Question

我正在使用vs 2013，我正在使用服务基础数据库为我的基于Windows的应用程序我正在创建员工管理应用程序，同时插入数据它显示我已插入记录但数据正在数据库中更新，任何人都可以帮助我...

 void metroButton1_Click(object sender, EventArgs e)
    {
        try
        {
            for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
            {
                con = new SqlConnection(cs.DBcon);

                using (SqlCommand cmd = new SqlCommand("INSERT INTO tbl_employee VALUES(@Designation, @Date, @Employee_name,@Leave,@L_Reason,@Performance,@Payment,@Petrol,@Grand_Total)", con))
                {
                    cmd.Parameters.AddWithValue("@Designation", dataGridView1.Rows[i].Cells[0].Value);
                    cmd.Parameters.AddWithValue("@Date", dataGridView1.Rows[i].Cells[1].Value);
                    cmd.Parameters.AddWithValue("@Employee_name", dataGridView1.Rows[i].Cells[2].Value);
                    cmd.Parameters.AddWithValue("@Leave", dataGridView1.Rows[i].Cells[3].Value);
                    cmd.Parameters.AddWithValue("@L_Reason", dataGridView1.Rows[i].Cells[4].Value);
                    cmd.Parameters.AddWithValue("@Performance", dataGridView1.Rows[i].Cells[5].Value);
                    cmd.Parameters.AddWithValue("@Payment", dataGridView1.Rows[i].Cells[6].Value);
                    cmd.Parameters.AddWithValue("@Petrol", dataGridView1.Rows[i].Cells[7].Value);
                    cmd.Parameters.AddWithValue("@Grand_Total", dataGridView1.Rows[i].Cells[8].Value);

                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();
                }


            }
            MessageBox.Show("Records inserted.");
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

Answer 1

我建议在ExecuteNonQuery之前添加con.BeginTransaction（），在ExecuteNonQuery之后添加con.Commit（）。

Answer 2

您应该在创建命令实例之前打开连接，如下所示：

void metroButton1_Click(object sender, EventArgs e)
{
    try
    {
        con = new SqlConnection(cs.DBcon);

        con.Open(); //Open the connection

        for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
        {
            using (SqlCommand cmd = new SqlCommand("INSERT INTO tbl_employee VALUES(@Designation, @Date, @Employee_name,@Leave,@L_Reason,@Performance,@Payment,@Petrol,@Grand_Total)", con)) //Now create the command
            {
                cmd.Parameters.AddWithValue("@Designation", dataGridView1.Rows[i].Cells[0].Value);
                cmd.Parameters.AddWithValue("@Date", dataGridView1.Rows[i].Cells[1].Value);
                cmd.Parameters.AddWithValue("@Employee_name", dataGridView1.Rows[i].Cells[2].Value);
                cmd.Parameters.AddWithValue("@Leave", dataGridView1.Rows[i].Cells[3].Value);
                cmd.Parameters.AddWithValue("@L_Reason", dataGridView1.Rows[i].Cells[4].Value);
                cmd.Parameters.AddWithValue("@Performance", dataGridView1.Rows[i].Cells[5].Value);
                cmd.Parameters.AddWithValue("@Payment", dataGridView1.Rows[i].Cells[6].Value);
                cmd.Parameters.AddWithValue("@Petrol", dataGridView1.Rows[i].Cells[7].Value);
                cmd.Parameters.AddWithValue("@Grand_Total", dataGridView1.Rows[i].Cells[8].Value);

                cmd.ExecuteNonQuery();
            }
        }

        con.Close();
        MessageBox.Show("Records inserted.");
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

Answer 3

执行连接内的所有内容，如下所示

    void metroButton1_Click(object sender, EventArgs e)
        {
            try
            {
                for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
                {
                    using(SqlConnection connection = new SqlConnection(cs.DBcon))
                    {
                      connection.Open();
                      cmd.Parameters.AddWithValue("@Designation", dataGridView1.Rows[i].Cells[0].Value);
                      cmd.Parameters.AddWithValue("@Date", dataGridView1.Rows[i].Cells[1].Value);
                      cmd.Parameters.AddWithValue("@Employee_name", dataGridView1.Rows[i].Cells[2].Value);
                      cmd.Parameters.AddWithValue("@Leave", dataGridView1.Rows[i].Cells[3].Value);
                      cmd.Parameters.AddWithValue("@L_Reason", dataGridView1.Rows[i].Cells[4].Value);
                      cmd.Parameters.AddWithValue("@Performance", dataGridView1.Rows[i].Cells[5].Value);
                      cmd.Parameters.AddWithValue("@Payment", dataGridView1.Rows[i].Cells[6].Value);
                      cmd.Parameters.AddWithValue("@Petrol", dataGridView1.Rows[i].Cells[7].Value);
                      cmd.Parameters.AddWithValue("@Grand_Total", dataGridView1.Rows[i].Cells[8].Value);
                      cmd.ExecuteNonQuery();
                      connection.Close();
                  }


                }
                MessageBox.Show("Records inserted.");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

数据没有插入数据库c＃winform

3 个答案: