Question

我使用的是T-SQL，这是我可以阅读的存储过程之一，具体取决于我的参数（@para_type）是Employee还是Consultant ，以下语句将执行，触发器将被触发。存储过程在SQL Server Management Studio（SSMS）中执行时正在运行。

我输入以下内容：

 execute update_person @para_salary = 800, @para_ssn = 17,
                       @para_companyName = 'Ikea',@para_expdate = '20201230',
                       @para_type = 'Consultant', @para_officeId = 2

但是在我的C＃Winforms代码中，我使用文本框来填充T-SQL（@para_type）的参数。它不会影响我的存储过程的IF语句。我已经在C＃中对它进行了调试，所有内容都相应地执行了，但是我的存储过程不会执行编程。

存储过程：

create procedure update_person
    @para_salary varchar(25),
    @para_ssn int,
    @para_companyName varchar(25),
    @para_expdate date,
    @para_type varchar(10),
    @para_officeId int
as 
begin
    if @para_ssn is null
        print('Please enter a value for (ssn)')
   else if @para_type = 'Employee'
        delete from consultant 
        where ssn = @para_ssn        

   update person 
   set flag = @para_type
   where ssn = @para_ssn

   update employee
   set salary = @para_salary
   where ssn = @para_ssn     

   if @para_type = 'Consultant'
        delete from employee 
        where ssn = @para_ssn           

   update person 
   set flag = @para_type
   where ssn = @para_ssn

   update consultant
   set companyName = @para_companyName, expdate = @para_expdate
   where ssn = @para_ssn 

   update works_at
   set officeId = @para_officeId
   where ssn = @para_ssn
end

C＃Winform the view：

public void initializeComboBoxes()
{ 
     var arr1 = new string[] { "Employee", "Consultant" };

     foreach (var item in arr1)
         add_person_combobox.Items.Add(item);

     add_person_combobox.SelectedIndex = 0;

     foreach (var item in arr1)
         update_person_combobox.Items.Add(item);

     update_person_combobox.SelectedIndex = 0;
}

private void lblTimer(int i)
{
    var t = new Timer();

    t.Interval = i;

    t.Tick += (s, e) =>
        {
            ResponseLbl.Text = "";
            t.Stop();
        };

    t.Start();
}

private void update_person_btn_Click(object sender, EventArgs e)
{
    if (string.IsNullOrWhiteSpace(update_person_salary.Text))
    {
        update_person_salary.Text = "0";
    }

    if (string.IsNullOrWhiteSpace(update_person_CoName.Text))
    {
        update_person_CoName.Text = "Lund Consulting AB";
    }

    int ssn = Convert.ToInt32(update_person_ssn.Text);            
    string type = update_person_combobox.SelectedItem.ToString();
    int salary = Convert.ToInt32(update_person_salary.Text);
    string comName = update_person_CoName.Text;

    int officeId = update_person_officeId.SelectedIndex + 1;
    DateTime expdate = update_person_expDate.Value.Date;

    if (ctrl.update_person(salary, ssn, comName, expdate, type, officeId) == true)              
    {                     
        ResponseLbl.ForeColor = System.Drawing.Color.Green;
        ResponseLbl.Text = "Succesfull";
        lblTimer(3000);               
    }
    else
    {
        ResponseLbl.ForeColor = System.Drawing.Color.Red;
        ResponseLbl.Text = "Failed";
        lblTimer(3000);
    }
}

C＃数据访问层

public bool update_person(int ssn, int salary, string companyName, DateTime expdate, string type, int officeId)
{
    try
    {
        con.Open();

        cmd = new SqlCommand("update_person", con);
        cmd.CommandType = System.Data.CommandType.StoredProcedure;            

        cmd.Parameters.AddWithValue("@para_ssn", ssn);
        cmd.Parameters.AddWithValue("@para_salary", salary);
        cmd.Parameters.AddWithValue("@para_companyName", companyName);
        cmd.Parameters.AddWithValue("@para_expdate", expdate);
        cmd.Parameters.AddWithValue("@para_type", type);
        cmd.Parameters.AddWithValue("@para_officeId", officeId);

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

        return true;
    }
    catch (SqlException e)
    {
        Console.WriteLine("error: " + e.Message);
        con.Close();
        return false;
    }                      
}

Answer 1

你在程序块中缺少BEGIN和END ..

BEGIN
 if @para_ssn is null
    print('Please enter a value for (ssn)')
else if @para_type = 'Employee'
    BEGIN
      delete from consultant where ssn = @para_ssn        

      update person set flag = @para_type where ssn = @para_ssn
      update employee set salary = @para_salary where ssn = @para_ssn     
     END
else if @para_type = 'Consultant'
    BEGIN
      delete from employee where ssn = @para_ssn           
      update person set flag = @para_type where ssn = @para_ssn
      update consultant set companyName = @para_companyName, expdate = @para_expdate where ssn = @para_ssn 
      update works_at set officeId = @para_officeId where ssn = @para_ssn
    END
END

为什么我的C＃字符串不会影响我的存储过程IF语句？

1 个答案: