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CHAPTER 12 PROGRAMMING DATAADAPTER AND DATASET OBJECTS
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The final line in the Button4_Click procedure calls the InsertWithSQL procedure. It is this second procedure that performs inserts for the DotNetTable and DotNetTable2 database tables. The InsertWithSQL procedure also synchronizes the Table and Table2 DataTable objects with their corresponding database tables. The following excerpt from the InsertWithSQL procedure shows the syntax for populating the DotNetTable database table with values and synchronizing the updated database table with the first DataTable in the das1 DataSet. The code segment demonstrates the use of parameters in an INSERT statement: You must reference the parameters in the INSERT statement for the SqlCommand object. You must add the named parameters to the Parameters collection for the SqlCommand object. Use the Add method for the Parameters collection of a SqlCommand object to add a new parameter to the collection. As with arguments for the Add method, you can specify the parameter name, the SQL Server data type, and the maximum length in characters if you are dealing with a parameter that has an nvarchar data type. You must assign a value to each parameter. The following syntax combines this step with the addition of a parameter to the Parameters collection, but you can also assign a value to a parameter in a separate statement. The parameters are for the ContactName and ContactEAddr columns in the DotNetTable database table. After parameters are added to a SqlCommand object, you must assign values to them before invoking the ExecuteNonQuery method for the SqlCommand object. The addition of a second row by the procedure illustrates the syntax for using this approach. You can contrast the syntax with the syntax for the first row added by the procedure. Notice that with the reuse of the previously created parameters all you have to do is reference a parameter name and assign a value to the Value property of a parameter. After adding both rows to the DotNetTable database table, the procedure invokes the Fill method for the dap1 SqlDataAdapter. This step synchronizes the Table DataTable values with the current values in the DotNetTable database table. Dim cmd1 As SqlCommand = New SqlCommand cmd1.CommandText = "INSERT DotNetTable VALUES(@Name, @EAddr)" cmd1.Connection = cnn1 cmd1.Parameters.Add("@Name", SqlDbType.NVarChar, 25).Value = _ "Rick Dobson" cmd1.Parameters.Add("@EAddr", SqlDbType.NVarChar, 60).Value = _ "rickd@cabinc.net" cnn1.Open() cmd1.ExecuteNonQuery() cmd1.Parameters("@Name").Value = "Virginia Dobson" cmd1.Parameters("@EAddr").Value = "virginiad@cabinc.net" cmd1.ExecuteNonQuery() cnn1.Close() das1.Tables(0).Clear() dap1.Fill(das1, das1.Tables(0).TableName)
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CHAPTER 12 PROGRAMMING DATAADAPTER AND DATASET OBJECTS
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The next excerpt from the InsertWithSQL procedure shows comparable code for adding two rows to the DotNetTable2 database table. This excerpt also synchronizes the Table2 DataTable with the DotNetTable2 database table after adding the two new rows. The SQL syntax for adding a new row to the DotNetTable2 database is different from that for the DotNetTable database table for three reasons: First, there is no column in the DotNetTable2 database table with an IDENTITY property. Therefore, an INSERT statement must specify values for every column in the database table. Second, the ContactID column value in the DotNetTable2 database table must match at least one corresponding value in the ContactID column value of the DotNetTable database. Third, the rows of the DotNetTable2 database table must be unique by the combination of SalesID and ContactID, because the code for creating DotNetTable2 database table has a primary key based on both its SalesID and ContactID columns. The sample values inserted with the following code has unique SalesID column values, but it is permissible for the SalesID column values to duplicate within the column so long as they are unique for any given ContactID column value. Dim cmd2 As SqlCommand = New SqlCommand cmd2.CommandText = _ "INSERT DotNetTable2 VALUES(@SalesID, @ContactID, @Amount)" cmd2.Connection = cnn1 If das1.Tables(1).Rows.Count = 0 Then int1 = 1 cmd2.Parameters.Add("@SalesID", SqlDbType.Int).Value = int1 Else int1 += 10 cmd2.Parameters.Add("@SalesID", SqlDbType.Int).Value = int1 End If cmd2.Parameters.Add("@ContactID", SqlDbType.Int).Value = _ das1.Tables(0).Rows(das1.Tables(0).Rows.Count - 2)("ContactID") cmd2.Parameters.Add("@Amount", SqlDbType.Decimal).Value = 75 cnn1.Open() cmd2.ExecuteNonQuery() If das1.Tables(1).Rows.Count = 0 Then cmd2.Parameters("@SalesID").Value = 2 int2 = 2 Else int2 += 10 cmd2.Parameters("@SalesID").Value = int2 End If cmd2.Parameters("@ContactID").Value = _ das1.Tables(0).Rows(das1.Tables(0).Rows.Count - 1)("ContactID") cmd2.Parameters("@Amount").Value = 26 cmd2.ExecuteNonQuery() cnn1.Close() dap2.Fill(das1, das1.Tables(1).TableName)
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