站长百科 springboot学习笔记：9.springboot+mybatis+通用mapper+多数据源 正文

springboot学习笔记：9.springboot+mybatis+通用mapper+多数据源

2022-12-21,,,,

本文承接上一篇文章：springboot学习笔记：8. springboot+druid+mysql+mybatis+通用mapper+pagehelper+mybatis-generator+freemarker+layui

请确保根据上一篇文章的源代码完成所有测试之后，再跟随本文，继续配置多数据源；

1.数据库准备

数据库表我们在springboot-mybatis数据之外，新建数据库springboot-mybatis2；

springboot-mybatis数据库中有t_class表；

springboot-mybatis2数据库中有t_teacher表；

2.配置文件增加新数据源连接配置信息：

spring.datasource2.type=com.alibaba.druid.pool.DruidDataSource

spring.datasource2.driver-class-name=com.mysql.jdbc.Driver

spring.datasource2.url=jdbc:mysql://localhost:3306/springboot-mybatis2?useUnicode=true&characterEncoding=utf-8

spring.datasource2.username=root

spring.datasource2.password=root

3.注意第二个数据源DataSource2对应的数据表实体及mapper和service的包结构：

两套数据源对应的mapper、service包与第一个数据源是平行的

4.DruidConfig.java中增加新数据源：dataSource2(加粗部分)

package com.zjt.config;

import com.alibaba.druid.filter.Filter;

import com.alibaba.druid.filter.stat.StatFilter;

import com.alibaba.druid.pool.DruidDataSource;

import com.alibaba.druid.support.http.StatViewServlet;

import com.alibaba.druid.support.http.WebStatFilter;

import com.alibaba.druid.wall.WallConfig;

import com.alibaba.druid.wall.WallFilter;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.web.servlet.FilterRegistrationBean;

import org.springframework.boot.web.servlet.ServletRegistrationBean;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.Primary;

import javax.sql.DataSource;

import java.util.ArrayList;

import java.util.List;

/**

 * Druid配置

 *

 * @author zhaojiatao

 */

@Configuration

public class DruidConfig {

    private Logger logger = LoggerFactory.getLogger(DruidConfig.class);

    @Value("${spring.datasource.url:#{null}}")

    private String dbUrl;

    @Value("${spring.datasource.username: #{null}}")

    private String username;

    @Value("${spring.datasource.password:#{null}}")

    private String password;

    @Value("${spring.datasource.driverClassName:#{null}}")

    private String driverClassName;

    @Value("${spring.datasource2.url:#{null}}")

    private String dbUrl2;

    @Value("${spring.datasource2.username: #{null}}")

    private String username2;

    @Value("${spring.datasource2.password:#{null}}")

    private String password2;

    @Value("${spring.datasource2.driverClassName:#{null}}")

    private String driverClassName2;

    @Value("${spring.datasource.initialSize:#{null}}")

    private Integer initialSize;

    @Value("${spring.datasource.minIdle:#{null}}")

    private Integer minIdle;

    @Value("${spring.datasource.maxActive:#{null}}")

    private Integer maxActive;

    @Value("${spring.datasource.maxWait:#{null}}")

    private Integer maxWait;

    @Value("${spring.datasource.timeBetweenEvictionRunsMillis:#{null}}")

    private Integer timeBetweenEvictionRunsMillis;

    @Value("${spring.datasource.minEvictableIdleTimeMillis:#{null}}")

    private Integer minEvictableIdleTimeMillis;

    @Value("${spring.datasource.validationQuery:#{null}}")

    private String validationQuery;

    @Value("${spring.datasource.testWhileIdle:#{null}}")

    private Boolean testWhileIdle;

    @Value("${spring.datasource.testOnBorrow:#{null}}")

    private Boolean testOnBorrow;

    @Value("${spring.datasource.testOnReturn:#{null}}")

    private Boolean testOnReturn;

    @Value("${spring.datasource.poolPreparedStatements:#{null}}")

    private Boolean poolPreparedStatements;

    @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize:#{null}}")

    private Integer maxPoolPreparedStatementPerConnectionSize;

    @Value("${spring.datasource.filters:#{null}}")

    private String filters;

    @Value("{spring.datasource.connectionProperties:#{null}}")

    private String connectionProperties;

    @Bean

    @Primary

    public DataSource dataSource(){

        DruidDataSource datasource = new DruidDataSource();

        datasource.setUrl(this.dbUrl);

        datasource.setUsername(username);

        datasource.setPassword(password);

        datasource.setDriverClassName(driverClassName);

        //configuration

        if(initialSize != null) {

            datasource.setInitialSize(initialSize);

        }

        if(minIdle != null) {

            datasource.setMinIdle(minIdle);

        }

        if(maxActive != null) {

            datasource.setMaxActive(maxActive);

        }

        if(maxWait != null) {

            datasource.setMaxWait(maxWait);

        }

        if(timeBetweenEvictionRunsMillis != null) {

            datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);

        }

        if(minEvictableIdleTimeMillis != null) {

            datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);

        }

        if(validationQuery!=null) {

            datasource.setValidationQuery(validationQuery);

        }

        if(testWhileIdle != null) {

            datasource.setTestWhileIdle(testWhileIdle);

        }

        if(testOnBorrow != null) {

            datasource.setTestOnBorrow(testOnBorrow);

        }

        if(testOnReturn != null) {

            datasource.setTestOnReturn(testOnReturn);

        }

        if(poolPreparedStatements != null) {

            datasource.setPoolPreparedStatements(poolPreparedStatements);

        }

        if(maxPoolPreparedStatementPerConnectionSize != null) {

            datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);

        }

        if(connectionProperties != null) {

            datasource.setConnectionProperties(connectionProperties);

        }

        List<Filter> filters = new ArrayList<>();

        filters.add(statFilter());

        filters.add(wallFilter());

        datasource.setProxyFilters(filters);

        return datasource;

    }

    @Bean

    public DataSource dataSource2(){

        DruidDataSource datasource = new DruidDataSource();

        datasource.setUrl(this.dbUrl2);

        datasource.setUsername(username2);

        datasource.setPassword(password2);

        datasource.setDriverClassName(driverClassName2);

        //configuration

        if(initialSize != null) {

            datasource.setInitialSize(initialSize);

        }

        if(minIdle != null) {

            datasource.setMinIdle(minIdle);

        }

        if(maxActive != null) {

            datasource.setMaxActive(maxActive);

        }

        if(maxWait != null) {

            datasource.setMaxWait(maxWait);

        }

        if(timeBetweenEvictionRunsMillis != null) {

            datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);

        }

        if(minEvictableIdleTimeMillis != null) {

            datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);

        }

        if(validationQuery!=null) {

            datasource.setValidationQuery(validationQuery);

        }

        if(testWhileIdle != null) {

            datasource.setTestWhileIdle(testWhileIdle);

        }

        if(testOnBorrow != null) {

            datasource.setTestOnBorrow(testOnBorrow);

        }

        if(testOnReturn != null) {

            datasource.setTestOnReturn(testOnReturn);

        }

        if(poolPreparedStatements != null) {

            datasource.setPoolPreparedStatements(poolPreparedStatements);

        }

        if(maxPoolPreparedStatementPerConnectionSize != null) {

            datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);

        }

        if(connectionProperties != null) {

            datasource.setConnectionProperties(connectionProperties);

        }

        List<Filter> filters = new ArrayList<>();

        filters.add(statFilter());

        filters.add(wallFilter());

        datasource.setProxyFilters(filters);

        return datasource;

    }

    @Bean

    public ServletRegistrationBean druidServlet() {

        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");

        //控制台管理用户，加入下面2行 进入druid后台就需要登录

        //servletRegistrationBean.addInitParameter("loginUsername", "admin");

        //servletRegistrationBean.addInitParameter("loginPassword", "admin");

        return servletRegistrationBean;

    }

    @Bean

    public FilterRegistrationBean filterRegistrationBean() {

        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();

        filterRegistrationBean.setFilter(new WebStatFilter());

        filterRegistrationBean.addUrlPatterns("/*");

        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");

        filterRegistrationBean.addInitParameter("profileEnable", "true");

        return filterRegistrationBean;

    }

    @Bean

    public StatFilter statFilter(){

        StatFilter statFilter = new StatFilter();

        statFilter.setLogSlowSql(true); //slowSqlMillis用来配置SQL慢的标准，执行时间超过slowSqlMillis的就是慢。

        statFilter.setMergeSql(true); //SQL合并配置

        statFilter.setSlowSqlMillis(1000);//slowSqlMillis的缺省值为3000，也就是3秒。

        return statFilter;

    }

    @Bean

    public WallFilter wallFilter(){

        WallFilter wallFilter = new WallFilter();

        //允许执行多条SQL

        WallConfig config = new WallConfig();

        config.setMultiStatementAllow(true);

        wallFilter.setConfig(config);

        return wallFilter;

    }

}

5.增加MybatisDatasource2Config.java配置dataSource2对应的mapper扫描包路径、sqlSessionFactory2、以及事务管理器transactionManager2

package com.zjt.config;

import com.zjt.util.MyMapper;

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.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

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.core.io.support.ResourcePatternResolver;

import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

/**

 * @author <a href="zhaojiatao"></a>

 * @version 1.0, 2017/11/24

 * @description

 */

@Configuration

// 精确到 mapper 目录，以便跟其他数据源隔离

@MapperScan(basePackages = "com.zjt.mapper2", markerInterface = MyMapper.class, sqlSessionFactoryRef = "sqlSessionFactory2")

public class MybatisDatasource2Config {

    @Autowired

    @Qualifier("dataSource2")

    private DataSource ds;

    @Bean

    public SqlSessionFactory sqlSessionFactory2() throws Exception {

        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();

        factoryBean.setDataSource(ds);

        //指定mapper xml目录

        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();

        factoryBean.setMapperLocations(resolver.getResources("classpath:mapper2/*.xml"));

        return factoryBean.getObject();

    }

    @Bean

    public SqlSessionTemplate sqlSessionTemplate2() throws Exception {

        SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactory2()); // 使用上面配置的Factory

        return template;

    }

    //关于事务管理器，不管是JPA还是JDBC等都实现自接口 PlatformTransactionManager

    // 如果你添加的是 spring-boot-starter-jdbc 依赖，框架会默认注入 DataSourceTransactionManager 实例。

    //在Spring容器中，我们手工注解@Bean 将被优先加载，框架不会重新实例化其他的 PlatformTransactionManager 实现类。

    @Bean(name = "transactionManager2")

    @Primary

    public DataSourceTransactionManager masterTransactionManager() {

        //MyBatis自动参与到spring事务管理中，无需额外配置，只要org.mybatis.spring.SqlSessionFactoryBean引用的数据源

        // 与DataSourceTransactionManager引用的数据源一致即可，否则事务管理会不起作用。

        return new DataSourceTransactionManager(ds);

    }

}

6.增加TxAdvice2Interceptor.java配置datasource2数据源对应的事务配置

package com.zjt.interceptor;

import org.aspectj.lang.annotation.Aspect;

import org.springframework.aop.Advisor;

import org.springframework.aop.aspectj.AspectJExpressionPointcut;

import org.springframework.aop.support.DefaultPointcutAdvisor;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.transaction.PlatformTransactionManager;

import org.springframework.transaction.TransactionDefinition;

import org.springframework.transaction.interceptor.*;

import java.util.Collections;

import java.util.HashMap;

import java.util.Map;

/**

 * @author <a href="zhaojiatao"></a>

 * @version 1.0, 2017/11/29

 * @description

 * 注解声明式事务

 */

@Aspect

@Configuration

public class TxAdvice2Interceptor {

    private static final int TX_METHOD_TIMEOUT = 50000;//单位秒

    private static final String AOP_POINTCUT_EXPRESSION = "execution (* com.zjt.service2.*.*(..))";

    @Autowired

    @Qualifier("transactionManager2")

    private PlatformTransactionManager transactionManager;

    @Bean

    public TransactionInterceptor txAdvice2() {

        NameMatchTransactionAttributeSource source = new NameMatchTransactionAttributeSource();

         /*只读事务，不做更新操作*/

        RuleBasedTransactionAttribute readOnlyTx = new RuleBasedTransactionAttribute();

        readOnlyTx.setReadOnly(true);

        readOnlyTx.setPropagationBehavior(TransactionDefinition.PROPAGATION_NOT_SUPPORTED );

        /*当前存在事务就使用当前事务，当前不存在事务就创建一个新的事务*/

        RuleBasedTransactionAttribute requiredTx = new RuleBasedTransactionAttribute();

        requiredTx.setRollbackRules(

                Collections.singletonList(new RollbackRuleAttribute(Exception.class)));

        requiredTx.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);

        requiredTx.setTimeout(TX_METHOD_TIMEOUT);

        Map<String, TransactionAttribute> txMap = new HashMap<>();

        txMap.put("add*", requiredTx);

        txMap.put("save*", requiredTx);

        txMap.put("insert*", requiredTx);

        txMap.put("update*", requiredTx);

        txMap.put("delete*", requiredTx);

        txMap.put("get*", readOnlyTx);

        txMap.put("select*", readOnlyTx);

        txMap.put("query*", readOnlyTx);

        source.setNameMap( txMap );

    TransactionInterceptor txAdvice = new TransactionInterceptor(transactionManager, source);

        return txAdvice;

}

    @Bean

    public Advisor txAdviceAdvisor2() {

        AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();

        pointcut.setExpression(AOP_POINTCUT_EXPRESSION);

        return new DefaultPointcutAdvisor(pointcut, txAdvice2());

    }

}

7.编写TeacherController实现教师业务控制器

package com.zjt.web;

import com.zjt.entity.Teacher;

import com.zjt.model.PageRusult;

import com.zjt.model.QueryTeacherList;

import com.zjt.service2.TeacherService;

import com.zjt.util.Page;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import tk.mybatis.mapper.util.StringUtil;

import java.util.LinkedHashMap;

import java.util.List;

import java.util.Map;

@Controller

@RequestMapping("/teacher")

public class TeacherController {

    @Autowired

    @Qualifier("teacherServiceImpl")

    private TeacherService teacherService;

    @ResponseBody

    @RequestMapping("/queryTeacherList")

    public PageRusult selectByPages(Page<QueryTeacherList> page){

        List<Teacher> teacherList=teacherService.queryTeacherList(page);

        PageRusult<Teacher> pageRusult =new PageRusult<Teacher>(teacherList);

        pageRusult.setCode(0);

        return pageRusult;

    }

    @ResponseBody

    @RequestMapping("/saveOrUpdateTeacher")

    public Map<String,Object> saveOrUpdateTeacher(Teacher teacher){

        LinkedHashMap<String,Object> resultMap=new LinkedHashMap<String,Object>();

        try {

            return teacherService.saveOrUpdateTeacher(teacher);

        }catch (Exception e){

            resultMap.put("state","fail");

            resultMap.put("message","操作失败");

            return resultMap;

        }

    }

    @ResponseBody

    @RequestMapping("/deleteTeacher")

    public Map<String,Object> deleteTeacher(String id){

        LinkedHashMap<String,Object> resultMap=new LinkedHashMap<String,Object>();

        try {

            if(StringUtil.isNotEmpty(id)){

                teacherService.delete(id);

                resultMap.put("state","success");

                resultMap.put("message","删除班级成功");

                return resultMap;

            }else{

                resultMap.put("state","fail");

                resultMap.put("message","删除班级失败");

                return resultMap;

            }

        }catch (Exception e){

            resultMap.put("state","fail");

            resultMap.put("message","操作异常，删除班级失败");

            return resultMap;

        }

    }

}

8.启动项目验证：

8.1查询验证

8.2事务验证：

在TeacherServiceImpl.java的saveOrUpdateTeacher方法的更新操作(updateNotNull(teacher))后认为添加1/0，抛出运行时异常，看看是否回滚；

在TClassServiceImpl.java的saveOrUpdateTClass方法的更新操作(updateNotNull(tclass))后认为添加1/0，抛出运行时异常，看看是否回滚；

可以验证出两个数据源的事务均回滚成功，打开druid监控也可以看到两个数据源的事务均执行了回滚：

9.项目源代码：

https://github.com/zhaojiatao/springboot-zjt-chapter09-springboot-mybatis-datasources.git

 

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