【发布时间】：2017-05-12 11:31:54
【问题描述】：
请帮助我。我在创建的支票打印系统中添加了一个删除方法，在它运行良好之前，但是当我从各自的表中将字段 Check_Number 的数据类型从 text 更改为 number 时，它是不再删除我选择的数据行。我不记得从删除部分更改任何代码。你们知道如何解决这个问题吗？先感谢您。更强大！
不同的 Bank_[BankName] 有 ff 字段和数据类型：
ID - AutoNumber
Check_Number - Number
Company_ID - Text
我的VN_ZAM 表有 ff 字段和数据类型：
ID - AutoNumber
Voucher_Number - Number
Check_Number - Text
Bank_Type - Text
Company_ID - Text
我的SS 表有 ff 字段和数据类型（这也是数据网格视图中数据的来源）：
ID - AutoNumber
Check_No - Text
Voucher_No - Text
Issue_Date - Date/Time
Company_Name - Text
Bank_Type - Text
Amount_in_Figure - Number
Amount_in_Words - Text
Payee - Text
我的 datagridview 订单如下所示：
ID | Check_No | Voucher_No | Issue_Date | Company_Name |Bank_Type | Amount_in_Figure | Amount_in_Words | Payee
.
Private Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click
Dim provider As String
Dim dataFile As String
Dim connString As String
Dim myConnection As OleDbConnection = New OleDbConnection
Dim sql As String
Dim sql1 As String
Dim sql2 As String
Dim answer As Integer
answer = MsgBox("Are you sure you want to delete this record?", vbYesNo + vbDefaultButton1, "Information")
'If answer = vbYes Then
provider = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source ="
dataFile = "C:\Users\Pc\Documents\Visual Studio 2010\Projects\bankCheckSystem\dbcheckprintsystem.accdb"
connString = provider & dataFile
myConnection.ConnectionString = connString
myConnection.Open()
sql = "DELETE * FROM SS WHERE ID =" & dgvSSCheckRecords.SelectedRows(0).Cells(0).Value.ToString()
If dgvSSCheckRecords.SelectedRows(0).Cells(12).Value.ToString() = "ZAM" Then
sql1 = "DELETE * FROM VN_ZAM WHERE Company_ID = '" & dgvSSCheckRecords.SelectedRows(0).Cells(4).Value.ToString() & "_" & dgvSSCheckRecords.SelectedRows(0).Cells(0).Value.ToString() & "' "
Dim cmd As OleDbCommand = New OleDbCommand(sql, myConnection)
Dim cmd1 As OleDbCommand = New OleDbCommand(sql1, myConnection)
'cmd.ExecuteNonQuery()
'cmd1.ExecuteNonQuery()
If dgvSSCheckRecords.SelectedRows(0).Cells(5).Value.ToString() = "BDO" Then
sql2 = "DELETE * FROM Bank_BDO WHERE Company_ID = '" & dgvSSCheckRecords.SelectedRows(0).Cells(4).Value.ToString() & "_" & dgvSSCheckRecords.SelectedRows(0).Cells(0).Value.ToString() & "' AND Check_Number ='" & dgvSSCheckRecords.SelectedRows(0).Cells(1).Value.ToString() & "'"
Dim cmd2 As OleDbCommand = New OleDbCommand(sql2, myConnection)
cmd.ExecuteNonQuery()
cmd1.ExecuteNonQuery()
cmd2.ExecuteNonQuery()
ElseIf dgvSSCheckRecords.SelectedRows(0).Cells(5).Value.ToString() = "BPI" Then
sql2 = "DELETE * FROM Bank_BPI WHERE Company_ID = '" & dgvSSCheckRecords.SelectedRows(0).Cells(4).Value.ToString() & "_" & dgvSSCheckRecords.SelectedRows(0).Cells(0).Value.ToString() & "' AND Check_Number ='" & dgvSSCheckRecords.SelectedRows(0).Cells(1).Value.ToString() & "'"
Dim cmd2 As OleDbCommand = New OleDbCommand(sql2, myConnection)
cmd.ExecuteNonQuery()
cmd1.ExecuteNonQuery()
cmd2.ExecuteNonQuery()
End if
End Sub
【问题讨论】：
-
我不熟悉“删除 *”语法。你能提供一个参考吗？
-
我不确定你不熟悉“删除”语法是什么意思，但这是我用来从数据库中永久删除记录的查询。 tutorialspoint.com/mysql/mysql-delete-query.htm 谢谢。 @草莓
-
那是
"DELETE"，不是"DELETE *"
标签： mysql sql visual-studio visual-studio-2010 datagridview