之前转过一篇《SpringBoot2+Mybatis多个数据源实现》，今天介绍一个其他的解决方案（原理差不多），这里是使用mysql+sqlserver作为数据源，可以供大家参考一下。
一、依赖引入
首先引入必要的jar包，有省略，自行补充pom.xml
<!--连接池 -->
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
<version>3.2.0</version>
</dependency>
<!--mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.31</version>
</dependency>
<!-- sqlserver-->
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>sqljdbc4</artifactId>
<version>4.0</version>
</dependency>
<!-- mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.0</version>
</dependency>
二、代码实现
先创建 DatabaseType，定义两个数据源的名称
public enum DatabaseType {
mysqlDataSource,sqlServerDataSource
}
实现DatabaseContextHolder
public class DatabaseContextHolder {
private static final ThreadLocal<DatabaseType> contextHolder = new ThreadLocal<>();
public static void setDatabaseType(DatabaseType type) {
contextHolder.set(type);
}
public static DatabaseType getDatabaseType() {
return contextHolder.get();
}
}
实现DynamicDataSource
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
public class DynamicDataSource extends AbstractRoutingDataSource {
@Override
protected Object determineCurrentLookupKey() {
return DatabaseContextHolder.getDatabaseType();
}
}
实现MyBatisConfig
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.env.Environment;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;
@Configuration // 该注解类似于spring配置文件
@MapperScan(basePackages = "com.xxx.dao")
public class MyBatisConfig {
@Autowired
private Environment env;
// 读取主数据源
@Bean
public DataSource mysqlDataSource(Environment env) {
Map<String, Object> dsMap = new HashMap<>();
dsMap.put("type", env.getProperty("spring.datasource.type"));
dsMap.put("driver", env.getProperty("spring.datasource.driver-class-name"));
dsMap.put("url", env.getProperty("spring.datasource.url"));
dsMap.put("username", env.getProperty("spring.datasource.username"));
dsMap.put("password", env.getProperty("spring.datasource.password"));
return buildDataSource(dsMap);
}
// 读取从数据源
@Bean
public DataSource sqlServerDataSource(Environment env) {
Map<String, Object> dsMap = new HashMap<>();
dsMap.put("type", env.getProperty("slave.datasource.type"));
dsMap.put("driver", env.getProperty("slave.datasource.driver-class-name"));
dsMap.put("url", env.getProperty("slave.datasource.url"));
dsMap.put("username", env.getProperty("slave.datasource.username"));
dsMap.put("password", env.getProperty("slave.datasource.password"));
return buildDataSource(dsMap);
}
/**
* @Primary 该注解表示在同一个接口有多个实现类可以注入的时候，默认选择哪一个，而不是让@autowire注解报错
* @Qualifier 根据名称进行注入，通常是在具有相同的多个类型的实例的一个注入（例如有多个DataSource类型的实例）
*/
@Bean
@Primary
public DynamicDataSource dataSource(@Qualifier("mysqlDataSource") DataSource mysqlDataSource,
@Qualifier("sqlServerDataSource") DataSource sqlServerDataSource) {
Map<Object, Object> targetDataSources = new HashMap<>();
targetDataSources.put(DatabaseType.mysqlDataSource, mysqlDataSource);
targetDataSources.put(DatabaseType.sqlServerDataSource, sqlServerDataSource);
DynamicDataSource dataSource = new DynamicDataSource();
dataSource.setTargetDataSources(targetDataSources);// 该方法是AbstractRoutingDataSource的方法
dataSource.setDefaultTargetDataSource(mysqlDataSource);// 默认的datasource设
return dataSource;
}
/**
* 根据数据源创建SqlSessionFactory
*/
@Bean
public SqlSessionFactory sqlSessionFactory(DynamicDataSource ds) throws Exception {
SqlSessionFactoryBean fb = new SqlSessionFactoryBean();
fb.setDataSource(ds);// 指定数据源(这个必须有，否则报错)
// 下边两句仅仅用于*.xml文件，如果整个持久层操作不需要使用到xml文件的话（只用注解就可以搞定），则不加
//fb.setTypeAliasesPackage(env.getProperty("mybatis.typeAliasesPackage"));// 指定基包
fb.setConfigLocation(new PathMatchingResourcePatternResolver().getResource(env.getProperty("mybatis.config-location")));
fb.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(env.getProperty("mybatis.mapper-locations")));
return fb.getObject();
}
/**
* 配置事务管理器
*/
@Bean
public DataSourceTransactionManager transactionManager(DynamicDataSource dataSource) throws Exception {
return new DataSourceTransactionManager(dataSource);
}
/**
* 创建DataSource
* @param dataSourceMap
* @return
*/
public DataSource buildDataSource(Map<String, Object> dataSourceMap) {
try {
Object type = dataSourceMap.get("type");
Class<? extends DataSource> dataSourceType = (Class<? extends DataSource>) Class.forName((String) type);
String driverClassName = dataSourceMap.get("driver").toString();
String url = dataSourceMap.get("url").toString();
String username = dataSourceMap.get("username").toString();
String password = dataSourceMap.get("password").toString();
// 自定义DataSource配置
DataSourceBuilder factory = DataSourceBuilder.create().driverClassName(driverClassName).url(url)
.username(username).password(password).type(dataSourceType);
return factory.build();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return null;
}
}
三、yml文件配置
application.yml
server:
tomcat:
uri-encoding: UTF-8
max-threads: 1000
min-spare-threads: 30
port: 8888
spring:
profiles:
active: dev
#mybatis
mybatis:
mapper-locations: classpath:mybatis/mappers/*.xml
config-location: classpath:mybatis/mybatis-config.xml
定义application-dev.yml
#mysql
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:33306/test1?useAffectedRows=true&characterEncoding=utf8
username: root
password: root
type: com.zaxxer.hikari.HikariDataSource
hikari:
connection-timeout: 30000
idle-timeout: 600000
max-lifetime: 1800000
maximum-pool-size: 10
#sqlserver
slave:
datasource:
driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver
url: jdbc:sqlserver://127.0.0.1:1433;DatabaseName=test2;
username: sa
password: 123456
type: com.zaxxer.hikari.HikariDataSource
hikari:
connection-timeout: 30000
idle-timeout: 600000
max-lifetime: 1800000
maximum-pool-size: 10
四、使用方式
建议在service实现类里面使用
public List<Demo> queryList(){
//切换数据源
DatabaseContextHolder.setDatabaseType(DatabaseType.sqlServerDataSource);
Map<String,Object> map = new HashMap<>();
return demoDao.queryList(map);
}
public List<Demo> selectList(){
//切换数据源
DatabaseContextHolder.setDatabaseType(DatabaseType.mysqlDataSource);
Map<String,Object> map = new HashMap<>();
return demoDao.queryList(map);
}
五、其他
hikari相关配置
hikari:
connection-timeout: 30000
idle-timeout: 600000
max-lifetime: 1800000
maximum-pool-size: 10
数据源配置类MyBatisConfig
package com.xxx.config;
import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.env.Environment;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;
@Configuration // 该注解类似于spring配置文件
@MapperScan(basePackages = "com.xxx.dao")
public class MyBatisConfig {
@Autowired
private Environment env;
// 读取主数据源
@Bean
public DataSource mysqlDataSource(Environment env) {
HikariConfig config = new HikariConfig();
config.setDriverClassName(env.getProperty("spring.datasource.driver-class-name"));
config.setJdbcUrl(env.getProperty("spring.datasource.url"));
config.setUsername(env.getProperty("spring.datasource.username"));
config.setPassword(env.getProperty("spring.datasource.password"));
config.setConnectionTestQuery(env.getProperty("spring.datasource.ConnectionTestQuery"));
config.setMaximumPoolSize(Integer.parseInt(env.getProperty("spring.datasource.hikari.maximum-pool-size")));
config.setIdleTimeout(Integer.parseInt(env.getProperty("spring.datasource.hikari.idle-timeout")));
config.setMaxLifetime(Integer.parseInt(env.getProperty("spring.datasource.hikari.max-lifetime")));
config.setConnectionTimeout(Integer.parseInt(env.getProperty("spring.datasource.hikari.connection-timeout")));
DataSource dataSource = new HikariDataSource(config);
return dataSource;
}
// 读取从数据源
@Bean
public DataSource sqlServerDataSource(Environment env) {
HikariConfig config = new HikariConfig();
config.setDriverClassName(env.getProperty("slave.datasource.driver-class-name"));
config.setJdbcUrl(env.getProperty("slave.datasource.url"));
config.setUsername(env.getProperty("slave.datasource.username"));
config.setPassword(env.getProperty("slave.datasource.password"));
config.setConnectionTestQuery(env.getProperty("slave.datasource.ConnectionTestQuery"));
config.setMaximumPoolSize(Integer.parseInt(env.getProperty("slave.datasource.hikari.maximum-pool-size")));
config.setIdleTimeout(Integer.parseInt(env.getProperty("slave.datasource.hikari.idle-timeout")));
config.setMaxLifetime(Integer.parseInt(env.getProperty("slave.datasource.hikari.max-lifetime")));
config.setConnectionTimeout(Integer.parseInt(env.getProperty("slave.datasource.hikari.connection-timeout")));
DataSource dataSource = new HikariDataSource(config);
return dataSource;
}
/**
* @Primary 该注解表示在同一个接口有多个实现类可以注入的时候，默认选择哪一个，而不是让@autowire注解报错
* @Qualifier 根据名称进行注入，通常是在具有相同的多个类型的实例的一个注入（例如有多个DataSource类型的实例）
*/
@Bean
@Primary
public DynamicDataSource dataSource(@Qualifier("mysqlDataSource") DataSource mysqlDataSource,
@Qualifier("sqlServerDataSource") DataSource sqlServerDataSource) {
Map<Object, Object> targetDataSources = new HashMap<>();
targetDataSources.put(DatabaseType.mysqlDataSource, mysqlDataSource);
targetDataSources.put(DatabaseType.sqlServerDataSource, sqlServerDataSource);
DynamicDataSource dataSource = new DynamicDataSource();
dataSource.setTargetDataSources(targetDataSources);// 该方法是AbstractRoutingDataSource的方法
dataSource.setDefaultTargetDataSource(mysqlDataSource);// 默认的datasource设
return dataSource;
}
/**
* 根据数据源创建SqlSessionFactory
*/
@Bean
public SqlSessionFactory sqlSessionFactory(DynamicDataSource ds) throws Exception {
SqlSessionFactoryBean fb = new SqlSessionFactoryBean();
fb.setDataSource(ds);// 指定数据源(这个必须有，否则报错)
// 下边两句仅仅用于*.xml文件，如果整个持久层操作不需要使用到xml文件的话（只用注解就可以搞定），则不加
//fb.setTypeAliasesPackage(env.getProperty("mybatis.typeAliasesPackage"));// 指定基包
fb.setConfigLocation(new PathMatchingResourcePatternResolver().getResource(env.getProperty("mybatis.config-location")));
fb.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(env.getProperty("mybatis.mapper-locations")));//
return fb.getObject();
}
/**
* 配置事务管理器
*/
@Bean
public DataSourceTransactionManager transactionManager(DynamicDataSource dataSource) throws Exception {
return new DataSourceTransactionManager(dataSource);
}
}
