Spring Boot and ShardingSphere are both commonly used Java technology frameworks for developing and managing distributed applications. The following are the steps to use Spring Boot and ShardingSphere to implement table and database partitioning:
Add ShardingSphere dependencies
Add ShardingSphere-related dependencies to the pom.xml file of the Spring Boot project, including sharding-jdbc-core, sharding-jdbc-spring-boot-starter, and sharding-jdbc-spring-namespace.
xmlCopy code<dependency><groupId>io.shardingsphere</groupId><artifactId>sharding-jdbc-core</artifactId><version>5.0.0-RC2</version></dependency><dependency><groupId>io.shardingsphere</groupId><artifactId>sharding-jdbc-spring-boot-starter</artifactId><version>5.0.0-RC2</version></dependency><dependency><groupId>io.shardingsphere</groupId><artifactId>sharding-jdbc-spring-namespace</artifactId><version>5.0.0-RC2</version></dependency>
Configure data source
Configure ShardingSphere's data source and sharding rules in the application.properties or application.yml file of the Spring Boot project, for example:
yamlCopy codespring:shardingsphere:datasource:names:ds0,ds1ds0:url:jdbc:mysql://localhost:3306/db0username:rootpassword:rootds1:url:jdbc:mysql://localhost:3306/db1username:rootpassword:rootsharding:tables:user:actualDataNodes:ds${0..1}.user_${0..1}tableStrategy:standard:shardingColumn:idshardingAlgorithmName:userShardingAlgorithmkeyGenerateStrategy:column:idkeyGeneratorName:snowflakedefaultDatabaseStrategy:standard:shardingColumn:user_idshardingAlgorithmName:databaseShardingAlgorithmshardingAlgorithms:databaseShardingAlgorithm:type:INLINEprops:algorithm.expression:ds${user_id%2}userShardingAlgorithm:type:INLINEprops:algorithm.expression:user_${id%2}keyGenerators:snowflake:type:SNOWFLAKEprops:worker.id:123max.vibration.offset:1023
The configuration here defines two data sources (ds0 and ds1), each data source contains a database (db0 and db1), and specifies the rules for sharding databases and tables.
Write DAO layer code
When writing Java code for the DAO layer, you need to use the data source and data access interface provided by ShardingSphere, for example:
javaCopy code@RepositorypublicclassUserDaoImplimplementsUserDao {
@Autowiredprivate JdbcTemplate jdbcTemplate;
@OverridepublicvoidaddUser(User user) {
Stringsql="insert into user (id, name, age) values (?, ?, ?)";
jdbcTemplate.update(sql, user.getId(), user.getName(), user.getAge());
}
After writing the DAO layer code, you can write some simple test cases to test the functionality of the application. For example:
javaCopy code@SpringBootTestpublicclassApplicationTests {
@Autowiredprivate UserDao userDao;
@TestvoidtestAddUser() {
Useruser=newUser();
user.setId(1);
user.setName("John");
user.setAge(30);
userDao . addUser ( user ) ;
}
@TestvoidtestGetUserById() {
Useruser= userDao.getUserById(1);
assertNotNull(user);
assertEquals("John", user.getName());
assertEquals(30, user.getAge());
}
}
The test cases here respectively test the functions of adding users and obtaining user information based on user ID.
In short, to use Spring Boot and ShardingSphere to implement sharding and sharding, you need to first add ShardingSphere dependencies, then configure the data source and sharding rules, write DAO layer code, and finally write test cases to test the functions of the application.