AnalyticDB for MySQL allows you to use external tables to import and export data. This topic describes how to use external tables of AnalyticDB for MySQL Data Warehouse Edition (V3.0) to export data from an AnalyticDB for MySQL cluster to an ApsaraDB RDS for MySQL instance.
Prerequisites
- An ApsaraDB RDS for MySQL instance and an AnalyticDB for MySQL cluster are deployed in the same virtual private cloud (VPC). The CIDR block of the VPC is included in an IP address whitelist of the ApsaraDB RDS for MySQL instance. For more information, see Configure an IP address whitelist for an ApsaraDB RDS for MySQL instance.
- A database is created on the ApsaraDB RDS for MySQL instance, and you have logged on to the database. Test data is prepared. For more information, see Create databases and accounts for an ApsaraDB RDS for MySQL instance and Connect to an ApsaraDB RDS for MySQL instance. In this example, a database named
test_adb
is used as the destination database in the ApsaraDB RDS for MySQL instance. A table namedcourses
is created in the database. The table is used to store data that is exported from the AnalyticDB for MySQL cluster. The following statement is used to create the destination table:CREATE TABLE courses ( id bigint NOT NULL, name varchar(32) NOT NULL, grade varchar(32) NOT NULL, submission_date timestamp NOT NULL, PRIMARY KEY (id) );
- If the AnalyticDB for MySQL cluster is in elastic mode, you must turn on ENI in the Network Information section of the Cluster Information page.
Procedure
- Connect to the AnalyticDB for MySQL cluster. For more information, see Connect to an AnalyticDB for MySQL cluster.
- Create a source database. For more information, see Create a database.
In this example, a database named
adb_demo
is used as the source database in the AnalyticDB for MySQL cluster. - Create a source table and insert data into the source table.
Execute the following statement to create a source table named
courses
in theadb_demo
source database. Then, export data in the source table to thecourses
table in thetest_adb
destination database.CREATE TABLE courses ( id bigint AUTO_INCREMENT, name varchar NOT NULL, grade varchar DEFAULT '1st Grade', submission_date timestamp ) DISTRIBUTE BY HASH(id);
Execute the following statement to insert a row of data into thecourses
source table:INSERT INTO courses (name,submission_date) VALUES("Jams",NOW());
- Create an external table. Execute the following statement to create an external table named
courses_external_table
in theadb_demo
database:CREATE TABLE IF NOT EXISTS courses_external_table( id bigint NOT NULL, name varchar(32) NOT NULL, grade varchar(32) NOT NULL, submission_date timestamp NOT NULL, PRIMARY KEY (id) ) ENGINE='mysql' TABLE_PROPERTIES='{ "url":"jdbc:mysql://mysql-vpc-address:3306/test_adb", "tablename":"courses", "username":"mysql-user-name", "password":"mysql-user-password", "charset":"utf8" }';
Parameter Description ENGINE='mysql'
The storage engine that is used for the external table. In this example, MySQL is used. TABLE_PROPERTIES
The connection information that is used by the AnalyticDB for MySQL cluster to access the data in the ApsaraDB RDS for MySQL instance. url
The VPC endpoint of the ApsaraDB RDS for MySQL instance and the name of the destination database. In this example, the name of the destination database is test_adb
. For more information about how to view the VPC endpoint of the ApsaraDB RDS for MySQL instance, see View and change the internal and public endpoints and port numbers of an ApsaraDB RDS for MySQL instance.Format:
"jdbc:mysql://mysql-vpc-address:3306/ecs-database-name"
.Example:
jdbc:mysql://192.168.128.***:3306/test_adb
.tablename
The name of the destination table in the destination ApsaraDB RDS for MySQL database. In this example, courses
is used.username
The name of the account that is used to connect to the destination database in the ApsaraDB RDS for MySQL instance. password
The password of the preceding account. charset
The character set that is used by the source database. Default value: utf8. Valid values: - gbk
- utf8
- utf8mb4
- Import data from the AnalyticDB for MySQL cluster to the ApsaraDB RDS for MySQL instance. Execute the following statement:
REPLACE INTO courses_external_table SELECT * FROM courses;
What to do next
After the data is imported, you can log on to the
test_adb
destination database in the ApsaraDB RDS for MySQL instance. Then, execute the following statement to check whether the data is imported from the source table to the courses
destination table:SELECT * FROM courses LIMIT 100;