二.SpringBoot集成实例系列-xml型多数据源mybatis

谁借莪１个温暖的怀抱￠ 2022-06-13 07:09 173阅读 0赞

**文章列表  
本系列将通过实例分别实现Springboot集成mybatis(mysql),mail,mongodb,cassandra,scheduler,redis,kafka,shiro,websocket。  
具体文章系列如下：  
一.SpringBoot集成实例系列-xml型单数据源mybatis  
二.SpringBoot集成实例系列-xml型多数据源mybatis  
三.SpringBoot集成实例系列-注解型单数据源mybatis  
四.SpringBoot集成实例系列-注解型多数据源mybatis  
五.SpringBoot集成实例系列-邮件email  
六.SpringBoot集成实例系列-单数据源mongodb  
七.SpringBoot集成实例系列-多数据源mongodb  
八.SpringBoot集成实例系列-缓存redis  
九.SpringBoot集成实例系列-数据库cassandra  
十.SpringBoot集成实例系列-定时任务scheduler  
十一.SpringBoot集成实例系列-消息队列kafka  
十二.SpringBoot集成实例系列-消息推送websocket**

上一篇博文我们实现了[SpringBoot集成实例系列-xml型单数据源mybatis][SpringBoot_-xml_mybatis]，该博文只是使用单数据源，而我们的项目中一般都使用多数据源(同源不同库或者不同源等)，那如果出现这种情况我们在springboot中怎么实现呢？本文将通过实例实现springboot集成多数据源。

# 1.需求 #

输出库test中表user的记录和库test2中表user的记录总和

建表语句见博文或源码

# 2.技术要点 #

### 2.1 springboot集成mybatis配置 ###

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配置多个数据源如：

spring.datasource.test1...

spring.datasource.test2...

以此类推

### 2.2 多数据实现 ###

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1)@MapperScan(basePackages = "com.lm.mapper.test1", sqlSessionTemplateRef = "test1SqlSessionTemplate")

配置需要扫描的mapper接口

2)@Bean(name = "test1DataSource")

@ConfigurationProperties(prefix = "spring.datasource.test1")

@Primary

定义datasource,以及已application.properties配置文件数据源对应的名称

@Primary,当多个数据源时，需要定义一个主数据源,即优先考虑被注解的对象注入

3)bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/\*.xml"))

配置数据源对应的myabtis中mapper.xml路径

# 3.代码实现 #

### 3.1 项目结构 ###

![Center 2][]

![Image 1][]

### 3.2 properties配置文件 ###

mybatis.config-locations=classpath:mybatis/mybatis-config.xml
    
    spring.datasource.test1.driverClassName = com.mysql.jdbc.Driver
    spring.datasource.test1.url = jdbc:mysql://192.168.32.128:3306/test?useUnicode=true&characterEncoding=utf-8
    spring.datasource.test1.username = root
    spring.datasource.test1.password = root
    
    
    spring.datasource.test2.driverClassName = com.mysql.jdbc.Driver
    spring.datasource.test2.url = jdbc:mysql://192.168.32.128:3306/test2?useUnicode=true&characterEncoding=utf-8
    spring.datasource.test2.username = root
    spring.datasource.test2.password = root

### 3.3 datasource数据源实现 ###

DataSource1Config文件

package com.lm.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.autoconfigure.jdbc.DataSourceBuilder;
    import org.springframework.boot.context.properties.ConfigurationProperties;
    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;
    
    /**
     * test1数据源
     * 
     * @author liangming.deng
     * @date 2017年6月30日
     *
     */
    @Configuration
    @MapperScan(basePackages = "com.lm.mapper.test1", sqlSessionTemplateRef = "test1SqlSessionTemplate")
    public class DataSource1Config {
    
    	@Bean(name = "test1DataSource")
    	@ConfigurationProperties(prefix = "spring.datasource.test1")
    	@Primary
    	public DataSource testDataSource() {
    		return DataSourceBuilder.create().build();
    	}
    
    	@Bean(name = "test1SqlSessionFactory")
    	@Primary
    	public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource)
    			throws Exception {
    		SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
    		bean.setDataSource(dataSource);
    		bean.setMapperLocations(
    				new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));
    		return bean.getObject();
    	}
    
    	@Bean(name = "test1TransactionManager")
    	@Primary
    	public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
    		return new DataSourceTransactionManager(dataSource);
    	}
    
    	@Bean(name = "test1SqlSessionTemplate")
    	@Primary
    	public SqlSessionTemplate testSqlSessionTemplate(
    			@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
    		return new SqlSessionTemplate(sqlSessionFactory);
    	}
    
    }

DataSource2Config文件

package com.lm.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.autoconfigure.jdbc.DataSourceBuilder;
    import org.springframework.boot.context.properties.ConfigurationProperties;
    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;
    
    /**
     * test2数据源
     * 
     * @author liangming.deng
     * @date 2017年6月30日
     *
     */
    @Configuration
    @MapperScan(basePackages = "com.lm.mapper.test2", sqlSessionTemplateRef = "test2SqlSessionTemplate")
    public class DataSource2Config {
    
    	@Bean(name = "test2DataSource")
    	@ConfigurationProperties(prefix = "spring.datasource.test2")
    	public DataSource testDataSource() {
    		return DataSourceBuilder.create().build();
    	}
    
    	@Bean(name = "test2SqlSessionFactory")
    	public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource)
    			throws Exception {
    		SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
    		bean.setDataSource(dataSource);
    		bean.setMapperLocations(
    				new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test2/*.xml"));
    		return bean.getObject();
    	}
    
    	@Bean(name = "test2TransactionManager")
    	public DataSourceTransactionManager testTransactionManager(@Qualifier("test2DataSource") DataSource dataSource) {
    		return new DataSourceTransactionManager(dataSource);
    	}
    
    	@Bean(name = "test2SqlSessionTemplate")
    	public SqlSessionTemplate testSqlSessionTemplate(
    			@Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
    		return new SqlSessionTemplate(sqlSessionFactory);
    	}
    
    }

### 3.4 User1Mapper和User2Mapper接口 ###

User1Mapper接口

package com.lm.mapper.test1;
    
    import java.util.List;
    
    import com.lm.entity.UserEntity;
    /**
     * mybatis中mapper接口
     * @author liangming.deng
     * @date   2017年6月21日
     *
     */
    public interface User1Mapper {
    	List<UserEntity> getAll();
    
    	UserEntity getUserById(Long id);
    
    	void insert(UserEntity user);
    
    	void update(UserEntity user);
    
    	void delete(Long id);
    }

User2Mapper接口

package com.lm.mapper.test2;
    
    import java.util.List;
    
    import com.lm.entity.UserEntity;
    /**
     * mybatis中mapper接口
     * @author liangming.deng
     * @date   2017年6月21日
     *
     */
    public interface User2Mapper {
    	List<UserEntity> getAll();
    
    	UserEntity getUserById(Long id);
    
    	void insert(UserEntity user);
    
    	void update(UserEntity user);
    
    	void delete(Long id);
    }

### 3.5 mapper.xml文件 ###

User1Mapper.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.lm.mapper.test1.User1Mapper">
    	<resultMap id="BaseResultMap" type="com.lm.entity.UserEntity">
    		<id column="id" property="id" jdbcType="BIGINT" />
    		<result column="userName" property="userName" jdbcType="VARCHAR" />
    		<result column="nickName" property="nickName" jdbcType="VARCHAR" />
    		<result column="passWord" property="passWord" jdbcType="VARCHAR" />
    		<result column="email" property="email" jdbcType="VARCHAR" />
    		<result column="regTime" property="regTime" jdbcType="DATE" />
    		<result column="sex" property="sexEnums" javaType="com.lm.enums.SexEnums" />
    	</resultMap>
    
    	<sql id="Base_Column_List">
    		id, userName, nickName,passWord, email,regTime,sex
    	</sql>
    
    	<select id="getAll" resultMap="BaseResultMap">
    		SELECT
    		<include refid="Base_Column_List" />
    		FROM user
    	</select>
    
    	<select id="getUserById" parameterType="java.lang.Long" resultMap="BaseResultMap">
    		SELECT
    		<include refid="Base_Column_List" />
    		FROM user
    		WHERE id = #{id}
    	</select>
    
    	<insert id="insert" parameterType="com.lm.entity.UserEntity">
    		INSERT INTO
    		user
    		(userName, nickName,passWord, email,regTime,sex)
    		VALUES
    		(#{userName},#{nickName}, #{passWord},#{email}, #{regTime},#{sexEnums})
    	</insert>
    
    	<update id="update" parameterType="com.lm.entity.UserEntity">
    		UPDATE
    		user
    		SET
    		<if test="userName != null">userName = #{userName},</if>
    		<if test="passWord != null">passWord = #{passWord}</if>
    		WHERE
    		id = #{id}
    	</update>
    
    	<delete id="delete" parameterType="java.lang.Long">
    		DELETE FROM
    		user
    		WHERE
    		id =#{id}
    	</delete>
    
    </mapper>

User2Mapper.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.lm.mapper.test2.User2Mapper">
    	<resultMap id="BaseResultMap" type="com.lm.entity.UserEntity">
    		<id column="id" property="id" jdbcType="BIGINT" />
    		<result column="userName" property="userName" jdbcType="VARCHAR" />
    		<result column="nickName" property="nickName" jdbcType="VARCHAR" />
    		<result column="passWord" property="passWord" jdbcType="VARCHAR" />
    		<result column="email" property="email" jdbcType="VARCHAR" />
    		<result column="regTime" property="regTime" jdbcType="DATE" />
    		<result column="sex" property="sexEnums" javaType="com.lm.enums.SexEnums" />
    	</resultMap>
    
    	<sql id="Base_Column_List">
    		id, userName, nickName,passWord, email,regTime,sex
    	</sql>
    
    	<select id="getAll" resultMap="BaseResultMap">
    		SELECT
    		<include refid="Base_Column_List" />
    		FROM user
    	</select>
    
    	<select id="getUserById" parameterType="java.lang.Long" resultMap="BaseResultMap">
    		SELECT
    		<include refid="Base_Column_List" />
    		FROM user
    		WHERE id = #{id}
    	</select>
    
    	<insert id="insert" parameterType="com.lm.entity.UserEntity">
    		INSERT INTO
    		user
    		(userName, nickName,passWord, email,regTime,sex)
    		VALUES
    		(#{userName},#{nickName}, #{passWord},#{email}, #{regTime},#{sexEnums})
    	</insert>
    
    	<update id="update" parameterType="com.lm.entity.UserEntity">
    		UPDATE
    		user
    		SET
    		<if test="userName != null">userName = #{userName},</if>
    		<if test="passWord != null">passWord = #{passWord}</if>
    		WHERE
    		id = #{id}
    	</update>
    
    	<delete id="delete" parameterType="java.lang.Long">
    		DELETE FROM
    		user
    		WHERE
    		id =#{id}
    	</delete>
    
    </mapper>

### 3.6 前端控制器controller ###

package com.lm.web;
    
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import com.lm.entity.UserEntity;
    import com.lm.mapper.test1.User1Mapper;
    import com.lm.mapper.test2.User2Mapper;
    
    /**
     * 前端控制器
     * @author liangming.deng
     * @date   2017年6月30日
     *
     */
    @RestController
    public class UserController {
    
        @Autowired
        private User1Mapper user1Mapper;
    
    	@Autowired
    	private User2Mapper user2Mapper;
    	
    	@RequestMapping("/getUsers")
    	public List<UserEntity> getUsers() {
    		List<UserEntity> users=user1Mapper.getAll();
    		return users;
    	}
    	
    	@RequestMapping("/getAllUserSize")
    	public String getAllUserSize() {
    		int test1UserSize = user1Mapper.getAll().size();
    		int test2UserSize = user2Mapper.getAll().size();
    		StringBuilder sBuilder = new StringBuilder();
    		sBuilder.append("test1UserSize:").append(test1UserSize)
    		.append( " + ")
    		.append("test2UserSize:").append(test2UserSize)
    		.append(" = ").append(test1UserSize+test2UserSize);
    		return sBuilder.toString();
    	}
    	
    	@RequestMapping("/getUser")
        public UserEntity getUser(Long id) {
        	UserEntity user=user2Mapper.getUserById(id);
            return user;
        }
        
        @RequestMapping("/add")
        public void save(UserEntity user) {
            user2Mapper.insert(user);
        }
        
        @RequestMapping(value="update")
        public void update(UserEntity user) {
            user2Mapper.update(user);
        }
        
        @RequestMapping(value="/delete/{id}")
        public void delete(@PathVariable("id") Long id) {
            user1Mapper.delete(id);
        }
        
        
    }

### 3.7 运行效果 ###

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# 4. 代码地址 #

源码地址：

Github:[https://github.com/a123demi/spring-boot-integration][https_github.com_a123demi_spring-boot-integration]

[SpringBoot_-xml_mybatis]: http://blog.csdn.net/a123demi/article/details/74002536
[Image 1]: 
[Center]: /images/20220613/14f56c1a66fb4d65b64a4b02bf49fee1.png
[Center 1]: /images/20220613/4d422f2e0976421d8e08e3a44df0bb99.png
[Center 2]: /images/20220613/2eecfeabd5b644d097b80bf0c9f35977.png
[Center 3]: /images/20220613/cf78056c3db841519f2dde2ebfed7855.png
[https_github.com_a123demi_spring-boot-integration]: https://github.com/a123demi/spring-boot-integration