I am trying to port this line from MS SQL Server to SQLite
IF NOT EXISTS(SELECT 1 FROM EVENTTYPE WHERE EventTypeName = 'ANI Received')
INSERT INTO EVENTTYPE (EventTypeName) VALUES ('ANI Received');
It seems that SQLite does not support IF NOT EXISTS or at least I can't make it work. Am I missing something simple? Is there a workaround?
How about this?
INSERT OR IGNORE INTO EVENTTYPE (EventTypeName) VALUES 'ANI Received'
(Untested as I don't have SQLite... however this link is quite descriptive.)
Additionally, this should also work:
INSERT INTO EVENTTYPE (EventTypeName)
SELECT 'ANI Received'
WHERE NOT EXISTS (SELECT 1 FROM EVENTTYPE WHERE EventTypeName = 'ANI Received');
IGNORE When an applicable constraint violation occurs, the IGNORE resolution algorithm skips the one row that contains the constraint violation and continues processing subsequent rows of the SQL statement as if nothing went wrong. Other rows before and after the row that contained the constraint violation are inserted or updated normally. No error is returned when the IGNORE conflict resolution algorithm is used.If you want to ignore the insertion of existing value, there must be a Key field in your Table. Just create a table With Primary Key Field Like:
CREATE TABLE IF NOT EXISTS TblUsers (UserId INTEGER PRIMARY KEY, UserName varchar(100), ContactName varchar(100),Password varchar(100));
And Then Insert Or Replace / Insert Or Ignore Query on the Table Like:
INSERT OR REPLACE INTO TblUsers (UserId, UserName, ContactName ,Password) VALUES('1','UserName','ContactName','Password');
It Will Not Let it Re-Enter The Existing Primary key Value... This Is how you can Check Whether a Value exists in the table or not.
You can also set a Constraint on a Table with the KEY fields and set On Conflict "Ignore"
When an applicable constraint violation occurs, the IGNORE resolution algorithm skips the one row that contains the constraint violation and continues processing subsequent rows of the SQL statement as if nothing went wrong. Other rows before and after the row that contained the constraint violation are inserted or updated normally. No error is returned when the IGNORE conflict resolution algorithm is used.
you can do "NOT EXISTS" with math, inverting EXISTS output:
SELECT (1-EXISTS(<Your_SELECT>));
Your_SELECT is: SELECT 1 FROM EVENTTYPE WHERE EventTypeName = 'ANI Received'
If exists is 1 , 1-1 result is 0. If exists is 0 , 1-0 result is 1
