运行多个 sql 命令

Question

我在执行多个 sql 命令时遇到问题。我需要多次更新数据。第一个 sql 查询关于这两种情况 if,else;但是第二个和第三个 sql 命令将相应地出现在 if 或 else 中。问题是只有一个 sql 命令可以正常工作，那些位于循环内的命令。

public void Button_Submit_Onclick(object sender, EventArgs e)
    {

        for (int i = 0; i < GridView2.Rows.Count; i++)
        {
            con.ConnectionString = ConfigurationManager.ConnectionStrings["TestDeductionsConnectionString2"].ToString();
            int recordid = Convert.ToInt32(GridView2.DataKeys[i].Values[0]);

            CheckBox cbox = (CheckBox)GridView2.Rows[i].FindControl("CheckBox1");
            bool private1 = Convert.ToBoolean(cbox.Checked); 

            SqlCommand cmd = new SqlCommand();
            cmd.Connection = con;
            cmd.CommandText = "Update DetailCosts set private='" + private1 + "' where recordid=" + recordid;

            con.Open();
            if (private1==true)
            {
                cmd.CommandText = "Update DetailCosts set privateCost=Costs where recordid=" + recordid;
                cmd.Parameters.AddWithValue("@private1", SqlDbType.Bit).Value = private1;
                cmd.Parameters.AddWithValue("@recordid", SqlDbType.Int).Value = recordid.ToString();

            }
            else
            {
                cmd.CommandText = "Update DetailCosts set privateCost=0 where recordid=" + recordid;
                cmd.Parameters.AddWithValue("@recordid", SqlDbType.Int).Value = recordid.ToString();
                cmd.Parameters.Add("@private1", SqlDbType.Bit).Value = private1;

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


    }

Answer 1

您需要执行每条要执行的命令，因此您应该添加一个

cmd.ExecuteNonQuery();

在您的第一个查询之后也执行它。

如果您希望两者都被执行，而不是在一个失败时执行，您应该实施 transactions 并将两个查询包装在一个事务中。

Answer 2

这是一个工作代码：

public void Button_Submit_Onclick(object sender, EventArgs e)
    {

        for (int i = 0; i < GridView2.Rows.Count; i++)
        {
            con.ConnectionString = ConfigurationManager.ConnectionStrings["TestDeductionsConnectionString2"].ToString();
            int recordid = Convert.ToInt32(GridView2.DataKeys[i].Values[0]);
            //bool private1 = Convert.ToBoolean(GridView2.FindControl("CheckBox1"));
            CheckBox cbox = (CheckBox)GridView2.Rows[i].FindControl("CheckBox1");
            bool private1 = Convert.ToBoolean(cbox.Checked); 

            SqlCommand cmd = new SqlCommand();
            cmd.Connection = con;
            con.Open();
            cmd.CommandText = "Update DetailCosts set private='" + private1 + "' where recordid=" + recordid;

            cmd.Parameters.AddWithValue("@private1", SqlDbType.Bit).Value = private1;
            cmd.Parameters.AddWithValue("@recordid", SqlDbType.Int).Value = recordid.ToString();
            cmd.ExecuteNonQuery();

            if (private1==true)
            {
                //DateTime date = DateTime.Now;
                //cmd.CommandText = "Update AprovedCosts set AprovedCosts.AprovalUser = ";

                cmd.CommandText = "Update DetailCosts set privateCost=Costs where recordid=" + recordid;
                cmd.ExecuteNonQuery();
            }
            else
            {

                cmd.CommandText = "Update DetailCosts set privateCost=0 where recordid=" + recordid;
                cmd.ExecuteNonQuery();
            }
            con.Close();
        }

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