c# - delete query on access database c#

Question

I am creating an application with MS Access as back-end. I am running delete query but it is not working Code:

conchek.ConnectionString = ConfigurationManager.ConnectionStrings["KedarnathDB"].ConnectionString;
conchek.Open();
OleDbCommand cmdc = new OleDbCommand("select * from ReceiptsTrns Where ID=@CallerName", conchek);
cmdc.Parameters.Add("@CallerName", OleDbType.Numeric).Value = txtRcptNo.Text.Trim();
OleDbDataReader rd = cmdc.ExecuteReader();

if (rd.HasRows)
{
 conchek.Close();
 con1.ConnectionString = ConfigurationManager.ConnectionStrings["KedarnathDB"].ConnectionString;
 con1.Open();
 OleDbCommand cmd = new OleDbCommand("DELETE from ReceiptsTrns Where ID=@RCName", con1);
 cmd.Parameters.Add("@RCName", OleDbType.Numeric).Value = txtRcptNo.Text.Trim();
 con1.Close();
 MessageBox.Show("Receipt deleted successfully");
}

else
{
 conchek.Close();
 MessageBox.Show("No receipt found with this number");
}

the code is running successfully but it is not reflecting the change when I see my MS Access database.

Answer 1

您在 cmd 上缺少Execute调用。您创建它然后关闭连接，数据库永远不会运行该语句。

Answer 2

con1.ConnectionString =   ConfigurationManager.ConnectionStrings["KedarnathDB"].ConnectionString;

con1.Open();

OleDbCommand cmd = new OleDbCommand("DELETE from ReceiptsTrns Where ID=@RCName", con1);
cmd.Parameters.Add("@RCName", OleDbType.Numeric).Value = txtRcptNo.Text.Trim();
**cmd.ExecuteNoQuery();**
con1.Close();

Answer 3

对于相同的问题，我按照以下步骤操作：

1）打开您的访问数据库，

2) 单击顶部功能区中的 windows 图标，

3）点击访问选项，

4）点击信任中心设置，

5) 当内容被阻止时，单击在所有应用程序中显示消息栏

6）关闭数据库并重新打开它，

Access 将向您显示警告“数据库中的某些内容已被禁用”

7）点击选项，

8) 单击启用此内容。

您的数据库已准备好被操作...