將大量數據從一個表插入到另一個 MySQL Python

Question

初學者在這里提問。 我希望直接從我在同一會話中運行的查詢中填充多行數據的表。 我希望使用 excutemany() 來做到這一點。 目前，我將每一行作為一個元組插入，如下面的腳本所示。

選擇查詢以獲取所需數據：
此查詢返回包含 4 列 Parking_ID、Snapshot_Date、Snapshot_Time、Parking_Stat 的數據

    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"""  

這是腳本的插入部分：
如下所示，我將每一行插入到目標表 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()

如何改進代碼以便在插入命令中插入數據？

謝謝阿米爾

Answer 1

MYSQL 有一個 INSERT INTO 命令，它可能比在 python 中查詢更有效，拉它並重新插入

https://www.mysqltutorial.org/mysql-insert-into-select/