前段时间写了一篇基于mybatis实现的多数据源博客。感觉不是很好,这次打算加入git,来搭建一个基于Mybatis-Plus的多数据源项目
Mybatis-Plus就是香
前言:该项目分为master数据源与local数据源。假定master数据源为线上数据库,local为本地数据库。后续我们将通过xxl-job的方式,将线上(master)中的数据同步到本地(local)中
项目git地址 抽时间把项目提交到git仓库,方便大家直接克隆
sql文件已置于项目中,数据库使用的mysql
创建项目
我这里使用的idea,正常创建spring boot项目就行了。
sql
-- 创建master数据库 CREATE DATABASE db_master; USE db_master; -- 用户表 CREATE TABLE users( id INT PRIMARY KEY AUTO_INCREMENT COMMENT '主键id', username VARCHAR(20) NOT NULL COMMENT '用户名', pwd VARCHAR(50) NOT NULL COMMENT '密码', phone CHAR(11) NOT NULL COMMENT '手机号', email VARCHAR(50) COMMENT '邮箱', gender CHAR(1) COMMENT '性别 1-->男 0-->女', age INT COMMENT '年龄', created_time TIMESTAMP NULL DEFAULT NULL COMMENT '创建时间', updated_time TIMESTAMP NULL DEFAULT NULL COMMENT '修改时间', deleted_time TIMESTAMP NULL DEFAULT NULL COMMENT '删除时间', type INT DEFAULT 1 COMMENT '状态 1-->启用 2-->禁用 3-->软删除' )ENGINE=INNODB; INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('supperAdmin','admin123','13000000000','super@admin.com',1,20); INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('admin','admin','13200840033','admin@163.com',0,14); INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('wanggang','wanggang','13880443322','wang@gang.cn',1,36); INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('xiaobao','xiaobao','18736450102','xiao@bao.com',0,22); INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('zhaoxing','zhaoxing','18966004400','zhao@xing.com',1,29); INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('chenyun','chenyun','13987613540','chen@yun.com',1,25); INSERT INTO users(username,pwd,phone,email,gender,age) VALUES('ouyangruixue','ouyangruixue','15344773322','ouyang@163.com',0,24); -- 创建local数据库 CREATE DATABASE db_local; USE db_local; -- 本地库用户表 CREATE TABLE users( id INT PRIMARY KEY AUTO_INCREMENT COMMENT '主键id', username VARCHAR(20) NOT NULL COMMENT '用户名', pwd VARCHAR(50) NOT NULL COMMENT '密码', phone CHAR(11) NOT NULL COMMENT '手机号', email VARCHAR(50) COMMENT '邮箱', gender CHAR(1) COMMENT '性别 1-->男 0-->女', age INT COMMENT '年龄', created_time TIMESTAMP NULL DEFAULT NULL COMMENT '创建时间', updated_time TIMESTAMP NULL DEFAULT NULL COMMENT '修改时间', deleted_time TIMESTAMP NULL DEFAULT NULL COMMENT '删除时间', type INT DEFAULT 1 COMMENT '状态 1-->启用 2-->禁用 3-->软删除' )ENGINE=INNODB; -- 本地库测试表 CREATE TABLE local_test( id INT PRIMARY KEY AUTO_INCREMENT, str VARCHAR(20) )ENGINE=INNODB; INSERT INTO local_test(str) VALUES ('Hello'); INSERT INTO local_test(str) VALUES ('World'); INSERT INTO local_test(str) VALUES ('Mysql'); INSERT INTO local_test(str) VALUES ('^.^');
pom文件
目前只引入了lombok、mybatis-plus、mysql相关的依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- lombok --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <!-- Mybatis-Plus --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.2.0</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency>
application.yml
properties删除,yml创建。其实无所谓yml还是properties
server: port: 8001 spring: datasource: master: url: jdbc:mysql://localhost:3306/db_master?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai&allowMultiQueries=true username: root password: 123456 driver-class-name: com.mysql.cj.jdbc.Driver local: url: jdbc:mysql://localhost:3306/db_local?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai&allowMultiQueries=true username: root password: 123456 driver-class-name: com.mysql.cj.jdbc.Driver mybatis-plus: mapper-locations: classpath:mappers/*/*Mapper.xml #实体扫描,多个package用逗号或者分号分隔 typeAliasesPackage: com.niuniu.sys.module 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: auto #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 pagehelper: #pagehelper分页插件 helperDialect: mysql #设置数据库方言 reasonable: true supportMethodsArguments: true params: count=countSql
目录结构
由于该项目分为两个数据源。在各个分层中,你将分别见到master、local。
备注:由于users表在两个数据源中完全相同,将Users实体置于model层公用
关键代码
在config包中,我们需要对master、local的数据源进行配置,使其可以通过不同的请求,自动切换数据源
另外 由于该项目使用mybatis-plus,在创建SqlSessionFactory的时候,请使用MybatisSqlSessionFactoryBean进行bean对象的创建
local数据源
package com.demo.config; import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean; import com.zaxxer.hikari.HikariDataSource; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionTemplate; import org.mybatis.spring.annotation.MapperScan; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.jdbc.datasource.DataSourceTransactionManager; import javax.sql.DataSource; @Configuration @MapperScan(basePackages = "com.demo.dao.local", sqlSessionFactoryRef = "localSqlSessionFactory") public class LocalDataSourceConfig { @Value("${spring.datasource.local.driver-class-name}") private String driverClassName; @Value("${spring.datasource.local.url}") private String url; @Value("${spring.datasource.local.username}") private String username; @Value("${spring.datasource.local.password}") private String password; @Bean(name = "localDataSource") public DataSource localDataSource() { HikariDataSource dataSource = new HikariDataSource(); dataSource.setUsername(username); dataSource.setPassword(password); dataSource.setJdbcUrl(url); dataSource.setDriverClassName(driverClassName); dataSource.setMaximumPoolSize(10); dataSource.setMinimumIdle(5); dataSource.setPoolName("localDataSourcePool"); return dataSource; } /** * local数据源 */ @Bean(name = "localSqlSessionFactory") public SqlSessionFactory sqlSessionFactory(@Qualifier("localDataSource") DataSource dataSource) throws Exception { MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean(); bean.setDataSource(dataSource); // 设置Mybatis全局配置路径 bean.setConfigLocation(new ClassPathResource("mybatis-config.xml")); bean.setMapperLocations( new PathMatchingResourcePatternResolver().getResources("classpath*:mappers/local/*.xml")); return bean.getObject(); } @Bean(name = "localTransactionManager") public DataSourceTransactionManager transactionManager(@Qualifier("localDataSource") DataSource dataSource) { return new DataSourceTransactionManager(dataSource); } @Bean(name = "localSqlSessionTemplate") public SqlSessionTemplate testSqlSessionTemplate( @Qualifier("localSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception { return new SqlSessionTemplate(sqlSessionFactory); } }
master数据源
package com.demo.config; import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean; import com.zaxxer.hikari.HikariDataSource; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionTemplate; import org.mybatis.spring.annotation.MapperScan; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Primary; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.jdbc.datasource.DataSourceTransactionManager; import javax.sql.DataSource; @Configuration @MapperScan(basePackages = "com.demo.dao.master", sqlSessionFactoryRef = "masterSqlSessionFactory") public class MasterDataSourceConfig { @Value("${spring.datasource.master.driver-class-name}") private String driverClassName; @Value("${spring.datasource.master.url}") private String url; @Value("${spring.datasource.master.username}") private String username; @Value("${spring.datasource.master.password}") private String password; @Bean(name = "masterDataSource") @Primary public DataSource masterDataSource() { HikariDataSource dataSource = new HikariDataSource(); dataSource.setUsername(username); dataSource.setPassword(password); dataSource.setJdbcUrl(url); dataSource.setDriverClassName(driverClassName); dataSource.setMaximumPoolSize(10); dataSource.setMinimumIdle(5); dataSource.setPoolName("masterDataSource"); return dataSource; } /** * master数据源 */ @Bean(name = "masterSqlSessionFactory") @Primary public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception { MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean(); bean.setDataSource(dataSource); bean.setConfigLocation(new ClassPathResource("mybatis-config.xml")); bean.setMapperLocations( new PathMatchingResourcePatternResolver().getResources("classpath*:mappers/master/*.xml")); return bean.getObject(); } @Bean(name = "masterTransactionManager") @Primary public DataSourceTransactionManager transactionManager(@Qualifier("masterDataSource") DataSource dataSource) { return new DataSourceTransactionManager(dataSource); } @Bean(name = "masterSqlSessionTemplate") @Primary public SqlSessionTemplate testSqlSessionTemplate( @Qualifier("masterSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception { return new SqlSessionTemplate(sqlSessionFactory); } }
部分代码
Users实体类
package com.demo.model; import lombok.Data; import java.util.Date; @Data public class Users { private Integer id; private String username; private String pwd; private String phone; private String email; private Integer gender; private Integer age; private Date created_time; private Date updated_time; private Date deleted_time; private Integer type; }
UsersMapper
package com.demo.dao.master; import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.demo.model.Users; import org.apache.ibatis.annotations.Mapper; @Mapper public interface UsersMapper extends BaseMapper<Users> { }
UsersService
package com.demo.service.master; import com.baomidou.mybatisplus.extension.service.IService; import com.demo.model.Users; public interface UsersService extends IService<Users> { }
UsersServiceImpl
package com.demo.service.master.impl; import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl; import com.demo.dao.master.UsersMapper; import com.demo.model.Users; import com.demo.service.master.UsersService; import org.springframework.stereotype.Service; @Service public class UsersServiceImpl extends ServiceImpl<UsersMapper, Users> implements UsersService { }
UsersController
package com.demo.controller.master; import com.demo.model.Users; import com.demo.service.master.UsersService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.List; @RestController @RequestMapping("/master") public class UsersController { @Autowired private UsersService userssService; @RequestMapping("/users") public List<Users> list() { return userssService.list(); } }
最终的项目结构
运行结果
至此Spring Boot + Mybatis-Plus已经完成了多数据源的实现。
最后再写一点我遇到的坑吧
1、master与local中不要出现同名的文件
2、数据源配置中SqlSessionFactoryBean替换为MybatisSqlSessionFactoryBean
下一篇将会围绕xxl-job任务调度中心,介绍如何通过xxl-job实现本地库与线上库的定时同步
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