How to get last value inserted in a database to generate new one

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Using Text Area I'm sending Values to database by clicking button, but I want postID to auto generate how I can do it?

protected void btnPost_Click(object sender, EventArgs e)
{
    string PostQuery = "INSERT INTO [Post] (PostID,PostDet,Votes,UserID) VALUES('<auto Genatare post ID>','" + TxtPost.Text + "','12','Us001')";
    dbClass.ConnectDataBaseToInsert(PostQuery);
    Response.Redirect("~/computing.aspx");
}

You could make PostID a UNIQUEIDENTIFIER column and then pass in a newly generated GUID (Guid.NewGuid()).

Also, please use parameterized queries to avoid SQL injection. Especially if the inputs come directly from WEB users.

To do so, change your ConnectDataBaseToInsert method to not take SQL text, but an SqlCommand which you prepare with the respective parameters.


From your comment to the question: The PostID should be like PO0001. Then the only way to do it properly and to respect for concurrency is to generate a stored procedure that takes the value to insert, which generates the ID itself.

To do so, create a new table that contains the last post ID. Then, use an UPDATE ... OUTPUT statement to increment and return in one go. This is the only way to do an atomic update of the post ID so that no two users create the same ID.

Example Table PostIDTable

Current
=======
0

Example SELECT to update and retrieve the current post ID:

-- We need a temp table, because OUTPUT can not output into a single variable
-- This increments Current by one and outputs the value that was set in one go.
-- This prevents simultaneous calls to get the same ID
DECLARE #postID (ID INT)
UPDATE PostIDTable
OUPUT INSERTED.Current INTO #postID
SET
    Current = Current + 1

-- Get the value from the temp table and convert it into the desired format
DECLARE @pID INT = (SELECT TOP 1 ID FROM #postID)
DECLARE @id NVARCHAR(6) = 'PO' + RIGHT('0000' + CONVERT(NVARCHAR, @pID), 4)

-- Do the actual INSERT
INSERT INTO (PostDet, Votes,UserID) VALUES (@id, ..., ...)

Best way to get last identity inserted in a table, Use SCOPE_IDENTITY() if you are inserting a single row and want to retrieve the ID that was generated. CREATE TABLE #a(identity_column  Then the only way to do it properly and to respect for concurrency is to generate a stored procedure that takes the value to insert, which generates the ID itself. To do so, create a new table that contains the last post ID. Then, use an UPDATE OUTPUT statement to increment and return in one go. This is the only way to do an atomic update of the post ID so that no two users create the same ID.

You should make the PostID column to be an IDENTITY(1,1) column (in case of using MSSQL. server). So when you will insert new rows to your database the corresponding PostID values will be autogenerated by your database. The same holds for each other RDBMS you may use.

Having done the above change you code will change to the following:

protected void btnPost_Click(object sender, EventArgs e)
{
    string PostQuery = "INSERT INTO [Post] (PostDet,Votes,UserID) VALUES("TxtPost.Text + "','12','Us001')";
    dbClass.ConnectDataBaseToInsert(PostQuery);
    Response.Redirect("~/computing.aspx");
}

MySQL LAST_INSERT_ID Function By Practical Examples, In database design, we often use a surrogate key to generate unique integer values A) Using MySQL LAST_INSERT_ID() function to get value when inserting one row into a table Second, insert a new row into the messages table. Finally, use the LAST_INSERT_ID function to get the last automatically inserted value:. Now, just use the SQLite last_insert_rowid() function to get the value of the SQLite autoincrement field that was just generated: sqlite> select last_insert_rowid(); 2 In this case the result was 2 , because this was the second record I’ve inserted into this table.

If PostId is autogenerated, only do this:

protected void btnPost_Click(object sender, EventArgs e)
{
    string PostQuery = "INSERT INTO [Post] (PostDet,Votes,UserID) VALUES('" + TxtPost.Text + "','12','Us001')";
    dbClass.ConnectDataBaseToInsert(PostQuery);
    Response.Redirect("~/computing.aspx");
}

Removing PostId from your query, it will generate the next Id

Access last inserted row in MySQL?, This method gets the ID of the last inserted record in MySQL. MySQLMySQLi Database To understand the above syntax, let us create a table. LastInsertedRow(UserName,UserAge) values('John',23); Query OK, 1 row affected (0.19 sec) mysql> insert Here is the query to get the last inserted row If you have a trigger on a table that causes an identity to be created in another table, you will get the identity that was created last, even if it was the trigger that created it. SELECT SCOPE_IDENTITY() It returns the last IDENTITY value produced on a connection and by a statement in the same scope, regardless of the table that produced the value. SCOPE_IDENTITY(), like @@IDENTITY, will return the last identity value created in the current session, but it will also limit it to your

the best way is to use auto increment column ID for your table. Please, see w3school tutorial where is described construction for all main db.

28.7.28.3 How to Get the Unique ID for the Last Inserted Row, When a new AUTO_INCREMENT value has been generated, you can also obtain If you want to use the ID that was generated for one table and insert it into a  When we execute this stored procedure, after inserting the record, it returns the PersonalDetialsId value of last inserted record. Now running the modified stored procedure gives a return value like below. Important. SCOPE_IDENTITY() method only returns the Identity (auto increment) column value.

Try this..

select * from tablename order by id desc limit 1

where id would be your primary key attribute name.

LAST_INSERT_ID, Last inserted auto_increment value. generated value successfully inserted for an AUTO_INCREMENT column as a result of If one gives an argument to LAST_INSERT_ID(), then it will return the value of the If a stored procedure executes statements that change the value of LAST_INSERT_ID(), the new value will be  Here Mudassar Ahmed Khan has explained with example, how to get the Inserted, Updated and Deleted Row column values such as ID field in Insert, Update and Delete SQL Server Triggers. This tutorial is applicable for all versions of SQL Server i.e. 2005, 2008, 2012, 2014, etc. TAGs: SQL Server

PHP MySQL Get Last Inserted ID, MySQL Database Get ID of The Last Inserted Record CREATE TABLE MyGuests ( previous page (PHP Insert Data Into MySQL), except that we have added one VALUES ('John', 'Doe', 'john@example.com')"; if ($conn->query($​sql) === TRUE) { $last_id = $conn->insert_id; echo "New record created successfully. The above code is filled with comments and is pretty self explanatory. Finally we have last inserted value in studentId variable. The getGeneratedKeys() method is key here. It gives us the result set of all auto generated key values. In our case as we have only one auto generated value (for student_id column) we get only single record in this

mysql_insert_id - Manual, mysql_insert_id — Get the ID generated in the last query If no such link is found, it will try to create one as if mysql_connect() had been called with insert a new item into the database $demande = "insert into categories_disc values (''​, '". B. Using FIRST_VALUE and LAST_VALUE in a computed expression. The following example uses the FIRST_VALUE and LAST_VALUE functions in computed expressions to show the difference between the sales quota value for the current quarter and the first and last quarter of the year respectively for a given number of employees.

SCOPE_IDENTITY (Transact-SQL), USE tempdb; GO CREATE TABLE TZ ( Z_id int IDENTITY(1,1)PRIMARY KEY, Z_name varchar(20) NOT NULL); INSERT TZ VALUES ('Lisa'),('  Get ID of The Last Inserted Record. If we perform an INSERT or UPDATE on a table with an AUTO_INCREMENT field, we can get the ID of the last inserted/updated record immediately. In the table "MyGuests", the "id" column is an AUTO_INCREMENT field:

Comments
  • Is PostID created as an autogenerated column in DB?
  • This is a db question. Make your PostId field an identity (if using SQL Server, unsure about other dbs) and it will autogenerate the value for you.
  • please add a tag that specifies Database you use
  • If PostID is auto-generated in your DB anything you try to save to that column will be discarded
  • My Post ID look like "PO0001" like that, when i insert one record and before another record insert i want to get last ID and make it like "PO002" when click on button
  • sir i new to this field so how can i use this Code in and i earlier post my current code that i coded, please help me . . thank you
  • 1) Create the table I mentioned. 2) Create a stored procedure that contains the code I wrote. 3) In C# use an SQL Command to call the stored procedure with the values you want to insert as parameter (CommandType = StoredProcedure). If you have troubles with that, please ask a new question.