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Here are a few more details about the CommandBuilder object and some of its limitations:
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The original SELECT command assigned to the DataAdapter (which is also exposed by the SelectCommand property) can reference only one table. The source table must include a primary key or at least a column with a unique constraint, and the result returned by the SELECT statement must include that col umn. Primary keys consisting of multiple columns are supported. The InsertCommand object inserts only the columns that are updatable and cor rectly omits identity, timestamp, and calculated columns and in general all col umns that are generated by the database engine. The UpdateCommand object uses the values of all the original columns in the WHERE clauses, including the primary key, but correctly omits timestamp and cal culated columns from the SET clause. The DeleteCommand object uses the values of all the original columns in the WHERE clause to locate the row that has to be deleted. The SqlCommandBuilder and OdbcCommandBuilder generate invalid commands when the name of a table or a column contains a space or a special character. (This isn t a problem with the OleDbCommandBuilder object.)
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You can easily solve the last problem by forcing the SqlCommandBuilder or OdbcCom mandBuilder to use a prefix and a suffix for all the table and column names used in the generated command. You can do this by assigning a string to the QuotePrefix and QuoteSuffix properties so that the resulting SQL text conforms to the syntax expected by the target database:
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cmdBuilder.QuotePrefix = [" cmdBuilder.QuoteSuffix = ]
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Keep in mind that the CommandBuilder executes the SQL command assigned to the SelectCommand s CommandText property to generate the other three commands, so if you later change the SELECT command, the read and update commands will be out of sync. For this reason, you should always invoke the CommandBuilder s RefreshSchema method anytime you modify the SelectCommand property.
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Customizing Insert, Update, and Delete Commands
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After you understand how the InsertCommand, UpdateCommand, and DeleteCom mand properties work, it s relatively easy to create your custom commands. This tech nique requires that you write more code than you have to when using the CommandBuilder object, but it lets you generate faster and more scalable code, both because you avoid one round trip to the server and because a well-written command can reduce the number of update conflicts. In general, the InsertCommand object pro duced by the CommandBuilder is OK for most purposes. So in the following discus sion, I ll focus only on the UpdateCommand and DeleteCommand objects.
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Part V:
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The DELETE command generated by the CommandBuilder uses the original values of all the columns in its WHERE clause to locate the record that has to be deleted. This approach implements the so-called optimistic lock strategy, which is the safest one because it ensures that no record is deleted if another user has changed one or more columns in the meantime. In some applications, however, it might make sense to adopt a different strategy for deletions and decide to delete the record even if another user has modified any of its fields (other than the primary key). According to this strategy, sometimes dubbed as the-last-one-wins strategy, the most recent edit operation always wins and successfully updates the record (unless another user has deleted the record or changed its primary key field). You can enforce this strategy simply by using only the primary key field in the WHERE clause. This technique is faster and more scalable, but you should ensure that it doesn t invalidate the business logic of your application. For example, you might decide that it s legal for a user to delete the record of an author in the Biblio database even though another user has modified the same author s data in the meantime. You can enforce this strategy by manufacturing the DeleteCommand yourself:
Create a delete command that filters records by their Au_ID field only. Dim cmdDelete As New OleDbCommand( DELETE FROM Authors WHERE Au_ID = ", cn) Create a parameter, and set its properties. With cmdDelete.Parameters.Add( @p1", OleDbType.Integer) This is the name of the column in the DataTable.
.SourceColumn = Au_ID"
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