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三、springBoot整合mybatis逆向工程
新建springBoot工程
1.【spring-boot-mybatis】
<?xml version="1.0" encoding="UTF-8"?>
<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>4.0.0</modelVersion>
<groupId>com</groupId>
<artifactId>itcloud</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>itcloud</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>RELEASE</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<!--打包插件-->
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<!-- 反向工程插件 -->
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.5</version>
<configuration>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>
</project>
2.【resources/generatorConfig.xml】建立此文件，文件名必须为generatorConfig.xml
<?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">
<!--
配置文件需要注意的地方：因为是maven插件，所以必须使用generatorConfig.xml文件作为文件的名称
-->
<generatorConfiguration>
<!--定义mysql驱动jar的位置,绝对路径-->
<classPathEntry
location="C:\Users\DELL\.m2\repository\mysql\mysql-connector-java\5.1.40\mysql-connector-java-5.1.40.jar"/>
<!--数据库连接-->
<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>
<!--实体类生成策略-->
<javaModelGenerator targetPackage="com.itcloud.pojo" targetProject=".\src\main\java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
<!--是否添加构造函数-->
<property name="constructorPackages" value="true"/>
</javaModelGenerator>
<!--*Mapper.xml文件生成策略-->
<sqlMapGenerator targetPackage="mybatis" targetProject=".\src\main\resources">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!--dao层生成策略，*Mapper.java生成策略-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.itcloud.mapper" targetProject=".\src\main\java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!--此处不生成example的目的是不想用自动生成的example，因为这完全可以自己来控制sql语句，会让程序显得更加简单
-->
<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:generate4.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=countSql5.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> goods = goodsMapper.selectAll();
PageInfo pageInfo = new PageInfo(goods);
System.out.println(pageInfo.getPages()); //结果： 11
}
}