springboot mybatis连接2个数据库 springboot 配置mybatis连接池

springboot整合mybatis

• 1、springboot配置数据库连接池druid
• 2、springboot整合mybatis
• 3、springboot整合pagehelper

新创建一个项目

勾选以下项

1、springboot配置数据库连接池druid

导入pom依赖

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid-spring-boot-starter</artifactId>
     <version>1.1.10</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aspects</artifactId>
</dependency>

application.yml配置

spring:
  datasource:
    #1.JDBC
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
    username: root
    password: 123
    druid:
      #2.连接池配置
      #初始化连接池的连接数量 大小，最小，最大
      initial-size: 5
      min-idle: 5
      max-active: 20
      #配置获取连接等待超时的时间
      max-wait: 60000
      #配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
      time-between-eviction-runs-millis: 60000
      # 配置一个连接在池中最小生存的时间，单位是毫秒
      min-evictable-idle-time-millis: 30000
      validation-query: SELECT 1 FROM DUAL
      test-while-idle: true
      test-on-borrow: true
      test-on-return: false
      # 是否缓存preparedStatement，也就是PSCache  官方建议MySQL下建议关闭   个人建议如果想用SQL防火墙 建议打开
      pool-prepared-statements: true
      max-pool-prepared-statement-per-connection-size: 20
      # 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
      filter:
        stat:
          merge-sql: true
          slow-sql-millis: 5000
      #3.基础监控配置
      web-stat-filter:
        enabled: true
        url-pattern: /*
        #设置不统计哪些URL
        exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
        session-stat-enable: true
        session-stat-max-count: 100
      stat-view-servlet:
        enabled: true
        url-pattern: /druid/*
        reset-enable: true
        #设置监控页面的登录名和密码
        login-username: admin
        login-password: admin
        allow: 127.0.0.1
        #deny: 192.168.1.100
server:
  port: 80
  servlet:
    context-path: /

启动SpringBoot项目访问druid， http://localhost:tomcat端口号/项目名称/druid/

我们最主要查看的是这三块

HelloController测试

package com.chen.springboot02.controller;

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

/**
 * @author嘟嘟
 */

@RestController
@RequestMapping("/demo")
public class HelloController {

    @RequestMapping("/say1")
    public String say1(){
        return "you see you,one day day";
    }

    @RequestMapping("/say2")
    public String say2(){
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "嗯哼";
    }

    @RequestMapping("/say3")
    public String say3(){
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "哼唧";
    }

}

可以看到每刷新一次就可以在这看请求次数和时间

2、springboot整合mybatis

导入相关pom依赖

替换相关版本

<!--更改springboot中的mysql版本，逆向生成不兼容高版本-->
<mysql.version>5.1.44</mysql.version>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>${mysql.version}</version>
    <scope>runtime</scope>
</dependency>

<resources>
    <!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.xml</include>
        </includes>
    </resource>
    <!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
    <resource>
        <directory>src/main/resources</directory>
        <includes>
            <include>*.properties</include>
            <include>*.xml</include>
            <include>*.yml</include>
        </includes>
    </resource>
</resources>

<plugin>
    <groupId>org.mybatis.generator</groupId>
    <artifactId>mybatis-generator-maven-plugin</artifactId>
    <version>1.3.2</version>
    <dependencies>
        <!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
    </dependencies>
    <configuration>
        <overwrite>true</overwrite>
    </configuration>
</plugin>

逆向生成配置文件generatorConfig.xml
当然相关的jdbc.properties文件也需要

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
<generatorConfiguration>
    <!-- 引入配置文件 -->
    <properties resource="jdbc.properties"/>

    <!--指定数据库jdbc驱动jar包的位置-->
    <classPathEntry location="D:\\deploy\\maven_repository\\mysql\\mysql-connector-java\\5.1.44\\mysql-connector-java-5.1.44.jar"/>

    <!-- 一个数据库一个context -->
    <context id="infoGuardian">
        <!-- 注释 -->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/><!-- 是否取消注释 -->
            <property name="suppressDate" value="true"/> <!-- 是否生成注释代时间戳 -->
        </commentGenerator>

        <!-- jdbc连接 -->
        <jdbcConnection driverClass="${jdbc.driver}"
                        connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/>

        <!-- 类型转换 -->
        <javaTypeResolver>
            <!-- 是否使用bigDecimal， false可自动转化以下类型（Long, Integer, Short, etc.） -->
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- 01 指定javaBean生成的位置 -->
        <!-- targetPackage：指定生成的model生成所在的包名 -->
        <!-- targetProject：指定在该项目下所在的路径  -->
        <javaModelGenerator targetPackage="com.chen.springboot02.entity"
                            targetProject="src/main/java">
            <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="false"/>
            <!-- 是否对model添加构造函数 -->
            <property name="constructorBased" value="true"/>
            <!-- 是否针对string类型的字段在set的时候进行trim调用 -->
            <property name="trimStrings" value="false"/>
            <!-- 建立的Model对象是否 不可改变  即生成的Model对象不会有 setter方法，只有构造方法 -->
            <property name="immutable" value="false"/>
        </javaModelGenerator>

        <!-- 02 指定sql映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="com.chen.springboot02.mapper"
                         targetProject="src/main/java">
            <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!-- 03 生成XxxMapper接口 -->
        <!-- type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象 -->
        <!-- type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象 -->
        <!-- type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口 -->
        <javaClientGenerator targetPackage="com.chen.springboot02.mapper"
                             targetProject="src/main/java" type="XMLMAPPER">
            <!-- 是否在当前路径下新加一层schema,false路径com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] -->
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>

        <!-- 配置表信息 -->
        <!-- schema即为数据库名 -->
        <!-- tableName为对应的数据库表 -->
        <!-- domainObjectName是要生成的实体类 -->
        <!-- enable*ByExample是否生成 example类 -->

        <table schema="" tableName="t_mvc_book" domainObjectName="Book"
               enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
            <property name="useActualColumnNames" value="true" />
        </table>


    </context>
</generatorConfiguration>

逆向生成集成到maven中的命令

mybatis-generator:generate -e

然后我们还需要再启动类中添加注解，自动扫描Mapper包
@MapperScan(“com.xy.springboot02.mapper”)
启用事物管理器
@EnableTransactionManagement
启用动态代理
@EnableAspectJAutoProxy

测试类进行测试

package com.chen.springboot02;

import com.chen.springboot02.entity.Book;
import com.chen.springboot02.service.BookService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@SpringBootTest
class Springboot02ApplicationTests {
    @Autowired
    private BookService bookService;

    @Test
    public void deleteByPrimaryKey(){
        bookService.deleteByPrimaryKey(13);
    }

    @Test
    public void selectByPrimaryKey(){
        Book book = bookService.selectByPrimaryKey(13);
        System.out.println(book);
    }

  
}

3、springboot整合pagehelper

导入相关依赖

<dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
</dependency>

配置application.yml文件

#pagehelper分页插件配置
pagehelper:
  helperDialect: mysql
  reasonable: true
  supportMethodsArguments: true
  params: count=countSql

#显示日志
logging:
  level:
    com.javaxl.springboot02.mapper: debug

在mapper.java加入

List<Map> bookPager(Map map);

mapper.xml

<select id="bookPager" resultType="java.util.Map" parameterType="java.util.Map">
    select * from t_mvc_book
    <where>
      <if test="bname !=null">
        and bname like concat ('%',#{bname},'%')
      </if>
    </where>
  </select>

加入分页切面工具类

package com.chen.springboot02.aspect;

import com.chen.springboot02.util.PageBean;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

import java.util.List;

/**
 * @author嘟嘟
 *
 * 处理* *..*Service.*Pager这个方法，只要调用这个方法，就能够达到分页的效果
 *
 * PageHelper.start();
 * 调用目标方法之前
 * 处理结果集
 *
 * .*Pager(map,pageBean)
 * *Pager(map,bname)
 */


@Component
@Aspect

public class PagerAspect {
    @Around("execution(* * ..*Service.*Pager(..))")
    public Object invoke(ProceedingJoinPoint args) throws Throwable{
        //判断符合条件的方法中是否包含pageBean参数
        Object [] params= args.getArgs();
        PageBean pageBean = null;
        for (Object param : params){
            if (param instanceof PageBean){
                pageBean =(PageBean) param;
                break;
            }
        }

        if (pageBean!=null && pageBean.isPagination()){
            PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
        }
        Object list = args.proceed(params);
        if (pageBean!=null && pageBean.isPagination()){
            PageInfo pageInfo = new PageInfo((List)list);
            pageBean.setTotal(pageInfo.getTotal()+"");
        }

        return list;
    }
}

进行测试

@Test
    public void bookPager(){
        Map map = new HashMap();
        map.put("bname","圣墟");
        PageBean pageBean = new PageBean();
        pageBean.setPage(2);

        List<Map> list = bookService.bookPager(map, pageBean);
        for(Map m:list){
            System.out.println(m);
        }

        System.out.println(pageBean);
    }