本篇文章为大家展示了mybatisPlus与多数据源怎么在springboot中使用,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
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');
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 plus mybatis-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: 1 server: 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 */ @Data public 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master public interface UserMapper extends BaseMapper<User> { }
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) @SpringBootTest public 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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