New OleDbConnection _ ("Provider=Microsoft.jet.oledb.4.0;Data Source=TestResultsDB.mdb") Dim intRet As Integer cn.Open() Dim cmd As New OleDbCommand( _ "Insert into TestResults (TestID, TestDate, Reqmt, Tester, Result) " & _ "Values (3, '01-Jan-2006', 'Test Reqmt ABC', 'M. Sweeney', 1)", cn)

I first want to cover the tasks that you can do while you re writing your code. It s a good idea to build up a library of debugging code that is at your disposal. You ll want to do this early on so that you can use this code throughout development. Doing so will help you catch bugs sooner and make tracking them down a lot easier.

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intRet = cmdExecuteNonQuery cnClose() C# using SystemDataOleDb OleDbConnection cn = new OleDbConnection ("Provider=Microsoftjetoledb40;Data Source=TestResultsDBmdb"); int intRet; cnOpen(); OleDbCommand cmd = new OleDbCommand( "Insert into TestResults (TestID, TestDate, Reqmt, Tester, Result) " + "Values (3, '01-Jan-2006', 'Test Reqmt ABC', 'M Sweeney', 1)", cn); intRet = cmdExecuteNonQuery(); cnClose(); This time, we ll focus our attention on the ADONET classes used to create this code: The first line imports the correct library where the ADONET classes reside: SystemDataOleDb The second line declares our ADONET Connection object and names it cn It is in this line that you will need to provide all information necessary to access the database Any username and password information will be inserted here, depending on the type of database (This code presumes the default set up for Microsoft Access installations, ie.

The JDBC views a database in terms of catalog, schema, table, view, column, triggers, indexes, and stored procedures. The JDBC view of a database s internal structure appears in Figure 3-3.

Asserts are checks that you can put in your app that cause the application to halt if it fails a condition. C++ has a built-in call that you can use, as does Objective-C. For example, in C++, the following assert checks to see whether the condition is true:

, no password) Listing 8-2 displays connection declarations for Oracle and SQL Server databases for both VB NET and C# The line cnopen will establish the connection to the database using the criteria set up in the preceding line The statement following the Open() method of the Connection object creates a Command object called cmd This declaration also loads this new Command object with a SQL statement to insert values into the TestResults table Notice that the very last part of this statement specifies that the cn Connection object is to be used This is because a Command object can be associated with any connection This is part of the flexibility of ADONET After the Command object is created, it is executed with its ExecuteNonQuery() method, as shown in the following code line: intRet=cmd.

assert(myVariable == someOtherVariable);

ExecuteNonQuery() The ExecuteNonQuery() method is used for queries that will not return any rows from the database In this case, the Insert method is used The ExecuteNonQuery() method will return an integer that represents the number of rows affected In this case, if the Insert executes without error, then a return value of 1 will be returned into the intRet variable In Listing 8-1, we imported the OleDb libraries Listing 8-2 gives you similar code for the other three data providers: Oracle, SQL Server, and ODBC..

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