SpringBoot使用MyBatis多数据源

SpringBoot使用MyBatis多数据源

我们以 Mybatis Xml和注解两种版本为例，给大家展示如何如何配置多数据源。

1、注解方式

数据库文件：

DROP TABLE IF EXISTS `users`;
CREATE TABLE `users` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键id',`userName` varchar(32) DEFAULT NULL COMMENT '用户名',`passWord` varchar(32) DEFAULT NULL COMMENT '密码',`user_sex` varchar(32) DEFAULT NULL,`nick_name` varchar(32) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

1.1 pom依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.0.RELEASE</version><relativePath/></parent><groupId>com.example</groupId><artifactId>spring-boot-mybatis-annotation-mulidatasource</artifactId><version>0.0.1-SNAPSHOT</version><name>spring-boot-mybatis-annotation-mulidatasource</name><description>spring-boot-mybatis-annotation-mulidatasource</description><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><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>2.0.0</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

1.2 配置文件

mybatis.type-aliases-package=com.example.modelspring.datasource.test1.jdbc-url=jdbc:mysql://localhost:3306/test1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.test1.username=root
spring.datasource.test1.password=root
spring.datasource.test1.driver-class-name=com.mysql.cj.jdbc.Driverspring.datasource.test2.jdbc-url=jdbc:mysql://localhost:3306/test2?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.test2.username=root
spring.datasource.test2.password=root
spring.datasource.test2.driver-class-name=com.mysql.cj.jdbc.Driver

1.3 Mapper

package com.example.mapper.test1;import com.example.enums.UserSexEnum;
import com.example.model.User;
import org.apache.ibatis.annotations.*;
import org.springframework.stereotype.Component;import java.util.List;@Component
public interface User1Mapper {@Select("SELECT * FROM users")@Results({@Result(property = "userSex",  column = "user_sex", javaType = UserSexEnum.class),@Result(property = "nickName", column = "nick_name")})List<User> getAll();@Select("SELECT * FROM users WHERE id = #{id}")@Results({@Result(property = "userSex",  column = "user_sex", javaType = UserSexEnum.class),@Result(property = "nickName", column = "nick_name")})User getOne(Long id);@Insert("INSERT INTO users(userName,passWord,user_sex) VALUES(#{userName}, #{passWord}, #{userSex})")void insert(User user);@Update("UPDATE users SET userName=#{userName},nick_name=#{nickName} WHERE id =#{id}")void update(User user);@Delete("DELETE FROM users WHERE id =#{id}")void delete(Long id);}

package com.example.mapper.test2;import java.util.List;import com.example.enums.UserSexEnum;
import com.example.model.User;
import org.apache.ibatis.annotations.*;
import org.springframework.stereotype.Component;@Component
public interface User2Mapper {@Select("SELECT * FROM users")@Results({@Result(property = "userSex",  column = "user_sex", javaType = UserSexEnum.class),@Result(property = "nickName", column = "nick_name")})List<User> getAll();@Select("SELECT * FROM users WHERE id = #{id}")@Results({@Result(property = "userSex",  column = "user_sex", javaType = UserSexEnum.class),@Result(property = "nickName", column = "nick_name")})User getOne(Long id);@Insert("INSERT INTO users(userName,passWord,user_sex) VALUES(#{userName}, #{passWord}, #{userSex})")void insert(User user);@Update("UPDATE users SET userName=#{userName},nick_name=#{nickName} WHERE id =#{id}")void update(User user);@Delete("DELETE FROM users WHERE id =#{id}")void delete(Long id);}

1.4 实体类

package com.example.model;import java.io.Serializable;import com.example.enums.UserSexEnum;public class User implements Serializable {private static final long serialVersionUID = 1L;private Long id;private String userName;private String passWord;private UserSexEnum userSex;private String nickName;public User() {super();}public User(String userName, String passWord, UserSexEnum userSex) {super();this.passWord = passWord;this.userName = userName;this.userSex = userSex;}public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassWord() {return passWord;}public void setPassWord(String passWord) {this.passWord = passWord;}public UserSexEnum getUserSex() {return userSex;}public void setUserSex(UserSexEnum userSex) {this.userSex = userSex;}public String getNickName() {return nickName;}public void setNickName(String nickName) {this.nickName = nickName;}@Overridepublic String toString() {return "userName " + this.userName + ", pasword " + this.passWord + "sex " + userSex.name();}}

package com.example.enums;public enum UserSexEnum {MAN, WOMAN
}

1.5 配置类

package com.example.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.jdbc.datasource.DataSourceTransactionManager;import javax.sql.DataSource;@Configuration
@MapperScan(basePackages = "com.example.mapper.test1", sqlSessionTemplateRef  = "test1SqlSessionTemplate")
public class DataSource1Config {@Bean(name = "test1DataSource")@ConfigurationProperties(prefix = "spring.datasource.test1")@Primarypublic DataSource testDataSource() {return DataSourceBuilder.create().build();}@Bean(name = "test1SqlSessionFactory")@Primarypublic SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource) throws Exception {SqlSessionFactoryBean bean = new SqlSessionFactoryBean();bean.setDataSource(dataSource);return bean.getObject();}@Bean(name = "test1TransactionManager")@Primarypublic DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {return new DataSourceTransactionManager(dataSource);}@Bean(name = "test1SqlSessionTemplate")@Primarypublic SqlSessionTemplate testSqlSessionTemplate(@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {return new SqlSessionTemplate(sqlSessionFactory);}}

package com.example.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.jdbc.datasource.DataSourceTransactionManager;import javax.sql.DataSource;@Configuration
@MapperScan(basePackages = "com.example.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);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);}}

1.6 启动类

package com.example;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class SpringBootMybatisAnnotationMulidatasourceApplication {public static void main(String[] args) {SpringApplication.run(SpringBootMybatisAnnotationMulidatasourceApplication.class, args);}}

1.7 控制器

package com.example.web;import java.util.List;import com.example.mapper.test1.User1Mapper;
import com.example.mapper.test2.User2Mapper;
import com.example.model.User;
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;@RestController
public class UserController {@Autowiredprivate User1Mapper user1Mapper;@Autowiredprivate User2Mapper user2Mapper;@RequestMapping("/getUsers")public List<User> getUsers() {List<User> users=user1Mapper.getAll();return users;}@RequestMapping("/getUser")public User getUser(Long id) {User user=user2Mapper.getOne(id);return user;}@RequestMapping("/add")public void save(User user) {user2Mapper.insert(user);}@RequestMapping(value="update")public void update(User user) {user2Mapper.update(user);}@RequestMapping(value="/delete/{id}")public void delete(@PathVariable("id") Long id) {user1Mapper.delete(id);}}

1.8 测试类

package com.example.mapper;import com.example.enums.UserSexEnum;
import com.example.mapper.test1.User1Mapper;
import com.example.model.User;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import java.util.List;@RunWith(SpringRunner.class)
@SpringBootTest
public class User1MapperTest {@Autowiredprivate User1Mapper userMapper;@Testpublic void testInsert() throws Exception {userMapper.insert(new User("aa", "a123456", UserSexEnum.MAN));userMapper.insert(new User("bb", "b123456", UserSexEnum.WOMAN));userMapper.insert(new User("cc", "b123456", UserSexEnum.WOMAN));// Assert.assertEquals(3, userMapper.getAll().size());}@Testpublic void testQuery() throws Exception {List<User> users = userMapper.getAll();if(users==null || users.size()==0){System.out.println("is null");}else{System.out.println(users.size());}}@Testpublic void testUpdate() throws Exception {User user = userMapper.getOne(6l);System.out.println(user.toString());user.setNickName("neo");userMapper.update(user);Assert.assertTrue(("neo".equals(userMapper.getOne(6l).getNickName())));}}

package com.example.mapper;import com.example.enums.UserSexEnum;
import com.example.mapper.test2.User2Mapper;
import com.example.model.User;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import java.util.List;@RunWith(SpringRunner.class)
@SpringBootTest
public class User2MapperTest {@Autowiredprivate User2Mapper userMapper;@Testpublic void testInsert() throws Exception {userMapper.insert(new User("aa", "a123456", UserSexEnum.MAN));userMapper.insert(new User("bb", "b123456", UserSexEnum.WOMAN));userMapper.insert(new User("cc", "b123456", UserSexEnum.WOMAN));// Assert.assertEquals(3, userMapper.getAll().size());}@Testpublic void testQuery() throws Exception {List<User> users = userMapper.getAll();if(users==null || users.size()==0){System.out.println("is null");}else{System.out.println(users.toString());}}@Testpublic void testUpdate() throws Exception {User user = userMapper.getOne(6l);System.out.println(user.toString());user.setNickName("neo");userMapper.update(user);Assert.assertTrue(("neo".equals(userMapper.getOne(6l).getNickName())));}}

2、Xml 方式

数据库文件：

DROP TABLE IF EXISTS `users`;
CREATE TABLE `users` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键id',`userName` varchar(32) DEFAULT NULL COMMENT '用户名',`passWord` varchar(32) DEFAULT NULL COMMENT '密码',`user_sex` varchar(32) DEFAULT NULL,`nick_name` varchar(32) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

2.1 pom依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.0.RELEASE</version><relativePath/></parent><groupId>com.example</groupId><artifactId>spring-boot-mybatis-xml-mulidatasource</artifactId><version>0.0.1-SNAPSHOT</version><name>spring-boot-mybatis-xml-mulidatasource</name><description>spring-boot-mybatis-xml-mulidatasource</description><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><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>2.0.0</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

2.2 配置文件

mybatis.config-location=classpath:mybatis/mybatis-config.xmlspring.datasource.test1.jdbc-url=jdbc:mysql://localhost:3306/test1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.test1.username=root
spring.datasource.test1.password=root
spring.datasource.test1.driver-class-name=com.mysql.cj.jdbc.Driverspring.datasource.test2.jdbc-url=jdbc:mysql://localhost:3306/test2?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.test2.username=root
spring.datasource.test2.password=root
spring.datasource.test2.driver-class-name=com.mysql.cj.jdbc.Driver

一个 test1 库和一个 test2 库，其中 test1 位主库，在使用的过程中必须指定主库，不然会报错。

2.3 数据源配置

package com.example.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.mapper.test1", sqlSessionTemplateRef  = "test1SqlSessionTemplate")
public class DataSource1Config {@Bean(name = "test1DataSource")@ConfigurationProperties(prefix = "spring.datasource.test1")@Primarypublic DataSource testDataSource() {return DataSourceBuilder.create().build();}@Bean(name = "test1SqlSessionFactory")@Primarypublic 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")@Primarypublic DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {return new DataSourceTransactionManager(dataSource);}@Bean(name = "test1SqlSessionTemplate")@Primarypublic SqlSessionTemplate testSqlSessionTemplate(@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {return new SqlSessionTemplate(sqlSessionFactory);}}

package com.example.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.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);}}

最关键的地方就是这块了，一层一层注入,首先创建 DataSource，然后创建 SqlSessionFactory 再创建事务，最后

包装到 SqlSessionTemplate 中。其中需要指定分库的 mapper 文件地址，以及分库dao层代码

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

这块的注解就是指明了扫描 dao 层，并且给 dao 层注入指定的 SqlSessionTemplate。所有@Bean都需要按照命

名指定正确。

2.4 dao 层和 xml层

dao 层和 xml 需要按照库来分在不同的目录，比如：test1 库 dao 层在 com.neo.mapper.test1 包下，test2 库

在com.neo.mapper.test2

package com.example.mapper.test1;import com.example.model.User;
import org.springframework.stereotype.Component;import java.util.List;@Component
public interface User1Mapper {List<User> getAll();User getOne(Long id);void insert(User user);void update(User user);void delete(Long id);}

package com.example.mapper.test2;import com.example.model.User;
import org.springframework.stereotype.Component;import java.util.List;@Component
public interface User2Mapper {List<User> getAll();User getOne(Long id);void insert(User user);void update(User user);void delete(Long id);}

xml 层

<?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.mapper.test1.User1Mapper" ><resultMap id="BaseResultMap" type="com.example.model.User" ><id column="id" property="id" jdbcType="BIGINT" /><result column="userName" property="userName" jdbcType="VARCHAR" /><result column="passWord" property="passWord" jdbcType="VARCHAR" /><result column="user_sex" property="userSex" javaType="com.example.enums.UserSexEnum"/><result column="nick_name" property="nickName" jdbcType="VARCHAR" /></resultMap><sql id="Base_Column_List" >id, userName, passWord, user_sex, nick_name</sql><select id="getAll" resultMap="BaseResultMap"  >SELECT <include refid="Base_Column_List" />FROM users</select><select id="getOne" parameterType="java.lang.Long" resultMap="BaseResultMap" >SELECT <include refid="Base_Column_List" />FROM usersWHERE id = #{id}</select><insert id="insert" parameterType="com.example.model.User" >INSERT INTO users(userName,passWord,user_sex) VALUES(#{userName}, #{passWord}, #{userSex})</insert><update id="update" parameterType="com.example.model.User" >UPDATE users SET <if test="userName != null">userName = #{userName},</if><if test="passWord != null">passWord = #{passWord},</if>nick_name = #{nickName}WHERE id = #{id}</update><delete id="delete" parameterType="java.lang.Long" >DELETE FROMusers WHERE id =#{id}</delete></mapper>

<?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.mapper.test2.User2Mapper" ><resultMap id="BaseResultMap" type="com.example.model.User" ><id column="id" property="id" jdbcType="BIGINT" /><result column="userName" property="userName" jdbcType="VARCHAR" /><result column="passWord" property="passWord" jdbcType="VARCHAR" /><result column="user_sex" property="userSex" javaType="com.example.enums.UserSexEnum"/><result column="nick_name" property="nickName" jdbcType="VARCHAR" /></resultMap><sql id="Base_Column_List" >id, userName, passWord, user_sex, nick_name</sql><select id="getAll" resultMap="BaseResultMap"  >SELECT <include refid="Base_Column_List" />FROM users</select><select id="getOne" parameterType="java.lang.Long" resultMap="BaseResultMap" >SELECT <include refid="Base_Column_List" />FROM usersWHERE id = #{id}</select><insert id="insert" parameterType="com.example.model.User" >INSERT INTO users(userName,passWord,user_sex) VALUES(#{userName}, #{passWord}, #{userSex})</insert><update id="update" parameterType="com.example.model.User" >UPDATE users SET <if test="userName != null">userName = #{userName},</if><if test="passWord != null">passWord = #{passWord},</if>nick_name = #{nickName}WHERE id = #{id}</update><delete id="delete" parameterType="java.lang.Long" >DELETE FROMusers WHERE id =#{id}</delete></mapper>

<?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><typeAliases><typeAlias alias="Integer" type="java.lang.Integer" /><typeAlias alias="Long" type="java.lang.Long" /><typeAlias alias="HashMap" type="java.util.HashMap" /><typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" /><typeAlias alias="ArrayList" type="java.util.ArrayList" /><typeAlias alias="LinkedList" type="java.util.LinkedList" /></typeAliases>
</configuration>

实体类：

package com.example.enums;public enum UserSexEnum {MAN, WOMAN
}

package com.example.model;import com.example.enums.UserSexEnum;import java.io.Serializable;public class User implements Serializable {private static final long serialVersionUID = 1L;private Long id;private String userName;private String passWord;private UserSexEnum userSex;private String nickName;public User() {super();}public User(String userName, String passWord, UserSexEnum userSex) {super();this.passWord = passWord;this.userName = userName;this.userSex = userSex;}public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassWord() {return passWord;}public void setPassWord(String passWord) {this.passWord = passWord;}public UserSexEnum getUserSex() {return userSex;}public void setUserSex(UserSexEnum userSex) {this.userSex = userSex;}public String getNickName() {return nickName;}public void setNickName(String nickName) {this.nickName = nickName;}@Overridepublic String toString() {return "userName " + this.userName + ", pasword " + this.passWord + ", sex " + userSex.name();}}

2.5 控制器

package com.example.web;import com.example.mapper.test1.User1Mapper;
import com.example.mapper.test2.User2Mapper;
import com.example.model.User;
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 java.util.List;@RestController
public class UserController {@Autowiredprivate User1Mapper user1Mapper;@Autowiredprivate User2Mapper user2Mapper;@RequestMapping("/getUsers")public List<User> getUsers() {List<User> users=user1Mapper.getAll();return users;}@RequestMapping("/getUser")public User getUser(Long id) {User user=user2Mapper.getOne(id);return user;}@RequestMapping("/add")public void save(User user) {user2Mapper.insert(user);}@RequestMapping(value="update")public void update(User user) {user2Mapper.update(user);}@RequestMapping(value="/delete/{id}")public void delete(@PathVariable("id") Long id) {user1Mapper.delete(id);}}

2.6 启动类

package com.example;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class SpringBootMybatisXmlMulidatasourceApplication {public static void main(String[] args) {SpringApplication.run(SpringBootMybatisXmlMulidatasourceApplication.class, args);}}

2.7 测试

package com.example.mapper;import com.example.enums.UserSexEnum;
import com.example.mapper.test1.User1Mapper;
import com.example.model.User;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import java.util.List;@RunWith(SpringRunner.class)
@SpringBootTest
public class User1MapperTest {@Autowiredprivate User1Mapper userMapper;@Testpublic void testInsert() throws Exception {userMapper.insert(new User("aa", "a123456", UserSexEnum.MAN));userMapper.insert(new User("bb", "b123456", UserSexEnum.WOMAN));userMapper.insert(new User("cc", "b123456", UserSexEnum.WOMAN));// Assert.assertEquals(3, userMapper.getAll().size());}@Testpublic void testQuery() throws Exception {List<User> users = userMapper.getAll();if (users == null || users.size() == 0) {System.out.println("is null");} else {System.out.println(users.size());}}@Testpublic void testUpdate() throws Exception {User user = userMapper.getOne(6l);System.out.println(user.toString());user.setNickName("neo");userMapper.update(user);Assert.assertTrue(("neo".equals(userMapper.getOne(6l).getNickName())));}}

package com.example.mapper;import com.example.enums.UserSexEnum;
import com.example.mapper.test2.User2Mapper;
import com.example.model.User;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import java.util.List;@RunWith(SpringRunner.class)
@SpringBootTest
public class User2MapperTest {@Autowiredprivate User2Mapper userMapper;@Testpublic void testInsert() throws Exception {userMapper.insert(new User("aa", "a123456", UserSexEnum.MAN));userMapper.insert(new User("bb", "b123456", UserSexEnum.WOMAN));userMapper.insert(new User("cc", "b123456", UserSexEnum.WOMAN));// Assert.assertEquals(3, userMapper.getAll().size());}@Testpublic void testQuery() throws Exception {List<User> users = userMapper.getAll();if(users==null || users.size()==0){System.out.println("is null");}else{System.out.println(users.toString());}}@Testpublic void testUpdate() throws Exception {User user = userMapper.getOne(6l);System.out.println(user.toString());user.setNickName("neo");userMapper.update(user);Assert.assertTrue(("neo".equals(userMapper.getOne(6l).getNickName())));}}