CODEWITHSUNDEEP
pythonpython-3.xsqlite
Gnarlodious
Gnarlodious

Reputation: 324

Python variable replacement in Sqlite3 INSERT statement

Is there a way to use Python's variable replacement when updating Sqlite data targeting a known rowid? I am trying to say something like:

cursor.execute('INSERT INTO Words(rowid,f1,f2) VALUES(?,?,?)', [rowid,2,3])

The problem is that this fails with error:

sqlite3.IntegrityError: PRIMARY KEY must be unique

I want to write a list of values into the table's existing record without changing the rowid number. What's the accepted way to update all fields from a list of values?

Upvotes: 0

Views: 6139

Answers (1)

Martijn Pieters
Martijn Pieters

Reputation: 1124818

You use UPDATE instead of INSERT:

cursor.execute('UPDATE Words SET f1=?, f2=? WHERE rowid=?', [2, 3, rowid])

This tells the database to update the f1 and f2 columns with new values, for all rows where rowid matches your specified value.

Alternatively, use the INSERT OR REPLACE syntax; if a uniqueness constraint (such as the primary key not being unique) is violated, an UPDATE is issued instead, but if rowid is not yet present a new row will be inserted:

cursor.execute('INSERT OR REPLACE INTO Words(rowid,f1,f2) VALUES(?,?,?)', [rowid,2,3])

Upvotes: 3

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