android SQLite update/insert

问题

I want to UPDATE a row in my table, WHERE key = LastSelected
If a row with that key does not exist, I want to INSERT it.

I can get the UPDATE to work if the row already exists, but it will not INSERT if it is missing.

I have tried these (the first one correctly updates, but does not insert) :

String.format("UPDATE table_1 SET value = '%s' WHERE key = 'LastSelected'", s);

String.format("REPLACE table_1 SET value = '%s' WHERE key = 'LastSelected'", s);

String.format("INSERT OR REPLACE INTO table_1 SET value = '%s' WHERE key = 'LastSelected'", s);

回答1:

The syntax is INSERT OR REPLACE INTO <table> (<columns>) VALUES (<values>), as can be seen in the documentation.

In your case, it would be something like this:

INSERT OR REPLACE INTO table_1 (key, value)
VALUES ('LastSelected', '...')

来源：https://stackoverflow.com/questions/7180441/android-sqlite-update-insert