質問編集履歴
5
修正
test
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NULLの
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NULLの処理
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test
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File without changes
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4
追記
test
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File without changes
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test
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@@ -36,6 +36,132 @@
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```
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Imports Microsoft.VisualBasic.ControlChars
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Imports System.Data.OleDb
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Public Class Form1
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48
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49
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Private Cn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source = C:\コピー.mdb")
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53
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Private SQLCm As OleDbCommand = Cn.CreateCommand
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Private Adapter As New OleDbDataAdapter(SQLCm)
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Private Table As New DataTable
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'Loadイベント
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Private Sub form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
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'自分で定義した列しかバインドしない
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DataGridView1.AutoGenerateColumns = False
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SQLCm.CommandText = "SELECT a, b, c, d, e, f, g, h, IDNo FROM tblL WHERE DELFLG <> TRUE"
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Dim cb As New System.Data.OleDb.OleDbCommandBuilder()
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Adapter.Fill(Table)
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'▼値の表示
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DataGridView1.DataSource = Table
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86
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End Sub
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92
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'削除
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Private Sub Button1_Click_1(sender As Object, e As EventArgs) Handles Button1.Click
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MessageBox.Show("選択したデータを削除してもよろしいですか", "加工ラベル印刷", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
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Dim i As Integer
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If Windows.Forms.DialogResult.Yes Then
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For i = DataGridView1.Rows.Count - 1 To 0 Step -1
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If DataGridView1("a", i).Value = True Then
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DataGridView1.Rows.RemoveAt(i)
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End If
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Next
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End If
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End Sub
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'全選択
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Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
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Dim i As Integer
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For i = 0 To DataGridView1.Rows.Count - 1
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DataGridView1("a", i).Value = True
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Next
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End Sub
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'全解除
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Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
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Dim i As Integer
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For i = 0 To DataGridView1.Rows.Count - 1
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DataGridView1("a", i).Value = False
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Next
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End Sub
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'閉じる
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Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
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3
訂正
test
CHANGED
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File without changes
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test
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@@ -8,9 +8,9 @@
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NULLに対して以下のような変換をしたい。
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数値型→NULL
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数値型→NULL
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文字型→String.Empty
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文字型→String.Empty(0文字列)
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チェックボックス→FALSE
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@@ -216,4 +216,6 @@
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というようにしたいと考えています。
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これが自分のやりたいことを詳しく説明できているかはちょっとわからないのですが、動作としては上記のようにしたいです。
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2
追記
test
CHANGED
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File without changes
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test
CHANGED
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@@ -203,3 +203,17 @@
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その際に、今後何か変更があってもすぐに対応ができるようにVB.NET上でNULLの置換処理をしたいと考えています。
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見え方としては
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数値がNULLの場合→ブランク
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文字列がNULLの場合→ブランク
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チェックボックスがNULLの場合→FALSE
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というようにしたいと考えています。
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これが自分のやりたいことを詳しく説明できているかはちょっとわからないのですが、動作としては上記のようにしたいです。
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1
追記
test
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File without changes
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test
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@@ -29,3 +29,177 @@
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よろしく願いします。
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###追記
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```
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'閉じる
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Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
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Close()
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End Sub
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Private Sub Form1_FormClosed(sender As Object, e As FormClosedEventArgs) Handles Me.FormClosed
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Dim SQLCm As OleDbCommand = Cn.CreateCommand
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Dim Table As DataTable = DirectCast(DataGridView1.DataSource, DataTable)
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For Each Row As DataRow In Table.Rows
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Dim SQL As String = ""
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'●SQL文の生成
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Select Case Row.RowState
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Case DataRowState.Added
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'▼追加されたレコード
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SQL = "INSERT INTO tblL ( "
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SQL &= "a" & ", "
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SQL &= "b" & ", "
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SQL &= "c" & ", "
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SQL &= "d" & ", "
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SQL &= "e" & ", "
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SQL &= "f" & ", "
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SQL &= "g" & ", "
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SQL &= "h" & ") "
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SQL &= "VALUES" & " ("
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SQL &= Row("a") & ","
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SQL &= "'" & Row("b") & "', "
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SQL &= "'" & Row("c") & "', "
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SQL &= "'" & Row("d") & "', "
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SQL &= "'" & Row("e") & "', "
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SQL &= "'" & Row("f") & "', "
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SQL &= "'" & Row("g") & "', "
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SQL &= Row("h")
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SQL &= ")"
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'▼削除されたレコード
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Case DataRowState.Deleted
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SQL = "DELETE FROM tblL WHERE "
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SQL &= " IDNo = " & Row("IDNo", DataRowVersion.Original)
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'▼更新されたレコード
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Case DataRowState.Modified
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SQL = "UPDATE tblL SET"
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SQL &= " a = " & Row("a") & ", "
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SQL &= "b = '" & Row("b") & "', "
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SQL &= "c = '" & Row("c") & "', "
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SQL &= "d = '" & Row("d") & "', "
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SQL &= "e = '" & Row("e") & "', "
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SQL &= "f = '" & Row("f") & "', "
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SQL &= "g = '" & Row("g") & "', "
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SQL &= "h = " & Row("h")
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SQL &= " WHERE "
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SQL &= "IDNo = " & Row("IDNo", DataRowVersion.Original)
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Case Else
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Continue For
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End Select
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'●更新実行
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SQLCm.CommandText = SQL
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Cn.Open()
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SQLCm.ExecuteNonQuery()
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Cn.Close()
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Next
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'▼後処理
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186
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Table.Dispose()
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Adapter.Dispose()
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SQLCm.Dispose()
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Cn.Dispose()
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194
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195
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```
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196
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197
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上記が作成コードです。
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198
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+
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199
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+
Form1のLoadイベントでMDBファイルの取込、展開をしています。
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200
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+
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201
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+
Buttonイベントなどももっと上に書いてあるのですが、最終的にClosedイベントが発生したらデータ反映がされるように想定しています。
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202
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203
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204
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205
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その際に、今後何か変更があってもすぐに対応ができるようにVB.NET上でNULLの置換処理をしたいと考えています。
|