springboot学习-整合mybatis使用Generator自动生成代码

第零步，在pom.xml中新增加generator插件，如图：

配置代码贴出来：UTF-8UTF-81.8

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.3.2</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.0</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-core</artifactId>
        <version>1.3.5</version>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <configuration>
                <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
                <overwrite>true</overwrite>
                <verbose>true</verbose>
            </configuration>
        </plugin>
    </plugins>
</build>

第一步，编辑generator文件：

<?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>
    <!-- 数据库驱动:换成你本地的驱动包位置-->
    <classPathEntry  location="E:\mysql-connector-java-5.1.46\mysql-connector-java-5.1.46.jar"/>
    <context id="DB2Tables"  targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--数据库链接URL，用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/springboot?useSSL=false" userId="root" password="1011">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成模型的包名和位置-->
        <javaModelGenerator targetPackage="com.javazhiyin.entity" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置-->
        <sqlMapGenerator targetPackage="resources.mapper" targetProject="src/main">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.javazhiyin.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
        <table tableName="user_t" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>

此时的项目结构如图所示：

第二步，运行generator生成代码：

run-Edit Configurations-点击绿色的加号，选择maven:

填写name及运行命令mybatis-generator:generate -e：

第三步，运行generator ，生成代码：

运行结束之后，如果成功，我们可以看到按照预想已经生成了entity、dao、及Mapper映射文件。

第四步，编写controller，实现我们所需的功能：

package com.javazhiyin.controller;
import com.javazhiyin.dao.UserMapper;
import com.javazhiyin.entity.User;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
/**
Created by 57783 on 2018/7/6.
*/
@RestController
public class UserController {
@Resource
private UserMapper userMapper;
@GetMapping("/showUser/{id}")
public User getUser(@PathVariable("id") Integer id){
User user = this.userMapper.selectByPrimaryKey(id);
return user;
}
@PostMapping(value = "/addUser")
public void addUser(@RequestParam("username") String username,
@RequestParam("password") String password,
@RequestParam("age") Integer age){
User user = new User();
user.setUserName(username);
user.setPassword(password);
user.setAge(age);
userMapper.insert(user);
}
@PutMapping(value = "updUser/{id}")
public void updUser(@PathVariable("id") Integer id,
@RequestParam("username") String username,
@RequestParam("password") String password,
@RequestParam("age") Integer age){
User user = new User();
user.setId(id);
user.setUserName(username);
user.setPassword(password);
user.setAge(age);
userMapper.updateByPrimaryKey(user);
}
@DeleteMapping(value = "delUser/{id}")
public void delUser(@PathVariable("id") Integer id){
userMapper.deleteByPrimaryKey(id);
}
}

最后，我们修改Bootdemo04Application启动类，添加@MapperScan注解，使其可以扫描DAO层接口：

package com.javazhiyin;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.javazhiyin.dao")
public class Bootdemo04Application {
public static void main(String[] args) {
    SpringApplication.run(Bootdemo04Application.class, args);
}
}

只有这四个增删改查可能不会感觉多方便，如果有大量的表，省去我们编写基本的DAO、Entity及Mapper映射，回非常的nice.

注：本文转载自https://www.javazhiyin.com/,若有侵权