springboot+mybatis+通用mapper+多数据源(转载)

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

 转载地址：https://www.cnblogs.com/zhaojiatao/p/8393398.html