sqlite select if exists
The EXISTS operator always evaluates to one of the integer values 0 and 1. If executing the SELECT statement specified as the right-hand operand of the ... ,Don't call fetchone() ; just treat the cursor as an iterator: for row in c.execute("SELECT name, age FROM ..."): name, age = row break else: print("not found").
| 相關軟體 SQLite 資訊 | |
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 sqlite select if exists 相關參考資料
"Insert if not exists" statement in SQLite - Stack Overflow
If you have a table called memos that has two columns id and text you should be able to do like this: INSERT INTO memos(id,text) SELECT 5, 'text to insert' ... https://stackoverflow.com Android sqlite how to check if a record exists - Stack Overflow
The EXISTS operator always evaluates to one of the integer values 0 and 1. If executing the SELECT statement specified as the right-hand operand of the ... https://stackoverflow.com Check if a row exists in sqlite3? - Stack Overflow
Don't call fetchone() ; just treat the cursor as an iterator: for row in c.execute("SELECT name, age FROM ..."): name, age = row break else: print("not found"). https://stackoverflow.com How to check the existence of a row in SQLite with Python? - Stack ...
If you desire to know the rowid , then using fetchall requires you to burrow through the ... for name in ('bar','foo'): cursor.execute("SELECT rowid FROM components .... exist = c... https://stackoverflow.com How to do IF NOT EXISTS in SQLite - Stack Overflow
INSERT INTO EVENTTYPE (EventTypeName) SELECT 'ANI Received' WHERE NOT EXISTS (SELECT 1 FROM EVENTTYPE WHERE EventTypeName = 'ANI ... https://stackoverflow.com sqlite - how to check if table exists before completing inserts ...
To check that your table exists or not, you can use: SELECT * FROM sqlite_master WHERE name ='myTable' and type='table';. https://stackoverflow.com SQLite EXISTS - SQLite Tutorial
Introduction to SQLite EXISTS operator. The EXISTS operator is a logical operator that specifies a subquery to test for the existence of rows. In this syntax, the subquery is a SELECT statement that r... http://www.sqlitetutorial.net SQLite IF Exists Clause - Stack Overflow
select exists( select 1 from tbl_stats_assigned where username = 'abc' ); Assuming of course that your 1 and 0 are actually boolean values (which SQLite represents with one and zero just like ... https://stackoverflow.com SQLite: EXISTS Condition - TechOnTheNet
The SQLite EXISTS condition is used in combination with a subquery and is considered "to be met" if the subquery returns at least one row. It can be used in a SELECT, INSERT, UPDATE, or DELE... https://www.techonthenet.com Valid query to check if row exists in SQLite3 - Stack Overflow
Though the documentation does not imply it, apparently the primary sqlite dev (Richard Hipp) has confirmed in the mailing list that EXISTS short circuits for you. https://stackoverflow.com |