How does MySQL copy table data from one database to another (two databases are not linked to the same database)

1. demand ：

hold A database connection （ Such as ：test） A table in a database in ( Such as ：warn_message) The data of , Batch copy to Another database connection （ Such as ：localhost） A table in a database in ( Such as ：warn_message) in

Two warn_message The data structure of the table is consistent

2. Realization

mysql Batch add statements ：

  insert into  Table name （ Field 1, Field 2, Field 3）values ( Field 1 Value , Field 1 Value , Field 1 Value ）,( Field 1 Value , Field 1 Value , Field 1 Value );

The next step is to assemble values hinder value , To achieve the effect of batch replication ：

2.1 Put the data to be copied Copy and paste to excel in

2.2 Handle excel Data in

Then modify according to the requirements excel Data in , Such as Delete self incrementing primary key id, Modification of special formats such as time fields
hold excel Assemble into It can be in batches Added parameters

① Delete id Column

② Chinese content 、 Time column Both ends add to Single quotation marks

Select the Chinese column , Right click —》 Format cell —》 Check customize , Select the following types , Add Single quotation marks , Click ok ：

Time column Same treatment ：

③ Beginning and end of each line add to Brackets

④ Null values should be processed into null perhaps Empty single quotation mark

If you don't deal with , Will report a mistake , See below .

⑤ file save as *.csv file

Select in the pop-up window yes ：

⑥ In the form of Notepad Open the top 333.csv file

Find the contents in Notepad leave The goal is Almost , More Double quotes !!!
resolvent ： Global replacement “”, Get the following ：

2.3 Copy the contents of the Notepad to mysql Client tools , Splicing Batch insert statements

Error report in execution ： explain Null values should also be processed . Processing into null Or an empty string

After processing the sql The sentence is ：

INSERT INTO `warn_message`(`device_id`, `device_type`, `extend_json`, `install_place_id`, `pound_order_id`, `rational_deviation`, `real_deviation`, `overtime_duration`, `warn_type`, `deal_flag`, `deal_result`, `active_flag`, `created_user`, `created_time`, `updated_user`, `updated_time`, `warning_level`, `organization_id`, `start_time`, `end_time`, `description`, `resolver`, `third_warn_id`, `relation_user_id`) VALUES 
(1842,8,null,102,0,0,0,0,0,1,' The system automatically cancels the alert ',1,0,'2021/2/3 11:23',0,'2021/2/3 14:40',3,1047,'2021/2/3 11:23','2021/2/3 14:40',null,null,6534,null),
(1842,8,null,102,0,0,0,0,0,1,' The system automatically cancels the alert ',1,0,'2021/2/3 11:43',0,'2021/2/3 14:40',3,1047,'2021/2/3 11:43','2021/2/3 14:40',null,null,6534,null),
(1842,8,null,102,0,0,0,0,0,0,' The system automatically cancels the alert ',1,0,'2021/2/3 12:11',0,'2021/2/3 13:56',3,1047,'2021/2/3 12:11','2021/2/3 13:56',null,null,6534,null),
(1842,8,null,102,0,0,0,0,8,1,' The system automatically cancels the alert ',1,0,'2021/2/3 13:56',0,'2021/9/30 11:48',3,1047,'2021/2/3 13:56','2021/2/3 14:40',' Fireworks ',null,6534,null),
(1842,8,null,102,0,0,0,0,8,1,' The system automatically cancels the alert ',1,0,'2021/2/3 13:59',0,'2021/9/30 11:48',3,1047,'2021/2/3 13:59','2021/2/3 14:40',' Fireworks ',null,6534,null),
(1842,8,null,102,0,0,0,0,8,1,' The system automatically cancels the alert ',1,0,'2021/2/3 14:06',0,'2021/9/30 11:48',3,1047,'2021/2/3 14:06','2021/2/3 14:40',' Fireworks ',null,6534,null),
(1842,8,null,102,0,0,0,0,8,1,' The system automatically cancels the alert ',1,0,'2021/2/3 14:10',0,'2021/9/30 11:48',3,1047,'2021/2/3 14:10','2021/2/3 14:40',' Fireworks ',null,6534,null),
(1842,8,null,102,0,0,0,0,8,0,' The system automatically cancels the alert ',1,0,'2021/2/3 14:40',0,'2021/9/30 11:48',3,1047,'2021/2/3 14:40',null,' Fireworks ',null,6534,null)

The operation results are as follows ：


Batch insert succeeded ！！

2.4 Be careful ：excel Hollow values also need to be handled

excel Data in Handle the points needing attention ：
① Chinese and time All need to be added Single quotation marks
② Null values also need to be processed Processing into null perhaps Empty Single quotation marks