insert into table with select query.

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2.33/5 (3 votes)

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SQL-Server-2005

Hi,

I have a table named orders.While inserting to the orders table the order number and date will be inserted .Order number will be created using function createOrderNumber() which will give the next order number from order table(ie. max(order num + 1)).
But while two users inserting same time the select same order number is inserting because select statement executes first and order number is not unique. Any solution for that?
this is my query:

SQL

insert into orders (order_number,order_datetime) select dbo.createOrderNumber(@order_category_str),@order_datetime)

Posted 2-Aug-12 18:46pm

danilmanuel

Updated 2-Aug-12 18:53pm

Prasad_Kulkarni

v3

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Comments

Santhosh Kumar Jayaraman 3-Aug-12 0:54am

Is that column has primary ket constraint?

danilmanuel 3-Aug-12 1:06am

That column doesnt have any primary key constraint.

2 solutions

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Prasad_Kulkarni · Answer 1 · 2012-08-02T18:58:00

Solution 1

Refer:
Implementing Optimistic Concurrency[^]

Another good article on CP:
6 ways of doing locking in .NET (Pessimistic and optimistic)[^]

Here is one with some snaps:
Handling Concurrency Issues in .NET[^]

Posted 2-Aug-12 18:58pm

Prasad_Kulkarni

Updated 2-Aug-12 19:01pm

v3

Nilesh Patil Kolhapur · Answer 2 · 2012-08-02T19:56:00

Solution 4

Hi,

try this

SQL

INSERT INTO Orders (order_number,order_datetime)
values (exec ('select (isnull(max(order_number),0)+1) from Orders ),@order_datetime)

Best Luck

Posted 2-Aug-12 19:56pm

Nilesh Patil Kolhapur