如何在 ASP.Net (Visual Studio 2010) 中管理两个 sql 查询

Question

所以我想要做的是点击一个按钮。我希望一个 sql 查询将值插入“Return_Process”表，另一个 sql 查询从另一个表中的匹配贷款 ID 中删除数据，即“Loan_Process”。

这是我编写的代码，但它没有删除任何内容，它将值插入到返回过程中，但没有从贷款过程中删除它。

    //Global variable declaration
    string path;
    string sql;
    string sql2;
    //create a method for database connection
    public void connection()
    {
        //connection string
        path = @"Data Source=NATHAN-PC\SQLEXPRESS;Initial Catalog=ASP;Integrated Security=True";
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        {
            connection();

            SqlConnection con = new SqlConnection(path);
            con.Open();

            //try
            {
                sql = "INSERT INTO Return_Process (Return_ID, FIne, Actual_Returned_Date, Loan_ID) VALUES ('" + txtRID.Text + "','" + txtfine.Text + "','" + TextBox1.Text + "','" + txtLID.Text + "')";
                sql2 = "Delete FROM Loan_Process WHERE Loan_ID='"+txtLID+"'";
                SqlCommand cmd = new SqlCommand(sql, con);
                cmd.ExecuteNonQuery();
                //lblerrormsg.Visible = true;
                //lblerrormsg.Text = "Success";
                con.Close();
                //GridView1.DataBind();
            }

            //catch (SqlException)
            //{
            //    //lblerrormsg.Visible = true;
            //    //lblerrormsg.Text = "Invalid";
            //}


            con.Close();
            //GridView1.DataBind();

        }

    }
}

}

我的 ASP.net 很差，所以如果有人能告诉我如何同时执行这两个查询，将不胜感激。

Answer 1

做这样的事情：

//your code
sql = "INSERT INTO Return_Process (Return_ID, FIne, Actual_Returned_Date, Loan_ID)"
    + " VALUES (@rid, @fine, @retDate, @lid); " //note ; inside
    + "Delete FROM Loan_Process WHERE Loan_ID=@lid;";
var cmd = new SqlCommand(sql, con);
cmd.Parameters.Add("@rid", SqlDbType.Int).Value = Int.Parse(txtRID.Text);
//similar for 3 remaining parameters. Just set correct SqlDbType
con.Open();
cmd.ExecuteNonQuery();
con.Close();