python - 属性错误: 'psycopg2.extensions.cursor' object has no attribute 'fast_executemany'

Question

属性错误:“psycopg2.extensions.cursor”对象没有属性“fast_executemany”

to_sql() 太慢。所以试图解决这个问题。但是当我运行以下代码时，我得到:-

AttributeError: 'psycopg2.extensions.cursor' object has no attribute 'fast_executemany'

@event.listens_for(conn, 'before_cursor_execute')
def receive_before_cursor_execute(conn, cursor, statement, params, context, executemany):
    if executemany:
        cursor.fast_executemany = True
        cursor.commit()

Answer 1

在元组中使用 insert 比 psycopg 中的 executemany 快约 200 倍

args_str = ','.join(cur.mogrify("(%s,%s,%s,%s,%s,%s,%s,%s,%s)", x) for x in tup)
cur.execute("INSERT INTO table VALUES " + args_str) 

相当于

INSERT INTO table VALUES ('a', 'b', 'c'), ('a', 'b', 'c'), ('a', 'b', 'c'), ('a', 'b', 'c');