下面是我用于 MySqlTransaction 的代码,它运行完美......
但问题是,因为我使用的是 mysqlcommand 的单个实例,所以我必须在其中使用唯一的参数。这毁了我的查询。有没有其他办法可以做......
我尝试在每次查询后处理 cmd 但没有用..:(
con.Open()
Dim sqlTran As MySqlTransaction = con.BeginTransaction()
Dim cmd As MySqlCommand = con.CreateCommand()
cmd.Transaction = sqlTran
Dim str As String = Nothing
Try
cmd.CommandText = "SELECT myid FROM memaster where Adate=@adate and ANo=@ano and ASource=@asrc"
cmd.Parameters.AddWithValue("@adate", txt_bpass_adate.Text)
cmd.Parameters.AddWithValue("@ano", txt_bpass_af.Text)
cmd.Parameters.AddWithValue("@asrc", txt_bpass_asource.Text)
str = cmd.ExecuteScalar()
'cmd.Dispose()'
If str Is Nothing Then
cmd.CommandText = "Insert into memaster (ADate,ANo,ASource) values (@aDate,@aNo,@aSRC)"
cmd.Parameters.AddWithValue("@aDate", txt_bpass_adate.Text)
cmd.Parameters.AddWithValue("@aNo", txt_bpass_af.Text)
cmd.Parameters.AddWithValue("@aSRC", txt_bpass_asource.Text)
cmd.ExecuteNonQuery()
End If
sqlTran.Commit()
Catch ex As Exception
Try
sqlTran.Rollback()
Catch ex1 As Exception
End Try
End Try
我实际上想在单个事务中触发超过 4 个查询,这样如果出现任何问题我可以回滚它......
如果有人有任何其他方法,请与我分享这个概念......
For index As Integer = 1 To 5
cmd.CommandText = "Insert into detail (ID,BNos,SNo) values (@FID1,@BNo,@SeqN1)"
cmd.Parameters.AddWithValue("@FID1", str)
cmd.Parameters.AddWithValue("@BNo", str1)
cmd.Parameters.AddWithValue("@SeqN1", txt_bpass_sqn1.Text)
cmd.ExecuteNonQuery()
Next