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CHAPTER 12 PROGRAMMING DATAADAPTER AND DATASET OBJECTS
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A call to the DisplayTableValues procedure is clipped from the preceding code excerpt from the Button3_Click procedure. Figure 12-6 shows the message box that appears after you initially open the form and then successively click Button1, Button2, and Button3 while, of course, clearing the intervening message boxes. Notice that the new row with Virginia Dobson as a contact appears in the message box. The previously inserted row for Rick or Rickie Dobson is deleted. This is consistent with the code for the Button3_Click procedure.
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Figure 12-6. A single invocation of the Update method can transfer one change or multiple changes from a DataTable in a client application to a table in a database.
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Caution When working with a disconnected data source, such as a DataTable, your disconnected data source and the database can become unsynchronized. One common reason for the lack of synchronization is a change by another user. If your application tries to make any changes from an unsynchronized data source, one or more of the attempted changes can fail. The failure of an attempted change generates an Exception object. You can trap the Exception object with a Try Catch statement and then resubmit the changes. From a programming perspective, one easy way to do this is to alert the user that an error occurred, along with a request to resubmit the changes after your application refreshes the local data source from the database.
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Processing Changes to Two Tables
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The last data modification sample tackles several issues. The core part of the sample highlights one approach to changing two database tables from a client application. Although there is no explicit foreign key relationship between the tables, they are implicitly related. The input for the child table requires the recovery of an IDENTITY value from the parent table. This concluding sample also shows how to jointly use data modifications through a Command object with disconnected data sources. By using this technique, applications can benefit from the advantages of making changes directly to a database while concurrently offering the benefits of a disconnected data source. Finally, the changes implemented through a Command object demonstrate the basic syntax for using parameters with a Command object. Two procedures implement the sample: The first procedure, Button4_Click, sets up the sample. This involves creating a second table, DotNetTable2, which can act as a child table to the DotNetTable database table. In addition, the first part creates a disconnected data source that maps to the DotNetTable2 database table in the same way that the Table DataTable maps to the DotNetTable database table.
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CHAPTER 12 PROGRAMMING DATAADAPTER AND DATASET OBJECTS
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The second procedure, InsertWithSQL, performs the database modification tasks via a Command object with SQL statements and synchronizes the two database tables with the two local, disconnected data sources that map to them. The Button4_Click procedure starts by creating the DotNetTable2 database table. The procedure implementing this object is shown next. Initially, the code drops any prior table in the database pointed at by the cnn1 SqlConnection object. If the table doesn t already exist, the Try Catch Finally statement displays an error message about that fact. Next, the code excerpt runs the SQL statement for creating the DotNetTable2 database table. The CREATE TABLE statement for the DotNetTable2 database table designates three columns and a primary key constraint. The SalesID and ContactID columns jointly define the primary key that makes each row in the table unique. The Amount column stores information about the amount of a transaction defined by the combination of SalesID and ContactID column values. The ContactID column from the DotNetTable2 database table contains values that should link back to a row in the DotNetTable database table. The primary key constraint specifies that rows must be unique by the combination of their SalesID and ContactID column values. Dim cmd1 As New SqlCommand cmd1.CommandText = "DROP TABLE DotNetTable2" cmd1.Connection = cnn1 Try cnn1.Open() cmd1.ExecuteNonQuery() Catch ex As Exception MessageBox.Show(ex.Message) Finally cnn1.Close() End Try cmd1.CommandText = "CREATE TABLE DotNetTable2 (" & _ "SalesID int NOT NULL, " & _ "ContactID int NOT NULL, " & _ "Amount dec(7,2) NOT NULL," & _ "CONSTRAINT PK_TwoIDs PRIMARY KEY(SalesID, ContactID))" cmd1.Connection = cnn1 Try cnn1.Open() cmd1.ExecuteNonQuery() Catch ex As Exception MessageBox.Show(ex.Message) Finally cnn1.Close() End Try After creating the DotNetTable2 database table, the Button4_Click procedure creates a DataTable in the client application based on the database table. The name of the local DataTable mapping to the DotNetTable2 database table is Table2. The Table2 DataTable is a local data cache for the DotNetTable2 database table in the same sense that the Table DataTable is a local cache for the DotNetTable. dap2 = New SqlDataAdapter("SELECT * FROM DotNetTable2", cnn1) dap2.Fill(das1, "Table2")
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