if exist update else insert sqlite
The update() function returns how many rows were affected. So if there were none, you know that you must insert instead:,If you have a unique constraint on the key field, you could use the INSERT OR REPLACE command which automatically deletes the old record if the new one ... , http://blog.derjohng.com/2012/11/15/if-exists-insert-and-update-in-mysql/ ... ELSE INSERT INTO Table1 VALUES (...) 或者. UPDATE Table1 ...,,In SQLite you can do INSERT OR REPLACE rather than a normal INSERT if you've defined a primary key on your table. If another row in the table already exists ... , If you set unique key on your table, then you can first do it insert and if error duplicity record then catch them and do it update. This usually faster ...,In the second step, if any constraint violation e.g., NOT NULL constraint ... into the positions table if it does not exist, if the position exists, update the current one. ,Option 1: Insert -> Update. If you like to avoid both changes()=0 and INSERT OR IGNORE even if you cannot afford deleting the row - You can use this logic; First, insert (if not exists) and then update by filtering with the unique key. , Use INSERT OR REPLACE which does exactly what you want : insert a new row when the name does not exists or update otherwise.
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 if exist update else insert sqlite 相關參考資料
How to update sqlite table if records exist else insert? - Stack ...
The update() function returns how many rows were affected. So if there were none, you know that you must insert instead: https://stackoverflow.com if exist update or else insert in sqlite3 - Stack Overflow
If you have a unique constraint on the key field, you could use the INSERT OR REPLACE command which automatically deletes the old record if the new one ... https://stackoverflow.com If Exists INSERT and UPDATE （SQLite） - cczallen's Blog - Logdown
http://blog.derjohng.com/2012/11/15/if-exists-insert-and-update-in-mysql/ ... ELSE INSERT INTO Table1 VALUES (...) 或者. UPDATE Table1 ... http://cczallen-blog.logdown.c INSERT IF NOT EXISTS ELSE UPDATE? - Stack Overflow
https://stackoverflow.com sql - SQLite - update (not replace) if exists, else insert - Stack Overflow
In SQLite you can do INSERT OR REPLACE rather than a normal INSERT if you've defined a primary key on your table. If another row in the table already exists ... https://stackoverflow.com SQLite insert if not exists else update - Stack Overflow
If you set unique key on your table, then you can first do it insert and if error duplicity record then catch them and do it update. This usually faster ... https://stackoverflow.com SQLite REPLACE: Insert or Replace The Existing Row - SQLite Tutorial
In the second step, if any constraint violation e.g., NOT NULL constraint ... into the positions table if it does not exist, if the position exists, update the current one. http://www.sqlitetutorial.net SQLite UPSERT UPDATE OR INSERT - Stack Overflow
Option 1: Insert -> Update. If you like to avoid both changes()=0 and INSERT OR IGNORE even if you cannot afford deleting the row - You can use this logic; First, insert (if not exists) and then up... https://stackoverflow.com Sqlite: Insert if not exist, Update if exist - Stack Overflow
Use INSERT OR REPLACE which does exactly what you want : insert a new row when the name does not exists or update otherwise. https://stackoverflow.com |