Stored procedure to insert data checking its existence

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I am working on a stored procedure, and I am getting confused by this part.

I have City, Zip and StateName columns. I need to add the information in the table and should avoid if it already exists. SO that data wouldn't be replicated in the database.

I have the following code. Please help me to figure out the problem.

CREATE PROCEDURE dbo.sproc_InsertAddressElements
   @City nvarchar(100),
   @Zip nvarchar(10),
   @State nvarchar(40)
AS
BEGIN
    SET NOCOUNT ON
    IF NOT EXISTS (Select c.[Name] FROM Cities c WHERE c.[Name]=@City)
    INSERT INTO Cities ([Name])
    VALUES (@City)
    ELSE IF EXISTS (Select c.[Name] FROM Cities c WHERE c.[Name]=@City)

    IF NOT EXISTS (Select z.ZipCode FROM ZipCodes z WHERE z.ZipCode=@Zip)
    INSERT INTO ZipCodes(ZipCode)
    VALUES (@Zip)

    IF NOT EXISTS (Select s.[Name] FROM States s WHERE s.[Name]=@State)
    INSERT INTO States([Name])
    VALUES (@State)


END
GO

I have created and written a procedure as per my understanding. But it is not working as expected.


I think this is more like what you are after, based on the information given.

CREATE PROCEDURE dbo.sproc_InsertAddressElements
@City nvarchar(100)
,@Zip nvarchar(10)
,@State nvarchar(40)
AS
BEGIN
    SET NOCOUNT ON

    IF NOT EXISTS (Select 1 FROM Cities c WHERE c.[Name]=@City)
      Begin 
        INSERT INTO Cities ([Name])
        VALUES (@City)
      End

    IF NOT EXISTS (Select 1 FROM ZipCodes z WHERE z.ZipCode=@Zip)
      Begin
        INSERT INTO ZipCodes(ZipCode)
        VALUES (@Zip)
      End

    IF NOT EXISTS (Select 1 FROM States s WHERE s.[Name]=@State)
      Begin 
        INSERT INTO States([Name])
        VALUES (@State)
      End
END

You might want to consider some other data validation steps, but this should get you heading in the right direction.

Get in the habit of using Begin and End statements correctly too so that the control flow works as expected.

Stored procedure to insert data checking its existence, You can solve this by either adding a transaction around the check and the insert and making sure the checked row is locked for the duration. Or you can combine the check and the insert in 1 query (and still do the locking) as they then will work under the implicit transaction. Introduction. The "EXISTS" condition is used to check if there are any tables and stored procedures with that name. If not, then create one, else delete this existing one and create another brand new one, by adding new features and new options like columns , column types , column type range values. Description.


The danger of doing a check first and then reacting to it later on is that another process might come by in the meantime and cause an unexpected duplicate. You can solve this by either adding a transaction around the check and the insert and making sure the checked row is locked for the duration. Or you can combine the check and the insert in 1 query (and still do the locking) as they then will work under the implicit transaction.

Something along the lines of

CREATE PROCEDURE dbo.sproc_InsertAddressElements
@City nvarchar(100)
,@Zip nvarchar(10)
,@State nvarchar(40)
AS
BEGIN
    SET NOCOUNT ON

    INSERT INTO Cities ([Name])
    SELECT [Name] = @City
     WHERE NOT EXISTS (Select c.[Name] FROM Cities c WITH (UPDLOCK) WHERE c.[Name]=@City)

    INSERT INTO ZipCodes(ZipCode)
    SELECT ZipCode = @Zip
     WHERE NOT EXISTS (Select z.ZipCode FROM WITH (UPDLOCK) ZipCodes z WHERE z.ZipCode=@Zip)

    INSERT INTO States([Name])
    SELECT [Name] = @state
     WHERE NOT EXISTS (Select s.[Name] FROM States s WITH (UPDLOCK) WHERE s.[Name]=@State)

END
GO

ASP.NET 2.0 Instant Results, when the IF NOT EXISTS check returns True is the new item inserted. Otherwise, the stored procedure returns -1 to the SqlDataSource through its returnValue  I am working on a stored procedure, and I am getting confused by this part. I have City, Zip and StateName columns. I need to add the information in the table and should avoid if it already exists. SO that data wouldn't be replicated in the database. I have the following code. Please help me to figure out the problem.


ZipCodes and Cities also inherently contain duplicates. I would question how a City could be associated with a set of ZipCodes and State without having every entry.

but yes, all you should have to do is get rid of the line @Allenman pointed out.

ASP.NET Unleashed, The following stored procedure uses the SQL Exists keyword to check for the existence 1 Else Insert Products ( ProductName, UnitPrice ) Values ( GProductName, already exist, the product is added and the stored procedure exits with its  The INSERT statement is used to add new rows to a table. The UPDATE statement is used to edit and update the values of an existing record. The DELETE statement is used to delete records from a database table. The following SQL stored procedure is used insert, update, delete, and select rows from a table, depending on the statement type parameter.


Stored procedure to check if record exists, This stored procedure for inserting or updateing a customer into the database should be instructional. If you pass the stored procedure an integer  I have create a procedure with successfully add record into database (SQL 2005). But i want to apply my following logic, Check first. IF (EmpNo and Prt_ID (in table1) and Prt_role_typeid (in table2)) already in the database against appsID in table 3. Then { Exit }—don’t insert. ELSE IF


Microsoft SQL Server 2000 Programming by Example, EXAMPLE Nesting Stored Procedures Stored procedures can be nested up to 32 and then when the inner stored procedure finishes its execution, the nesting level stored procedure to check whether the data is already stored in the database, (0&nestlevel AS WARCHAR(5)) IF Øsupplier exists = 0 INSERT INTO dbo. The value will be returned as 1 (True) if record exists and 0 (False) is record does not exists. Using the EXEC function returning value of a Stored Procedure to a variable is supported in all SQL Server versions i.e. 2000, 2005, 2008, 2008R2, 2012, 2014 or higher. TAGs: SQL Server, Stored Procedures


How to find out if a record already exists in a database, If it doesn't , Now it is even easier to check if a record exists in your database, using App You can either do this with a stored procedure or from ASP. If it doesn't exist, we execute our INSERT statement, and then return 'Record Added' to our recordset. of (ex-)Bubble users as well as our own users gave their thoughts on Wappler. This video for the beginner of SQL server programmer who are not fully understand how to checking if data exists do the correct condition and if data not exists do other transaction.