c# - Scope_Identity 有什么问题？

Question

我尝试了数百万种方法来使范围标识起作用。它只是返回 __Page ！！

Query = "INSERT INTO seekers(name,sname,lname,status,gender,dob,major,experince,email,password,phone,valid,city) values(@name,@sname,@lname,@status,@gender,@dob,@major,@exp,@email,@password,@phone,0,@city);SELECT SCOPE_IDENTITY();";

// setting up command definition
Command = new SqlCommand(Query, Connection);

// setting up command parameters
Command.Parameters.AddWithValue("email", txt_email.Text);
Command.Parameters.AddWithValue("gender", lst_gender.SelectedValue);
Command.Parameters.AddWithValue("status", lst_status.SelectedValue);
Command.Parameters.AddWithValue("phone", long.Parse("968" + txt_phone.Text));
Command.Parameters.AddWithValue("password", txt_password.Text);
Command.Parameters.AddWithValue("exp", lst_exp.SelectedValue);
Command.Parameters.AddWithValue("city", lst_exp.SelectedValue);
Command.Parameters.AddWithValue("major", lst_major.SelectedValue);
Command.Parameters.AddWithValue("name", txt_name.Text);
Command.Parameters.AddWithValue("sname", txt_sname.Text);
Command.Parameters.AddWithValue("lname", txt_lname.Text);
Command.Parameters.AddWithValue("dob", cld_birth.SelectedDate);

int ID = (int)Command.ExecuteScalar();

Answer 1

使用 set nocount off 并尝试

由于第一个执行语句是插入返回值是影响的记录数

Answer 2

SCOPE_IDENTITY will return a decimal, try:

int ID = (int) (decimal) Command.ExecuteScalar(); 

It's not very clear what you mean by:

It is just returns __Page !!

Presumably the posted code is throwing an exception, and that's resulting in some higher level code doing whatever it is you mean by "... returns __Page".

If you look at the exception details, you'll find more about what happened: which I suspect is an InvalidCastException because you're trying to cast the object returned by Command.ExecuteScalar (a boxed decimal) to an int.

Answer 3

试用参数如下...

Query = "INSERT INTO seekers(name,sname,lname,status,gender,dob,major,experince,email,password,phone,valid,city) values(@name,@sname,@lname,@status,@gender,@dob,@major,@exp,@email,@password,@phone,0,@city);SET @ID=SCOPE_IDENTITY();"

//Your Parameters..
SqlParameter ID=new SqlParameter();
ID.Name="@ID";
ID.Direction=ParameterDirection.Output;
Command.Parameters.Add(ID);
Command.ExecuteNonQuery();
int id=(int)ID.Value;

或 Tryb 转换输出如下...

 Query = "INSERT INTO seekers(name,sname,lname,status,gender,dob,major,experince,email,password,phone,valid,city) values(@name,@sname,@lname,@status,@gender,@dob,@major,@exp,@email,@password,@phone,0,@city);SELECT CAST(scope_identity() AS int);"

 int id= (Int32)Command.ExecuteScalar();