SpringBoot+Mybatis多数据源

迷南。 2022-05-26 13:38 172阅读 0赞

项目结构图：

![这里写图片描述][70]

有多少数据源就有多少个类 没个数据源对应一个类  
最主要的就是这里的配置，其他的地方，和单数据库使用基本一样。

test1库和test2库，在使用的过程中必须指定主库，不然会报错。我们把test1作为主数据库。

下面只针对test1的相关代码，进行说明，test2库的代码，除了少了@Primary这个注解，其他都和test1一样

主数据源：DataSource1

application.properties:

#Mybatis全局文件 mybatis.config-locations=classpath:yiche/com/mapper/mybatis-config.xml spring.datasource.test1.driverClassName = com.mysql.jdbc.Driver spring.datasource.test1.url = jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8 spring.datasource.test1.username = root spring.datasource.test1.password = xx spring.datasource.test2.driverClassName = com.mysql.jdbc.Driver spring.datasource.test2.url = jdbc:mysql://localhost:3306/test2?useUnicode=true&characterEncoding=utf-8 spring.datasource.test2.username = root spring.datasource.test2.password = xx

@Configuration @MapperScan(basePackages = "yiche.com.mapper.test1", sqlSessionTemplateRef = "test1SqlSessionTemplate") public class DataSource1 { /*主数据源 用primary标志*/ @Bean(name = "test1DataSource") @ConfigurationProperties(prefix = "spring.datasource.test1") @Primary public DataSource getDataSource1() { return DataSourceBuilder.create().build(); } /*工厂*/ @Bean(name = "test1SqlSessionFactory") @Primary public SqlSessionFactory getSqlSessionFactory1(@Qualifier("test1DataSource") DataSource dataSource) throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(dataSource); //实体类的所在包 bean.setTypeAliasesPackage("yiche.com.entity"); //此外还可以设置Mybatis全局文件的所在包 这里没有 这里设置驼峰命名 bean.getObject().getConfiguration().setMapUnderscoreToCamelCase(true); //接口对应的xml文件 bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:yiche/com/mapper/test1/*.xml")); return bean.getObject(); } /*事务管理*/ @Bean(name = "test1TransactionManager") @Primary public DataSourceTransactionManager getDataSourceTransactionManager1(@Qualifier("test1DataSource") DataSource dataSource) { return new DataSourceTransactionManager(dataSource); } @Bean(name = "test1SqlSessionTemplate") @Primary public SqlSessionTemplate getSqlSessionTemplate1(@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) { return new SqlSessionTemplate(sqlSessionFactory); } }

从数据源：DataSource2

@Configuration
    @MapperScan(basePackages = "yiche.com.mapper.test2", sqlSessionTemplateRef = "test2SqlSessionTemplate")
    public class DataSource2 { 
        /*从数据源 不用primary标志*/
        @Bean(name = "test2DataSource")
        @ConfigurationProperties(prefix = "spring.datasource.test2")
        public DataSource getDataSource2() {
            return DataSourceBuilder.create().build();
        }
    
        /*工厂*/
        @Bean(name = "test2SqlSessionFactory")
        public SqlSessionFactory getSqlSessionFactory2(@Qualifier("test2DataSource") DataSource dataSource) throws Exception {
            SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
            bean.setDataSource(dataSource);
            //实体类的所在包
            bean.setTypeAliasesPackage("yiche.com.entity");
            //此外还可以设置Mybatis全局文件的所在包 这里没有 这里设置驼峰命名
            bean.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);
            //接口对应的xml文件
            bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:yiche/com/mapper/test2/*.xml"));
            return bean.getObject();
        }
    
        /*事务管理*/
        @Bean(name = "test2TransactionManager")
        public DataSourceTransactionManager getDataSourceTransactionManager2(@Qualifier("test2DataSource") DataSource dataSource) {
            return new DataSourceTransactionManager(dataSource);
        }
    
        @Bean(name = "test2SqlSessionTemplate")
        public SqlSessionTemplate getSqlSessionTemplate2(@Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
            return new SqlSessionTemplate(sqlSessionFactory);
        }
    
    
    }

主数据源对应的mapper接口

@Component
    public interface EmployeeMapper1 {
    
            List<Employee> getAll();
            Employee getByName(String name);
    }

主数据源使用的EmployeeMapper1.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="yiche.com.mapper.test1.EmployeeMapper1">
    
    
        
        <select id="getByName" resultType="yiche.com.entity.Employee">
            select * from employee where name=#{name}
        </select>
    
    
        <select id="getAll" resultType="yiche.com.entity.Employee">
            select *  from employee
        </select>
    
        <insert id="addEmployee">
            insert into
            employee
            <trim prefix="(" suffix=")" suffixOverrides=",">
    
                <if test="employee.name != null and employee.name!=''">
                    name,
                </if>
    
                <if test="employee.age != null and employee.age!=''">
                    age,
                </if>
    
    
            </trim>
            <trim prefix="values (" suffix=")" suffixOverrides=",">
                <if test="employee.name != null and employee.name!=''">
                    #{name}, jdbcType=VARCHAR},
                </if>
    
                <if test="employee.age != null and employee.age !=''">
                    #{age,jdbcType=VARCHAR},
                </if>
    
            </trim>
        </insert>
    
    
        <update id="update">
            update employee
            <set>
                <if test="name!=null and name!=''">
                    name=#{name},
                </if>
    
            </set>
            where id=#{id}
        </update>
    
    
        <delete id="delete" parameterType="Integer">
            delete from employee where id=#{id}
        </delete>
    
    
    </mapper>

对应的从数据源接口：

@Component
    public interface EmployeeMapper2 {
    
        List<Employee> getAll();
        Employee getByName(String name);
    }

EmployeeMapper2.xml文件:

<?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="yiche.com.mapper.test2.EmployeeMapper2">
    
    
        
        <select id="getByName" resultType="yiche.com.entity.Employee">
            select * from employee where name=#{name}
        </select>
    
    
        <select id="getAll" resultType="yiche.com.entity.Employee">
            select *  from employee
        </select>
    
        <insert id="addUser">
            insert into
            employee
            <trim prefix="(" suffix=")" suffixOverrides=",">
    
                <if test="employee.name != null and employee.name!=''">
                    name,
                </if>
    
                <if test="employee.age != null and employee.age!=''">
                    age,
                </if>
    
    
            </trim>
            <trim prefix="values (" suffix=")" suffixOverrides=",">
                <if test="employee.name != null and employee.name!=''">
                    #{name}, jdbcType=VARCHAR},
                </if>
    
                <if test="employee.age != null and employee.age !=''">
                    #{age,jdbcType=VARCHAR},
                </if>
    
            </trim>
        </insert>
    
    
        <update id="update">
            update employee
            <set>
                <if test="name!=null and name!=''">
                    name=#{name},
                </if>
    
            </set>
            where id=#{id}
        </update>
    
    
        <delete id="delete" parameterType="Integer">
            delete from employee where id=#{id}
        </delete>
    
    
    </mapper>

mybatis-config.xml全集配置文件

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
    <configuration>
    
    </configuration>

Controller测试方法：

@Controller
    public class EmployeeController { 
    
         @Autowired
         EmployeeMapper1 employeeMapper1;
        @Autowired
        EmployeeMapper2 employeeMapper2;
    
    
        @RequestMapping("/test")
            @ResponseBody
             public String test(){
    
                return "ok";
            }
    
         //数据源1的查询
        @RequestMapping("/getAll_1")
        @ResponseBody
        public List<Employee> getAll_1(){
    
            return employeeMapper1.getAll();
        }
        //数据源2的查询
        @RequestMapping("/getAll_2")
        @ResponseBody
        public List<Employee> getAll_2(){
    
            return employeeMapper2.getAll();
    
        }
    
    
        //数据源1的查询
        @RequestMapping("/getByName1")
        @ResponseBody
        public Employee getByName1(){
            String name="cici";
            return employeeMapper1.getByName(name);
        }
        //数据源2的查询
        @RequestMapping("/getByName2")
        @ResponseBody
        public Employee getByName2(){
            String name="gg";
            return employeeMapper2.getByName(name);
        }
    }

pom.xml文件：

<parent>
    
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
    
      </parent>
    
    
    
      <dependencies>
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.11</version>
    
    
        </dependency>
    
        <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter</artifactId>
        </dependency>
    
        <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>1.3.0</version>
        </dependency>
    
        <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
    
        </dependency>
    
        
        <dependency>
          <groupId>tk.mybatis</groupId>
          <artifactId>mapper-spring-boot-starter</artifactId>
          <version>1.1.0</version>
        </dependency>
        
    
    
        <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>druid</artifactId>
          <version>1.0.25</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-test</artifactId>
          <scope>test</scope>
        </dependency>
    
    
      </dependencies>

参考：  
[https://blog.csdn.net/xx326664162/article/details/77235958][https_blog.csdn.net_xx326664162_article_details_77235958]  
[https://www.jianshu.com/p/5e19f9784498][https_www.jianshu.com_p_5e19f9784498]

[70]: /images/20220526/b8b52e2efeda44368f312d472195a22a.png
[https_blog.csdn.net_xx326664162_article_details_77235958]: https://blog.csdn.net/xx326664162/article/details/77235958
[https_www.jianshu.com_p_5e19f9784498]: https://www.jianshu.com/p/5e19f9784498