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2005年10月20日
[VB.NET|Access] レコードの削除・挿入・更新(OleDb)
http://support.microsoft.com/kb/301248/
Imports System.Data.OleDb Private Conn As OleDbConnection Private DA As OleDbDataAdapter Private DS As DataSet
Private Sub frm_OleDB_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.LoadDim Cmd_Select As OleDbCommand
Dim Cmd_Update As OleDbCommand
Dim Cmd_Delete As OleDbCommand
Dim Cmd_Insert As OleDbCommandDim strConn As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\テストDB.mdb"
Dim SQL_Select As String
Dim SQL_Update As String
Dim SQL_Insert As String
Dim SQL_Delete As StringTry
Conn = New OleDbConnection(strConn)
DA = New OleDbDataAdapter'--- SELECT
SQL_Select = "SELECT * FROM TEST ORDER BY TESTFIELD1 ASC"
Cmd_Select = New OleDbCommand(SQL_Select, Conn)
DA.SelectCommand = Cmd_Select'--- UPDATE
SQL_Update = "UPDATE TEST SET TESTFIELD2 = ? WHERE TESTFIELD1 = ?"
Cmd_Update = New OleDbCommand(SQL_Update, Conn)
Cmd_Update.Parameters.Add("@Field2", OleDbType.VarChar, 50, "TESTFIELD2")
Cmd_Update.Parameters.Add("@Field1", OleDbType.Integer, 2, "TESTFIELD1")
DA.UpdateCommand = Cmd_Update'--- DELETE
SQL_Delete = "DELETE FROM TEST WHERE TESTFIELD1 = ?"
Cmd_Delete = New OleDbCommand(SQL_Delete, Conn)
Cmd_Delete.Parameters.Add("@Field1", OleDbType.Integer, 2, "TESTFIELD1")
DA.DeleteCommand = Cmd_Delete'--- INSERT
SQL_Insert = "INSERT INTO TEST VALUES (?, ?)"
Cmd_Insert = New OleDbCommand(SQL_Insert, Conn)
Cmd_Insert.Parameters.Add("@Field1", OleDbType.Integer, 2, "TESTFIELD1")
Cmd_Insert.Parameters.Add("@Field2", OleDbType.VarChar, 50, "TESTFIELD2")
DA.InsertCommand = Cmd_Insert'--- DataSet
DS = New DataSet
DA.Fill(DS, "TEST")'--- Bind
'TextBox1.DataBindings.Add("Text", DS, "TEST.TESTFIELD1")
'TextBox2.DataBindings.Add("Text", DS, "TEST.TESTFIELD2")
DataGrid1.SetDataBinding(DS, "TEST")Catch ex As Exception
MessageBox.Show(ex.ToString, "エラーメッセージ")
Finally
If Not IsNothing(Conn) Then Conn.Close()
End Try
End Sub
'--- 削除ボタン Private Sub btnDELETE_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDELETE.Click Try Dim Pos As Integer 'リスト内のポジション Pos = BindingContext(DS, "TEST").Position BindingContext(DS, "TEST").RemoveAt(Pos)DA.DeleteCommand.Parameters("@Field1").Value = CType(TextBox1.Text, Integer)
DA.Update(DS, "TEST")Catch ex As Exception
MessageBox.Show(ex.ToString, "エラーメッセージ")
End Try
End Sub
'--- 挿入ボタン Private Sub btnINSERT_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnINSERT.Click Try Dim Row As DataRow = DS.Tables("TEST").NewRowRow(0) = CType(TextBox1.Text, Integer)
Row(1) = CType(TextBox2.Text, String)
DS.Tables("TEST").Rows.Add(Row)DA.InsertCommand.Parameters("@Field1").Value = CType(TextBox1.Text, Integer)
DA.InsertCommand.Parameters("@Field2").Value = CType(TextBox2.Text, String)
DA.Update(DS, "TEST")Catch ex As Exception
MessageBox.Show(ex.ToString, "エラーメッセージ")
End Try
End Sub
'--- 更新ボタン Private Sub btnUPDATE_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUPDATE.Click Try Dim Row As DataRow Dim RowCnt As IntegerRowCnt = 0
For Each Row In DS.Tables("TEST").Rows
If DS.Tables("TEST").Rows(RowCnt).Item(0) = CType(TextBox1.Text, Integer) Then
DS.Tables("TEST").Rows(RowCnt).Item(1) = CType(TextBox2.Text, String)
Exit For
End If
RowCnt = RowCnt + 1
NextDA.UpdateCommand.Parameters("@Field1").Value = CType(TextBox1.Text, Integer)
DA.UpdateCommand.Parameters("@Field2").Value = CType(TextBox2.Text, String)
DA.Update(DS, "TEST")Catch ex As Exception
MessageBox.Show(ex.ToString, "エラーメッセージ")
End Try
End Sub
2005 / 10 / 20