Question

sql has a Table called emp.

emp(emp_id int IDENTITY primary key, EmployeeName varchar(50),.......)

I want to Insert a record to above table. Here is my code in asp.net.

DBconnection dbcon = new DBconnection();
string query = "insert into emp values('" + TextBox_EmpName.Text + "','" + ....);
int no1 = dbcon.insertQuery(query);

I have another table called emp-relation

 emp-relation(emp_id int primary key, count int, ....) 
     -- foreign key (emp_id)references emp(emp_id)

My problem is when I inserting the emp row ,I dont know what is the emp_id since it created by auto. And when I am going to insert to emp-relation , I want to get emp-id since it is the foreign key.

How can I do this? Is there any way to read last Insert row in Sql according to Time stamp or some thing? I believe that records are not sorted according to inserted timestamp in nature. please help me.

Answer 1

There’s bascally two ways. The first way is to return the new ID from the first insert query:

insert into emp values(...)
select scope_identity() as NewID

The second way is to lookup the first row when you insert into the relation table:

insert  emp-relation
        (emp_idm, ...) 
select  emp_id
,       ...
from    emp
where   emp_name = @EmpName

You have to pass in enough columns to make the reference unique.