我在连接到MS Access DB 2007时遇到问题。代码:

private void btnSave_Click(object sender, EventArgs e)
    {
        OleDbConnection Conn = new OleDbConnection();

        try
        {
            string conn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source="+ Directory.GetCurrentDirectory() +"\\dvd_manager.accdb;Persist Security Info=False;";
            Conn.ConnectionString = conn;

            Conn.Open();

            int i = cbbLocatie.SelectedIndex + 65;
            char c = (char)i;

            string sql = "INSERT INTO DVD (titel, locatie)VALUES(@titel, @locatie)";
            OleDbCommand Com = new OleDbCommand();
            Com.CommandText = sql;
            Com.Connection = Conn;

            OleDbParameter Param = new OleDbParameter("@titel", txtTitle.Text);
            Com.Parameters.Add(Param);

            Param = new OleDbParameter("@locatie", c);
            Com.Parameters.Add(Param);

            Com.ExecuteNonQuery();
            Conn.Close();

            MessageBox.Show("Data is opgeslagen " + sql);
        }
        catch (Exception ex)
        {
            MessageBox.Show("Fout opgetreden: " + ex.Message);
        }
        finally
        {
            Conn.Close();
        }
    }

当我运行此代码时,出现消息框。这应该意味着我的数据已插入。但是,当我打开accdb文件时,没有数据插入。我究竟做错了什么?

n

编辑:
ExecuteNonQuery()的返回值为1(我编辑我的帖子,因为我无法添加任何评论,所以当我单击“添加评论”时,该框不会显示。)

编辑2:
我用Title和Location属性创建了一个类。代码:
私有(private)无效btnSave_Click(对象发送者,EventArgs e)
{
OleDbConnection Conn =新的OleDbConnection();
try
{
    string conn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source="+ Directory.GetCurrentDirectory() +"\\dvd_manager.accdb;Persist Security Info=False;";
    Conn.ConnectionString = conn;

    // Create object
    Medium M = new Medium();
    int i = cbbLocatie.SelectedIndex + 65;
    char c = (char)i;

    M.Location = c;
    M.Title = txtTitle.Text;

    Conn.Open();

    string sql = "INSERT INTO DVD (titel, locatie)VALUES(@titel, @locatie)";
    OleDbCommand Com = new OleDbCommand();
    Com.CommandText = sql;
    Com.Connection = Conn;

    OleDbParameter Param1 = new OleDbParameter("@titel", M.Title);
    Com.Parameters.Add(Param1);

    OleDbParameter Param2 = new OleDbParameter("@locatie", M.Location);
    Com.Parameters.Add(Param2);

    int ret = Com.ExecuteNonQuery();
    Conn.Close();

    MessageBox.Show("Data is opgeslagen " + ret);
}
catch (OleDbException ex)
{
    MessageBox.Show(ex.Message);
}
catch (Exception ex)
{
    MessageBox.Show("Fout opgetreden: " + ex.Message);
}
finally
{
    Conn.Close();
}

}

由于我仍然无法单击添加注释按钮,因此这是带有无名sql参数的新代码:
// some code
Conn.Open();

string sql = "INSERT INTO DVD (titel, locatie)VALUES(?, ?)";
OleDbCommand Com = new OleDbCommand();
Com.CommandText = sql;
Com.Connection = Conn;

OleDbParameter Param1 = new OleDbParameter("@p1", OleDbType.VarChar, 1);
Param1.Value = M.Title;
Com.Parameters.Add(Param1);

OleDbParameter Param2 = new OleDbParameter("@p2", OleDbType.VarChar, 255);
Param2.Value = M.Location;
Com.Parameters.Add(Param2);

int ret = Com.ExecuteNonQuery();
Conn.Close();
// morde code

最佳答案

ExecuteNonQuery将返回一个int,指示受影响的行数。我要做的第一件事是检查退货。 ExecuteNonQuery可以执行并且不影响任何行,而不会触发捕获。

关于C#如何连接到MS Access 2007,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/508345/

10-13 03:16