[英]Insert bulk of data from one table to another MySQL Python
初学者在这里提问。 我希望直接从我在同一会话中运行的查询中填充多行数据的表。 我希望使用 excutemany() 来做到这一点。 目前,我将每一行作为一个元组插入,如下面的脚本所示。
选择查询以获取所需数据:
此查询返回包含 4 列 Parking_ID、Snapshot_Date、Snapshot_Time、Parking_Stat 的数据
park_set_stat_query = "SET @row_number = 0;"
park_set_stat_query2 = "SET @row_number2 = 0;"
# one time load to catch only the changes done in the input table
park_change_stat_query = """select in1.Parking_ID,
in1.Snapshot_Date as Snapshot_Date,
in1.Snapshot_Time as Snapshot_Time,
in1.Parking_Stat
from (SELECT
Parking_ID,
Snapshot_Date,
Snapshot_Time,
Parking_Stat,
(@row_number:=@row_number + 1) AS num1
from Fact_Parking_Stat_Input
WHERE Parking_Stat<>0) as in1
left join (SELECT
Parking_ID,
Snapshot_Date,
Snapshot_Time,
Parking_Stat,
(@row_number2:=@row_number2 + 1)+1 AS num2
from Fact_Parking_Stat_Input
WHERE Parking_Stat<>0) as in2
on in1.Parking_ID=in2.Parking_ID and in1.num1=in2.num2
WHERE (CASE WHEN in1.Parking_Stat<>in2.Parking_Stat THEN 1 ELSE 0 END=1) OR num1=1"""
这是脚本的插入部分:
如下所示,我将每一行插入到目标表 Fact_Parking_Stat_Input_Alter
mycursor = connection.cursor()
mycursor2 = connection.cursor()
mycursor.execute(park_set_stat_query)
mycursor.execute(park_set_stat_query2)
mycursor.execute(park_change_stat_query)
# # keep only changes in a staging table named Fact_Parking_Stat_Input_Alter
qSQLresults = mycursor.fetchall()
for row in qSQLresults:
Parking_ID = row[0]
Snapshot_Date = row[1]
Snapshot_Time = row[2]
Parking_Stat = row[3]
#SQL query to INSERT a record into the table Fact_Parking_Stat_Input_Alter.
mycursor2.execute('''INSERT into Fact_Parking_Stat_Input_Alter (Parking_ID, Snapshot_Date, Snapshot_Time, Parking_Stat)
values (%s, %s, %s, %s)''',
(Parking_ID, Snapshot_Date, Snapshot_Time, Parking_Stat))
# Commit your changes in the database
connection.commit()
mycursor.close()
mycursor2.close()
connection.close()
如何改进代码以便在插入命令中插入数据?
谢谢阿米尔
MYSQL 有一个 INSERT INTO 命令,它可能比在 python 中查询更有效,拉它并重新插入
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