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Table 2-2: OleDbConnection Properties Property Meaning as provided by the OLE DB Data Provider State A ConnectionS tate value indicating the current state of the Connection The string used to connect to the data source when the Open method is executed The maximum time the Connection object will continue attempting to make the connection before throwing an exception The name of the database to be opened once a connection is opened The location and file containing the database The size of network packets used to communicate with SQL Server The version of SQL Server being Closed Default
Table 2-3: SqlConnection Properties ConnectionString Empty
ConnectionTimeout
15 secon ds
Database
Empty
DataSource
Empty
PacketSize
8192 bytes
ServerVersion
Empty
used State A ConnectionS tate value indicating the current state of the Connection A string identifying the database client, or, if that is not specified, the name of the workstation Closed
WorkStationID
Empty
As you can see, the two versions of the Connection object expose a slightly different set of properties: The SqlDbConnection doesn t have a Provider property, and the OleDbConnection doesn t expose PacketSize or WorkStationID. To make matters worse, not all OLE DB Data Providers support all of the OleDbConnection properties, and if you re working with a custom Data Provider, all bets are off. What this means in real terms is that we still can t quite write code that is completely data source-independent unless we re prepared to give up the optimization of specific Data Providers. However, as we ll see, the problem isn t as bad as it might at first seem, since the .NET Framework provides a number of ways to accommodate run-time configuration. Rather more tedious to deal with are the different names of the objects, but using an intermediate variable can minimize the impact, as we ll see later in this chapter. The ConnectionString Property The ConnectionString is the most important property of any Connection object. In fact, the remaining properties are read-only and set by the Connection based on the value provided for the ConnectionString. All ConnectionStrings have the same format. They consist of a set of keywords and values, with the pairs separated by semicolons, and the whole thing is delimited by either single or double quotes: "keyword = value;keyword = value;keyword = value" Keyword names are case-insensitive, but the values may not be, depending on the data source. The use of single or double quotes follows the normal rules for strings. For example, if the database name is Becca s Data, then the ConnectionString must be delimited by double quotes: Database=Becca s Data . Database = Becca s Data would cause an error. If you use the same keyword multiple times, the last instance will be used. For example, given the ConnectionString database=Becca s Data; database=Northwind , the initial database will be set to Northwind. The use of multiple instances is perfectly legal; no syntax error will be generated. ADO Unlike ADO, the ConnectionString returned by the .NET Framework is the same as the user-set string, with the exception that the user name and password are returned only if Persist Security Info is set to true (it is false by default).
Unfortunately, the format of the ConnectionString is the easy part. It s determining the contents that can be difficult because it will always be unique to the Data Provider. You can always cheat (a little) by creating a design time connection using the Data Link Properties dialog box, and then copying the values. The ConnectionString can only be set when the Connection is closed. When it is set, the Connection object will check the syntax of the string and then set the remaining properties (which, you ll remember, are read-only). The ConnectionString is fully validated when the Connection is opened. If the Connection detects an invalid or unsupported property, it will generate an exception (either an OleDbException or a SqlDbException, depending on the object being used). Setting a ConnectionString Property In this exercise, we ll set the ConnectionString for the SqlDbConnection that we created in the previous exercise. The ConnectionString that your system requires will be different from the one in my installation. (I have SQL Server installed locally, and my machine name is BUNNY, for example.) Fortunately, the DataAdapter Configuration Wizard in 1 created a design time Connection for you. If you select that connection in the Server Explorer, you can see the values in the Properties window. In fact, you can copy and paste the entire ConnectionString from the Properties window if you want. (If you didn t do the exercise in 1, you can create a design time connection by using the technique described in the Add a Design Time Connection exercise in this chapter.) Set a ConnectionString Property
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