我想在使用SQLAlchemy向表中插入行时打开pyODBC驱动程序的fast_executemany选项。默认情况下,代码运行速度非常慢......有人可以建议怎么做吗?
编辑:
我正在使用pyODBC 4.0.21和SQLAlchemy 1.1.13,我正在使用的代码的简化示例如下所示。
import sqlalchemy as sa
def InsertIntoDB(self, tablename, colnames, data, create = False):
"""
Inserts data into given db table
Args:
tablename - name of db table with dbname
colnames - column names to insert to
data - a list of tuples, a tuple per row
"""
# reflect table into a sqlalchemy object
meta = sa.MetaData(bind=self.engine)
reflected_table = sa.Table(tablename, meta, autoload=True)
# prepare an input object for sa.connection.execute
execute_inp = []
for i in data:
execute_inp.append(dict(zip(colnames, i)))
# Insert values
self.connection.execute(reflected_table.insert(),execute_inp)
答案 0 :(得分:1)
尝试使用pyodbc
crsr = cnxn.cursor()
crsr.fast_executemany = True
答案 1 :(得分:1)
从1.3版开始,SQLAlchemy直接支持fast_executemany,例如
engine = create_engine(connection_uri, fast_executemany=True)