springboot集成mybatisPlus+多数据源的实现示例

该项目主要实现mybatisplus、多数据源、lombok、druid的集成

主要参考 https://mp.baomidou.com/guide/quick-start.html项目地址：https://github.com/Blankwhiter/mybatisplus-springboot release1.0

项目结构：

CREATE TABLE user(id VARCHAR(32) NOT NULL COMMENT ’主键ID’,name VARCHAR(30) NULL DEFAULT NULL COMMENT ’姓名’,age INT(11) NULL DEFAULT NULL COMMENT ’年龄’,email VARCHAR(50) NULL DEFAULT NULL COMMENT ’邮箱’,PRIMARY KEY (id));INSERT INTO user (id, name, age, email) VALUES(1, ’Jone’, 18, ’test1@baomidou.com’),(2, ’Jack’, 20, ’test2@baomidou.com’),(3, ’Tom’, 28, ’test3@baomidou.com’),(4, ’Sandy’, 21, ’test4@baomidou.com’),(5, ’Billie’, 24, ’test5@baomidou.com’);二、引入项目依赖，加入配置，修改启动类，编写实体类和mapper对象（读者可以根据自动生成工具生成这块代码）

1.引入依赖

pom.xml

<?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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.4.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>mybatisplus-springboot</artifactId> <version>0.0.1-SNAPSHOT</version> <name>mybatisplus-springboot</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <mysql.version>6.0.6</mysql.version> <mybatisplus.boot.version>3.1.0</mybatisplus.boot.version> <druid.version>1.1.10</druid.version> <dynamic.datasource.boot.version>2.5.4</dynamic.datasource.boot.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>${mybatisplus.boot.version}</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>${druid.version}</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>dynamic-datasource-spring-boot-starter</artifactId> <version>${dynamic.datasource.boot.version}</version> </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.编写配置

application.yml

spring: autoconfigure: exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure # 为了某些版本的springboot @SpringBootApplication(exclude= {DataSourceAutoConfiguration.class}) 无法生效 datasource: dynamic: primary: master #设置默认的数据源或者数据源组,默认值即为master，如果读者只是单数据源只需要注释掉slave相关配置即可，这里为了方便演示master与slave保持相同 datasource: master: url: jdbc:mysql://localhost:3306/test?serverTimezone=Hongkong&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false # serverTimezone=Hongkong 需要填上时区 username: root password: 111111 driverClassName: com.mysql.cj.jdbc.Driver slave: url: jdbc:mysql://localhost:3306/test?serverTimezone=Hongkong&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false # serverTimezone=Hongkong 需要填上时区 username: root password: 111111 driverClassName: com.mysql.cj.jdbc.Driver initial-size: 10 # 以下是连接池配置 max-active: 100 min-idle: 10 max-wait: 60000 pool-prepared-statements: true max-pool-prepared-statement-per-connection-size: 20 time-between-eviction-runs-millis: 60000 min-evictable-idle-time-millis: 300000 #validation-query: SELECT 1 test-while-idle: true test-on-borrow: false test-on-return: false stat-view-servlet: enabled: true url-pattern: /druid/* login-username: druid login-password: 123456 filter: stat: log-slow-sql: true slow-sql-millis: 1000 merge-sql: false wall: config: multi-statement-allow: true#mybatis plusmybatis-plus: mapper-locations: classpath:mapper/**/*.xml #实体扫描，多个package用逗号或者分号分隔 typeAliasesPackage: com.example.mybatisplus.entity check-config-location: true configuration: #是否开启自动驼峰命名规则（camel case）映射 map-underscore-to-camel-case: true #全局地开启或关闭配置文件中的所有映射器已经配置的任何缓存 cache-enabled: false call-setters-on-nulls: true #配置JdbcTypeForNull, oracle数据库必须配置 jdbc-type-for-null: ’null’ #MyBatis 自动映射时未知列或未知属性处理策略 NONE：不做任何处理 (默认值), WARNING：以日志的形式打印相关警告信息, FAILING：当作映射失败处理，并抛出异常和详细信息 auto-mapping-unknown-column-behavior: warning global-config: banner: false db-config: #主键类型 0:'数据库ID自增', 1:'未设置主键类型',2:'用户输入ID (该类型可以通过自己注册自动填充插件进行填充)', 3:'全局唯一ID (idWorker), 4:全局唯一ID (UUID), 5:字符串全局唯一ID (idWorker 的字符串表示)'; id-type: UUID #字段验证策略 IGNORED:'忽略判断', NOT_NULL:'非NULL判断', NOT_EMPTY:'非空判断', DEFAULT 默认的,一般只用于注解里(1. 在全局里代表 NOT_NULL,2. 在注解里代表 跟随全局) field-strategy: NOT_EMPTY #数据库大写下划线转换 capital-mode: true #逻辑删除值 logic-delete-value: 0 #逻辑未删除值 logic-not-delete-value: 1server: port: 7000

3.修改启动类

MybatisplusSpringbootApplication.java

import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class}) //去掉springboot 默认的数据源配置@MapperScan('com.example.mybatisplus.mapper') //扫描mapper的包，或者读者可以在对应的mapper上加上@Mapper的注解public class MybatisplusSpringbootApplication { public static void main(String[] args) { SpringApplication.run(MybatisplusSpringbootApplication.class, args); }}

4.编写实体

4.1 user.java

import lombok.Data;/** * user 实体类 */@Datapublic class User { private String id; private String name; private Integer age; private String email;}

注：读者请自行在开发工具安装lombok插件，或者去掉@data注解换成setter getter方法即可

4.2 UserMapper.java

import com.baomidou.dynamic.datasource.annotation.DS;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import com.example.mybatisplus.entity.User;/** * 用户mapper */@DS('slave') //这里是配置数据源注解，默认是masterpublic interface UserMapper extends BaseMapper<User> {}三、编写测试用例

import com.example.mybatisplus.entity.User;import com.example.mybatisplus.mapper.UserMapper;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;/** * 简单的测试增删改查 */@RunWith(SpringRunner.class)@SpringBootTestpublic class MybatisplusSpringbootApplicationTests { @Autowired private UserMapper userMapper; @Test public void addUser() { User user = new User(); user.setAge(200); user.setEmail('belonghuang@outlook.com'); user.setName('belongHuang'); userMapper.insert(user); } @Test public void updateUser() { User user = userMapper.selectById(1); user.setAge(300); int i = userMapper.updateById(user); if (i>0) { System.out.println('修改成功'); }else { System.out.println('修改失败'); } } @Test public void deleteUser() { int i = userMapper.deleteById(1); if (i>0) { System.out.println('删除成功'); }else { System.out.println('删除失败'); } } @Test public void selectUser() { List<User> users = userMapper.selectList(null); users.stream().map(User::getName).forEach(System.out::println);//打印出所用用户名字 }}

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