springboot + mybatis + druid + 多数据源的问题详解
目录
- 一. 简介
- 二. sql脚本
- 三. 工程搭建
- 3.1 目录结构图
- 3.2 pom.xml文件
- 3.3 application.yml
- 3.4 数据源配置类
- 3.5 Controller
- 3.6 Service
- 3.7 serviceImpl
- 3.8 mapper
- 3.9 mapper.xml
- 3.10 entity
- 3.11 启动类
- 四. 测试
一. 简介
俩个数据库db1,db2, db1数据库的mapper.xml和db2数据库的mapper.xml分别放到不同的目录下, 通过给不同的目录配置不同的数据源,并分别监控各自的事务。
已有新版方案: Mybatis Plus整合多数据源和读写分离,请使用新版;
二. sql脚本
db1数据库的user表:
CREATE TABLE `user` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
db2数据库的role表:
CREATE TABLE `role` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
三. 工程搭建
3.1 目录结构图
3.2 pom.xml文件
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.example</groupId> <artifactId>datasources</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>datasources</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.4.RELEASE</version> <relativePath/> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.4</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.datatype</groupId> <artifactId>jackson-datatype-joda</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.module</groupId> <artifactId>jackson-module-parameter-names</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency> <!-- 分页插件 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.5</version> </dependency> <!-- alibaba的druid数据库连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.9</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <!-- atomikos transaction management --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jta-atomikos</artifactId> </dependency> <!-- swagger --> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>2.6.1</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>2.6.1</version> </dependency> <!-- swagger --> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
3.3 application.yml
server: port: 8080 spring: datasource: db1: driverClassName: com.mysql.jdbc.Driver username: 用户名 password: 密码 # spring2.0此处为jdbc-url jdbc-url: jdbc:mysql://IP:3306/db1?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true type: com.alibaba.druid.pool.DruidDataSource db2: driverClassName: com.mysql.jdbc.Driver username: 用户名 password: 密码 # spring2.0此处为jdbc-url jdbc-url: jdbc:mysql://IP:3306/db2?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true type: com.alibaba.druid.pool.DruidDataSource
3.4 数据源配置类
3.4.1 db1数据库的数据源 (主数据源@Primary)
package com.example.datasources.datasource; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionFactoryBean; import org.mybatis.spring.SqlSessionTemplate; import org.mybatis.spring.annotation.MapperScan; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.boot.context.properties.ConfigurationProperties; 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.io.support.PathMatchingResourcePatternResolver; import org.springframework.jdbc.datasource.DataSourceTransactionManager; import javax.sql.DataSource; @Configuration @MapperScan(basePackages = "com.example.datasources.mapper.db1", sqlSessionTemplateRef = "db1SqlSessionTemplate") public class DataSource1Config { @Bean @ConfigurationProperties(prefix = "spring.datasource.db1") @Primary public DataSource db1DataSource() { return DataSourceBuilder.create().build(); } @Bean @Primary public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(dataSource); bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:com/example/datasources/mapper/db1/*.xml")); return bean.getObject(); } @Bean @Primary public DataSourceTransactionManager db1TransactionManager(@Qualifier("db1DataSource") DataSource dataSource) { return new DataSourceTransactionManager(dataSource); } @Bean @Primary public SqlSessionTemplate db1SqlSessionTemplate(@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception { return new SqlSessionTemplate(sqlSessionFactory); } }
3.4.2 db2数据库的数据源
package com.example.datasources.datasource; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionFactoryBean; import org.mybatis.spring.SqlSessionTemplate; import org.mybatis.spring.annotation.MapperScan; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.boot.jdbc.DataSourceBuilder; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.jdbc.datasource.DataSourceTransactionManager; import javax.sql.DataSource; @Configuration @MapperScan(basePackages = "com.example.datasources.mapper.db2", sqlSessionTemplateRef = "db2SqlSessionTemplate") public class DataSource2Config { @Bean @ConfigurationProperties(prefix = "spring.datasource.db2") public DataSource db2DataSource() { return DataSourceBuilder.create().build(); } @Bean public SqlSessionFactory db2SqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(dataSource); bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:com/example/datasources/mapper/db2/*.xml")); return bean.getObject(); } @Bean public DataSourceTransactionManager db2TransactionManager(@Qualifier("db2DataSource") DataSource dataSource) { return new DataSourceTransactionManager(dataSource); } @Bean public SqlSessionTemplate db2SqlSessionTemplate(@Qualifier("db2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception { return new SqlSessionTemplate(sqlSessionFactory); } }
3.5 Controller
3.5.1 db1的UserController
package com.example.datasources.controller; import com.example.datasources.entity.db1.User; import com.example.datasources.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import java.util.List; @RestController @RequestMapping("/user") public class UserController { @Autowired private UserService userService; @GetMapping("/select/list") public List<User> selectUserList() { return this.userService.selectUserList(); } @GetMapping("/save") public void saveUser(User user) { this.userService.saveUser(user); } }
3.5.2 db2的RoleController
package com.example.datasources.controller; import com.example.datasources.entity.db2.Role; import com.example.datasources.service.RoleService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.List; @RestController @RequestMapping("/role") public class RoleController { @Autowired private RoleService roleService; @GetMapping("/select/list") public List<Role> selectRoleList() { return this.roleService.selectRoleList(); } @GetMapping("/save") public void saveRole(Role role) { this.roleService.saveRole(role); } }
3.6 Service
3.6.1 db1的UserService
package com.example.datasources.service; import com.example.datasources.entity.db1.User; import java.util.List; public interface UserService { List<User> selectUserList(); void saveUser(User user); }
3.6.2 db2的RoleService
package com.example.datasources.service; import com.example.datasources.entity.db2.Role; import java.util.List; public interface RoleService { List<Role> selectRoleList(); void saveRole(Role role); }
3.7 serviceImpl
3.7.1 db1的UserServiceImpl
package com.example.datasources.service.impl; import com.example.datasources.entity.db1.User; import com.example.datasources.mapper.db1.UserMapper; import com.example.datasources.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import java.util.List; @Service public class UserServiceImpl implements UserService { @Autowired private UserMapper userMapper; @Override public List<User> selectUserList() { return this.userMapper.selectUserList(); } @Transactional @Override public void saveUser(User user) { this.userMapper.saveUser(user); // throw new RuntimeException(); } }
3.7.2 db2的RoleServiceImpl
package com.example.datasources.service.impl; import com.example.datasources.entity.db2.Role; import com.example.datasources.mapper.db2.RoleMapper; import com.example.datasources.service.RoleService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import java.util.List; @Service public class RoleServiceImpl implements RoleService { @Autowired private RoleMapper roleMapper; @Override public List<Role> selectRoleList() { return this.roleMapper.selectRoleList(); } // 注:不是主数据源必须要声明其数据源,否则事务不起作用 @Transactional(value = "db2TransactionManager") @Override public void saveRole(Role role) { this.roleMapper.saveRole(role); // throw new RuntimeException(); } }
3.8 mapper
3.8.1 db1的UserMapper
package com.example.datasources.mapper.db1; import com.example.datasources.entity.db1.User; import java.util.List; public interface UserMapper { List<User> selectUserList(); void saveUser(User user); }
3.8.2 db2的RoleMapper
package com.example.datasources.mapper.db2; import com.example.datasources.entity.db2.Role; import java.util.List; public interface RoleMapper { List<Role> selectRoleList(); void saveRole(Role role); }
3.9 mapper.xml
3.9.1 db1的UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.example.datasources.mapper.db1.UserMapper" > <resultMap id="BaseResultMap" type="com.example.datasources.entity.db1.User" > <id column="id" property="id" jdbcType="BIGINT" /> <result column="name" property="name" jdbcType="VARCHAR" /> </resultMap> <sql id="Base_Column_List" > id, `name` </sql> <select id="selectUserList" resultMap="BaseResultMap" > SELECT <include refid="Base_Column_List" /> FROM `user` </select> <insert id="saveUser" parameterType="com.example.datasources.entity.db1.User"> INSERT INTO `user` (id, `name`) VALUES ( #{id}, #{name} ) </insert> </mapper>
3.9.2 db2的RoleMapper.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.example.datasources.mapper.db2.RoleMapper" > <resultMap id="BaseResultMap" type="com.example.datasources.entity.db2.Role" > <id column="id" property="id" jdbcType="BIGINT" /> <result column="name" property="name" jdbcType="VARCHAR" /> </resultMap> <sql id="Base_Column_List" > id, name </sql> <select id="selectRoleList" resultMap="BaseResultMap" > SELECT <include refid="Base_Column_List" /> FROM role </select> <insert id="saveRole" parameterType="com.example.datasources.entity.db2.Role"> INSERT INTO `role` (id, `name`) VALUES ( #{id}, #{name} ) </insert> </mapper>
3.10 entity
3.10.1 db1的User
package com.example.datasources.entity.db1; public class User { private Integer id; private String name; public User() { } public User(Integer id, String name) { this.id = id; this.name = name; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
3.10.2 db2的Role
package com.example.datasources.entity.db2; public class Role { private Integer id; private String name; public Role() { } public Role(Integer id, String name) { this.id = id; this.name = name; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
3.11 启动类
package com.example.datasources; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class DatasourcesApplication { public static void main(String[] args) { SpringApplication.run(DatasourcesApplication.class, args); } }
四. 测试
可以直接在浏览器测试,测试事务的时候可以将异常打开。
需要注意的是: 非主数据源必须要在@Transactional注解中指定数据源,否则事务不起作用。主数据库不需要。
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