Mybatis多数据源切换实现代码

Mybatis多数据源切换实现代码

这次要完成的是从一个数据库中读取数据，然后再把数据插入到另一个数据库中。在同一套项目代码中要完成这个操作，就不可避免的涉及到了多数据源。本文即介绍在mybatis中完成多数据源的切换相关内容

指定数据源一

@Configuration

// 扫描 MAPPer 接口并容器管理

@MapperScan(basePackages = MasterDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "masterSqlSessionFactory")

public class MasterDataSourceConfig {

// 精确到 master 目录，以便跟其他数据源隔离

static final String PACKAGE = "com.datareach.kafka.dao.master";

static final String MAPPER_LOCATION = "classpath:mapper/master/*.xml";

//application.yml中的值可以通过@Value注解进行读取

@Value("${master.datasource.url}")

private String url;

@Value("${master.datasource.username}")

private String user;

@Value("${master.datasource.password}")

private String password;

@Value("${master.datasource.driver-class-name}")

private String driverClass;

@Bean(name = "masterDataSource")

@Primary

public DataSource masterDataSource() {

DruidDataSource dataSource = new DruidDataSource();

dataSource.setDriverClassName(driverClass);

dataSource.setUrl(url);

dataSource.setUsername(user);

dataSource.setPassword(password);

return dataSource;

}

@Bean(name = "masterTransactionManager")

@Primary

public DataSourceTransactionManager masterTransactionManager() {

return new DataSourceTransactionManager(masterDataSource());

}

@Bean(name = "masterSqlSessionFactory")

@Primary

public SqlSessionFactory masterSqlSessionFactory(@Qualifier("masterDataSource") DataSource masterDataSource)

throws Exception {

final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();

sessionFactory.setDataSource(masterDataSource);

sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()

.getResources(MasterDataSourceConfig.MAPPER_LOCATION));

return sessionFactory.getObject();

}

}

数据源一的相关配置

# master 数据源配置

master:

datasource:

url: jdbc:postgresql://localhost:5432/postgres?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&serverTimezone=GMT%2B8

driver-class-name: org.postgresql.Driver

username: product

password:

initial-size: 1

min-idle: 1

max-active: 20

test-on-borrow: true

max-wait: 60000

time-between-eviction-runs-millis: 60000

min-evictable-idle-time-millis: 300000

validation-query: SELECT 1 FROM DUAL

test-While-Idle: true

test-on-return: false

pool-prepared-statements: false

max-pool-prepared-statement-per-connection-size: 20

filters: stat,wall,log4j,config

指定数据源二

@Configuration

// 扫描 Mapper 接口并容器管理

@MapperScan(basePackages = SecondDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "secondSqlSessionFactory")

public class SecondDataSourceConfig {

// 精确到 cluster 目录，以便跟其他数据源隔离

static final String PACKAGE = "com.datareach.kafka.dao.secondary";

static final String MAPPER_LOCATION = "classpath:mapper/secondary/*.xml";

@Value("${second.datasource.url}")

private String url;

@Value("${second.dahttp://tasource.username}")

private String user;

@Value("${second.datasource.password}")

private String password;

@Value("${second.datasource.driver-class-name}")

private String driverClass;

@Bean(name = "secondDataSource")

public DataSource clusterDataSource() {

DruidDataSource dataSource = new DruidDataSource();

dataSource.setDriverClassName(driverClass);

dataSource.setUrl(url);

dataSource.setUsername(user);

dataSource.setPassword(password);

return dataSource;

}

@Bean(name = "secondTransactionManager")

public DataSourceTransactionManager clusterTransactionManager() {

return new DataSourceTransactionManager(clusterDataSource());

}

@Bean(name = "secondSqlSessionFacgiCnrcvtory")

public SqlSessionFactory clusterSqlSessionFactory(@Qualifier("secondDataSource") DataSource clusterDataSource)

throws Exception {

final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();

sessionFactory.setDataSource(clusterDataSource);

sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()

.getResources(SecondDataSourceConfig.MAPPER_LOCATION));

return sessionFactory.getObject();

}

}

数据源二的相关配置

second:

datasource:

url: jdbc:mysql://localhost:40000/PG_Data?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&serverTimezone=GMT%2B8

username: root

password:

driver-class-name: com.mysql.jdbc.Driver

max-idle: 10

max-wait: 10000

min-idle: 5

initial-size: 5

其实就是实例化了两个SqlSessionFactory——masterSqlSessionFactory和secondSqlSessionFactory，然后通过注解@MapperScan指定扫描指定的mapper接口时用指定的SqlSessionFactory进行连接构建，从而实现了多数据源。

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