i am working with HSQL database for testing purpose. i want standalone db file.
but now i am in trouble to get last inserted row id (auto-incremental - identity) in HSQL. how can i get id??
http://www.hsqldb.org/doc/guide/ch09.html
the last inserted value into an identity column for a connection is
available using the function IDENTITY(), for example (where Id is
the identity column):
INSERT INTO Test (Id, Name) VALUES (NULL,'Test');
CALL IDENTITY();
It's pretty hard to write a query to perform this when you haven't given your table schema, but something like the following:
SELECT TOP 1 Id FROM [TABLENAME] ORDER BY Id DESC
Related
I'm trying to get the last id inserted into a table.
I was using
SELECT IDENT_CURRENT('TABLE')
But the problem is that it doesn't return the last inserted id, it returns the max inserted id.
For example, if i do:
INSERT INTO 'TABLA' (ID) VALUES (100)
SELECT IDENT_CURRENT('TABLE') returns 100
but then if i do
INSERT INTO 'TABLA' (ID) VALUES (50)
SELECT IDENT_CURRENT('TABLE') returns 100
and I want to get 50
I need the ID of a specific table, and I generate the id dinamically, so it's not an identity
How can i do it?
From your code, it looks like ID is not an identity (auto-increment) column, so IDENT_CURRENT isn't going to do what you are expecting.
If you want to find the last row inserted, you will need a datetime column that represents the insert time, and then you can do something like:
SELECT TOP 1 [ID] FROM TABLEA ORDER BY [InsertedDate] DESC
Edited: a few additional notes:
Your InsertedDate column should have a default set to GetDate() unless your application, stored procs or whatever you use to perform inserts will be responsible for setting the value
The reason I said your ID is not an identity/auto-increment is because you are inserting a value into it. This is only possible if you turn identity insert off.
SQL Server does not keep track of the last value inserted into an IDENTITY column, particularly when you use SET IDENTITY_INSERT ON;. But if you are manually specifying the value you are inserting, you don't need SQL Server to tell you what it is. You already know what it is, because you just specified it explicitly in the INSERT statement.
If you can't get your code to keep track of the value it just inserted, and can't change the table to have a DateInserted column with a default of CURRENT_TIMESTAMP (which would allow you to see which row was inserted last), perhaps you could add a trigger to the table that logs all inserts.
SELECT SCOPE_IDENTITY()
will return the last value inserted in current session.
Edit
Then what you are doing is the best way to go just make sure that the ID Column is an IDENTITY Column, IDENT_CURRENT('Table_name'), ##IDENTITY and SCOPE_IDENTITY() returns last value generated by the Identity column.
If the ID column is not an Identity Column, all of these functions will return NULL.
I have this table:
Table1:
id text
1 lala
And i want take first row and copy it, but the id 1 change to 2.
Can you help me with this problem?
A SQL table has no concept of "first" row. You can however select a row based on its characteristics. So, the following would work:
insert into Table1(id, text)
select 2, text
from Table1
where id = 1;
As another note, when creating the table, you can have the id column be auto-incremented. The syntax varies from database to database. If id were auto-incremented, then you could just do:
insert into Table1(text)
select text
from Table1
where id = 1;
And you would be confident that the new row would have a unique id.
Kate - Gordon's answer is technically correct. However, I would like to know more about why you want to do this.
If you're intent is to have the field increment with the insertion of each new row, manually setting the id column value isn't a great idea - it becomes very easy for there to be a conflict with two rows attempting to use the same id at the same time.
I would recommend using an IDENTITY field for this (MS SQL Server -- use an AUTO_INCREMENT field in MySQL). You could then do the insert as follows:
INSERT INTO Table1 (text)
SELECT text
FROM Table1
WHERE id = 1
SQL Server would automatically assign a new, unique value to the id field.
How do I retrieve the ID of an inserted row in SQL?
Users Table:
Column | Type
--------|--------------------------------
ID | * Auto-incrementing primary key
Name |
Age |
Query Sample:
insert into users (Name, Age) values ('charuka',12)
In MySQL:
SELECT LAST_INSERT_ID();
In SQL Server:
SELECT SCOPE_IDENTITY();
In Oracle:
SELECT SEQNAME.CURRVAL FROM DUAL;
In PostgreSQL:
SELECT lastval();
(edited: lastval is any, currval requires a named sequence)
Note: lastval() returns the latest sequence value assigned by your session, independently of what is happening in other sessions.
In SQL Server, you can do (in addition to the other solutions already present):
INSERT INTO dbo.Users(Name, Age)
OUTPUT INSERTED.ID AS 'New User ID'
VALUES('charuka', 12)
The OUTPUT clause is very handy when doing inserts, updates, deletes, and you can return any of the columns - not just the auto-incremented ID column.
Read more about the OUTPUT clause in the SQL Server Books Online.
In Oracle and PostgreSQL you can do this:
INSERT INTO some_table (name, age)
VALUES
('charuka', 12)
RETURNING ID
When doing this through JDBC you can also do that in a cross-DBMS manner (without the need for RETURNING) by calling getGeneratedKeys() after running the INSERT
I had the same need and found this answer ..
This creates a record in the company table (comp), it the grabs the auto ID created on the company table and drops that into a Staff table (staff) so the 2 tables can be linked, MANY staff to ONE company. It works on my SQL 2008 DB, should work on SQL 2005 and above.
===========================
CREATE PROCEDURE [dbo].[InsertNewCompanyAndStaffDetails]
#comp_name varchar(55) = 'Big Company',
#comp_regno nchar(8) = '12345678',
#comp_email nvarchar(50) = 'no1#home.com',
#recID INT OUTPUT
-- The '#recID' is used to hold the Company auto generated ID number that we are about to grab
AS
Begin
SET NOCOUNT ON
DECLARE #tableVar TABLE (tempID INT)
-- The line above is used to create a tempory table to hold the auto generated ID number for later use. It has only one field 'tempID' and its type INT is the same as the '#recID'.
INSERT INTO comp(comp_name, comp_regno, comp_email)
OUTPUT inserted.comp_id INTO #tableVar
-- The 'OUTPUT inserted.' line above is used to grab data out of any field in the record it is creating right now. This data we want is the ID autonumber. So make sure it says the correct field name for your table, mine is 'comp_id'. This is then dropped into the tempory table we created earlier.
VALUES (#comp_name, #comp_regno, #comp_email)
SET #recID = (SELECT tempID FROM #tableVar)
-- The line above is used to search the tempory table we created earlier where the ID we need is saved. Since there is only one record in this tempory table, and only one field, it will only select the ID number you need and drop it into '#recID'. '#recID' now has the ID number you want and you can use it how you want like i have used it below.
INSERT INTO staff(Staff_comp_id)
VALUES (#recID)
End
-- So there you go. I was looking for something like this for ages, with this detailed break down, I hope this helps.
How can I get the ##IDENTITY for a specific table?
I have been doing
select * from myTable
as I assume this sets the scope, from the same window SQL query window in SSMS I then run
select ##IDENTITY as identt
It returns identt as null which is not expected since myTable has many entrie in it already..
I expect it to return the next available ID integer.
myTable has a ID column set to Primary key and auto increment.
You can use IDENT_CURRENT
IDENT_CURRENT( 'table_name' )
Note that IDENT_CURRENT returns the last identity value for the table in any session and any scope. This means, that if another identity value was inserted after your identity value then you will not retrieve the identity value that you inserted.
You can only truly use SELECT ##IDENTITY after an insert - the last insert into a table that has an IDENTITY column is the value you'll get back.
You cannot "limit" it to a table - the value in ##IDENTITY - and by the way, I'd strongly recommend using SCOPE_IDENTITY() instead!! - is the last value on any IDENTITY column that was set.
The problem with ##IDENTITY is that it will report back the last IDENTITY value inserted into any table - if your INSERT into your data table will cause e.g. a trigger to write an entry into an Audit table and that Audit table has an IDENTITY field, you'll get back that IDENTITY value - not the one inserted into your table. SCOPE_IDENTITY() solves that.
IDENT_CURRENT does what you want. But don't.
This is in addition to marc_s' answer
I've never known ##IDENTITY to be used this way, i've only ever used it to access the ID of a newly inserted record.
That's correct. ##IDENTITY cannot be used the way you think it can be. It can only be used after an INSERT into a table. Let's consider this for a scenario:
You have two tables: Order (Primary Key: OrderID), OrderDetails (Foreign Key: OrderID)
You perform
INSERT INTO Order
VALUES('Pillows')
-- Note that OrderId is not mentioned in Values since it is auto number (primary key)
Now you want to perform insert into OrderDetail. But you don't always remember how many records there were in Order table prior to you having inserted the record for 'Pillows' and hence you don't remember what was the last PrimaryKey inserted into Order table. You could but even then you wouldn't want to specifically mention to insert (let's say OrderID of 1) when you insert into OrderDetail table.
Hence, your OderDetail insert would work kinda like so:
INSERT INTO OrderDetail
VALUES (##IDENTITY,'Soft Pillows')
Hope this explains the user of ##IDENTITY.
I'm using SQL Server 2005 with a table with a primary key field with the type varchar(40). I have to get the last inserted record's primary key value. I have tried scope_identity but it is not working. How can I get this?
I found the result.
Code:
insert into T
output inserted.pk
values ('new item');
If your ID is a varchar I suppose it's not auto generated so you should know it before you insert a record . BTW can't you just select your id after you insert a record?
Something like this:
CREATE PROC InsertXXX( ... value parameters...)
AS
BEGIN
INSERT .....
SELECT ID FROM MyTable
END
UPDATED :
If you want to know the last inserted record and its ID before inserting a new record it can be a little bit harder depending on ID values.
If you can find the last record by sorting ID column you can do it as follows:
SELECT Max(ID) FROM myTable
If not you can have a DateTime filed (CreationDate for example) that holds the time of insertion of the record.Then you can do as follows:
SELECT ID FROM MyTable WHERE CreationDate=(SELECT Max(CreationDate) FROM MyTable)