MySQL command line import and export data

In refactoring the system , The original system used MySQL, Now we need to change to PostgreSQL, So you need to migrate the data . The current plan is to export the records of the production database , Import to a backup Library of the test environment , Then the program will convert the data into a new PostgreSQL database , Therefore, the production database export is involved , Because the production database cannot be used Navicat Other software connections , So you can only export from the command line , Make a note of .

export

This step does not require logging into the database , Use it directly mysqldumpl Command to export .

Export the entire library

mysqldump -u user name -p Database name > Exported file name

mysqldump -u root -p --databases db_name > test_db.sql

Export a table

mysqldump -u user name -p Database name Table name > Exported file name

Only export the database structure , Without data

mysqldump -u user name -p -d Database name > Exported file name

-d : Just back up the structure , Don't back up data . You can also use ”–no-data” Instead of ”-d”, The effect is the same .

example ：

If appear -bash: mysqldump: command not found The error of , The processing is as follows ：

find MySQL Installation path for ,

find / -name mysql -print

stay /usr/bin Create under directory mysqldump The soft links

My installation path here is /usr/local/mysql/bin/mysqldump ,

Carry out orders ln -fs /usr/local/mysql/bin/mysqldump /usr/bin/

After execution, you can use mysqldump The command .

Import

1. Get into MySQL：mysql -u user name -p
2. Create a new database , Or go to the database where you want to import data

Input ：mysql>create database The name of the database to be created ;

Or input :mysql>use Database name to use ;

1. Import files , Use source Command to import the file

Enter the command line ：mysql>source / File path / file name .sql;

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