spring整合系列学习笔记——springBoot整合mybatis

三、springBoot整合mybatis逆向工程

新建springBoot工程

1.【spring-boot-mybatis】

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>

    <groupId>comgroupId>
    <artifactId>itcloudartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <packaging>jarpackaging>

    <name>itcloudname>
    <description>Demo project for Spring Bootdescription>

    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>1.5.9.RELEASEversion>
        <relativePath/> 
    parent>

    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
        <java.version>1.8java.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.bootgroupId>
            <artifactId>mybatis-spring-boot-starterartifactId>
            <version>1.3.1version>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>com.github.pagehelpergroupId>
            <artifactId>pagehelper-spring-boot-starterartifactId>
            <version>RELEASEversion>
        dependency>
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druidartifactId>
            <version>1.1.5version>
        dependency>

        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <scope>runtimescope>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>

    <build>
        <plugins>
            
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
            
            <plugin>
                <groupId>org.mybatis.generatorgroupId>
                <artifactId>mybatis-generator-maven-pluginartifactId>
                <version>1.3.5version>
                <configuration>
                    <verbose>trueverbose>
                    <overwrite>trueoverwrite>
                configuration>
            plugin>
        plugins>
    build>
project>

2.【resources/generatorConfig.xml】建立此文件，文件名必须为generatorConfig.xml

<generatorConfiguration>

    
    <classPathEntry
            location="C:\Users\DELL\.m2\repository\mysql\mysql-connector-java\5.1.40\mysql-connector-java-5.1.40.jar"/>


    
    <context id="mysql" targetRuntime="MyBatis3">
        <commentGenerator >
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        commentGenerator>
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/spring?characterEncoding=utf-8"
                        userId="root"
                        password="admin">
        jdbcConnection>

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        javaTypeResolver>
        
        <javaModelGenerator targetPackage="com.itcloud.pojo" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
            
            <property name="constructorPackages" value="true"/>
        javaModelGenerator>
        
        <sqlMapGenerator targetPackage="mybatis" targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true"/>
        sqlMapGenerator>
        
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.itcloud.mapper" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
        javaClientGenerator>
        
        <table tableName="goods" domainObjectName="Goods"
               enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
            <columnOverride column="detail" jdbcType="VARCHAR"/>
        table>
        <table tableName="orders" domainObjectName="Orders" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"/>

    context>
generatorConfiguration>

3.命令行进入目录：/spring-boot-mybatis/,执行maven命令

F:\spring-root\spring-boot-mybatis>
F:\spring-root\spring-boot-mybatis> mvn mybatis-generator:generate

4.生成反向工程的文件，文件结构如下

反向工程生成的 Mapper.java无法被springBoot自动注入，需要在类上面添加@Mapper*注解，或者在程序的主类上面进行先关包的扫描

演示：下面二者用其一即可

​ 1.@Mapper

@Mapper
public interface GoodsMapper {
   //此处内容被省略
}

​ [email protected](“com.itcloud.mapper”)

package com.itcloud;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.itcloud.mapper")
public class ItcloudApplication {

    public static void main(String[] args) {
        SpringApplication.run(ItcloudApplication.class, args);
    }
}

6.配置文件编写：【resources/application.yml】

server:
  port: 9090
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    url: jdbc:mysql://localhost:3306/spring?characterEncoding=utf-8
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: admin
#    整合mybatis
mybatis:
  type-aliases-package: com.itcloud.pojo
  mapper-locations: classpath:mybatis/*.xml

pagehelper:
  helper-dialect: mysql
  # responable进行合理化分页,如果pageNum<=0时候会查询第一页的数据。如果pageNum>总页数，会查询最后一页的数据。
  reasonable: true
  supportMethodsArguments: true
  params: count=countSql

5.springBoot测试

package com.itcloud;
import java.math.BigDecimal;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.itcloud.mapper.GoodsMapper;
import com.itcloud.pojo.Goods;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = ItcloudApplication.class)
public class ItcloudApplicationTests {

    @Autowired
    private GoodsMapper goodsMapper;
    @Test
    public void contextLoads() {
        Goods goods = goodsMapper.selectByPrimaryKey(3);
        System.out.println(goods.getDetail());//结果：一款适合所有篮球爱好者的篮球，朴素的外观不失优雅
    }
    //批量插入，可以直接在数据库中查看
    @Test
    public void insert() {
        for(int x=1 ;x<101 ;x++){
            Goods good = new Goods() ;
            good.setPrice(new BigDecimal("44.39").add(new BigDecimal(x/10)));
            good.setTitle("商品"+x);
            good.setDetail("商品"+x+",很实惠");
            goodsMapper.insert(good) ;
        }
    }
    //分页
    @Test
    public void split() {
        PageHelper.startPage(1,10) ;
        List goods = goodsMapper.selectAll();
        PageInfo pageInfo = new PageInfo(goods);
        System.out.println(pageInfo.getPages()); //结果： 11
    }
}