How Can Psycopg2\'s `mogrify` Method Speed Up Multiple Row Inserts?

Efficiently Inserting Multiple Rows with Psycopg2

Psycopg2 offers a mogrify method that can simplify the task of inserting multiple rows into a database with a single query. This approach can prove more efficient than using the executemany method, especially for large datasets.

To illustrate, the following code snippet demonstrates how to insert 2000 rows into a table:

args = [(1, 2), (3, 4), (5, 6)]
args_str = ','.join(cur.mogrify("(%s,%s)", x) for x in tup)
cur.execute("INSERT INTO table VALUES " + args_str)

This method proved to be significantly faster than using executemany in this specific scenario, taking only 10 seconds compared to 2 minutes. The mogrify method in psycopg2 prepares a query string for each row, avoiding the need to iterate over the list of rows multiple times as required by the executemany method.

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