springboot學習筆記：9.springboot+mybatis+通用mapper+多數據源 springboot學習筆記：8. springboot+druid+mysql+mybatis+通

時間 2019-12-08

標籤 springboot 學習筆記 9.springboot+mybatis mybatis 通用 mapper 數據 springboot+druid+mysql+mybatis druid mysql 欄目 Spring 简体版

原文原文鏈接

本文承接上一篇文章：springboot學習筆記：8. springboot+druid+mysql+mybatis+通用mapper+pagehelper+mybatis-generator+freemarker+layuicss

請確保根據上一篇文章的源代碼完成全部測試以後，再跟隨本文，繼續配置多數據源；html

1.數據庫準備

數據庫表咱們在springboot-mybatis數據以外，新建數據庫springboot-mybatis2；java

springboot-mybatis數據庫中有t_class表；mysql

springboot-mybatis2數據庫中有t_teacher表；git

2.配置文件增長新數據源鏈接配置信息：

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.注意第二個數據源DataSource2對應的數據表實體及mapper和service的包結構：

兩套數據源對應的mapper、service包與第一個數據源是平行的github

4.DruidConfig.java中增長新數據源：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/*");

        //控制檯管理用戶，加入下面2行 進入druid後臺就須要登陸
        //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用來配置SQL慢的標準，執行時間超過slowSqlMillis的就是慢。
        statFilter.setMergeSql(true); //SQL合併配置
        statFilter.setSlowSqlMillis(1000);//slowSqlMillis的缺省值爲3000，也就是3秒。
        return statFilter;
    }

    @Bean
    public WallFilter wallFilter(){
        WallFilter wallFilter = new WallFilter();
        //容許執行多條SQL
        WallConfig config = new WallConfig();
        config.setMultiStatementAllow(true);
        wallFilter.setConfig(config);
        return wallFilter;
    }
}

5.增長MybatisDatasource2Config.java配置dataSource2對應的mapper掃描包路徑、sqlSessionFactory二、以及事務管理器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
// 精確到 mapper 目錄，以便跟其餘數據源隔離
@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目錄
        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;
    }

    //關於事務管理器，無論是JPA仍是JDBC等都實現自接口 PlatformTransactionManager
    // 若是你添加的是 spring-boot-starter-jdbc 依賴，框架會默認注入 DataSourceTransactionManager 實例。
    //在Spring容器中，咱們手工註解@Bean 將被優先加載，框架不會從新實例化其餘的 PlatformTransactionManager 實現類。
    @Bean(name = "transactionManager2")
    @Primary
    public DataSourceTransactionManager masterTransactionManager() {
        //MyBatis自動參與到spring事務管理中，無需額外配置，只要org.mybatis.spring.SqlSessionFactoryBean引用的數據源
        // 與DataSourceTransactionManager引用的數據源一致便可，不然事務管理會不起做用。
        return new DataSourceTransactionManager(ds);
    }

}

6.增長TxAdvice2Interceptor.java配置datasource2數據源對應的事務配置

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
 * 註解聲明式事務
 */
@Aspect
@Configuration
public class TxAdvice2Interceptor {
    private static final int TX_METHOD_TIMEOUT = 50000;//單位秒
    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();
         /*只讀事務，不作更新操做*/
        RuleBasedTransactionAttribute readOnlyTx = new RuleBasedTransactionAttribute();
        readOnlyTx.setReadOnly(true);
        readOnlyTx.setPropagationBehavior(TransactionDefinition.PROPAGATION_NOT_SUPPORTED );
        /*當前存在事務就使用當前事務，當前不存在事務就建立一個新的事務*/
        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.編寫TeacherController實現教師業務控制器

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","操做失敗");
            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","刪除班級成功");
                return resultMap;
            }else{
                resultMap.put("state","fail");
                resultMap.put("message","刪除班級失敗");
                return resultMap;
            }
        }catch (Exception e){
            resultMap.put("state","fail");
            resultMap.put("message","操做異常，刪除班級失敗");
            return resultMap;
        }
    }



}