CODEWITHSUNDEEP
pythonsqlite
knight
knight

Reputation: 435

Python: Is sqlite3.Cursor.execute lazy?

Is the sqlite3.Cursor.__iter__ method lazy? I.e. does it calculate all rows upfront and then yields them when iterated over, or does it calculate the rows only when I iterate over them? I am asking this because I am considering whether to add a LIMIT clause to my SQL queries.

Upvotes: 2

Views: 743

Answers (1)

CL.
CL.

Reputation: 180310

The SQLite C API is lazy; the sqlite3_step function computes the next result row on the fly.

As for Python's sqlite3 module, the source code shows that the pysqlite_cursor_iternext function calls pysqlite_step once.

Upvotes: 2

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