Springboot整合Mybatis增删改查

1，POM文件加入依赖

<dependencies>
        <!--Thymeleaf启动器-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--Mybatis启动器-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>
        <!--MySql驱动坐标-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <!--Druid数据源依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.12</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <!--配置Generator插件-->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.5</version>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.38</version>
                    </dependency>
                </dependencies>
                <!--指定配置文件的路径-->
                <configuration>
                    <configurationFile>${project.basedir}/src/main/resources/generatorConfig.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
            </plugin>
        </plugins>
        <!--配置资源拷贝插件-->
        <resources>
            <resource>
                <!--指定去哪拷贝-->
                <directory>src/main/java</directory>
                <includes>
                    <!--指定拷贝什么文件-->
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <!--当配置了src/main/java下的就不会拷贝resource下的文件了所以还需要配置一下-->
            <resource>
                <!--指定去哪拷贝-->
                <directory>src/main/resource</directory>
                <includes>
                    <!--指定拷贝什么文件-->
                    <include>**/*.yml</include>
                    <include>**/*.propreties</include>
                </includes>
            </resource>
        </resources>
    </build>

2，SpringBoot配置文件

3，配置generator

<?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>
    <!-- 数据库驱动包位置 -->
<!--    <classPathEntry location="D:\generator\mysql-connector-java-5.1.18-bin.jar" />-->
    <!--id是自己起的名字-->
    <context id="DB2Tables" targetRuntime="MyBatis3">
        <commentGenerator>
            <!--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/demo" userId="root" password="123.com">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
        <!-- 生成模型的包名和位置 -->
        <javaModelGenerator targetPackage="com.bdqn.springbootmybatis.pojo" targetProject=".\src\main\java">
            <!--enableSubPackages是否让schema作为包的后缀名-->
            <property name="enableSubPackages" value="true" />
            <!--从数据库返回的值清理前后的空格-->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- 生成的映射文件包名和位置 -->
        <sqlMapGenerator targetPackage="com.bdqn.springbootmybatis.mapper" targetProject=".\src\main\java">
            <!--enableSubPackages是否让schema作为包的后缀名-->
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.bdqn.springbootmybatis.mapper" targetProject=".\src\main\java">
            <!--enableSubPackages是否让schema作为包的后缀名-->
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>
        <!-- 要生成那些表(更改tableName和domainObjectName就可以) -->
        <table tableName="user" domainObjectName="Table1" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false" />

    </context>
</generatorConfiguration>

　　运行generator

　　　　运行后生成4个类

4，跳转页面Controller

 5，service层

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;
    @Override
    public void addUser(User user) {
        this.userMapper.insert(user);
    }

    @Override
    public List<User> showUser() {
        UserExample example=new UserExample();
        return this.userMapper.selectByExample(example);
    }

    @Override
    public User preUptateUser(int id) {
        return this.userMapper.selectByPrimaryKey(id);
    }

    @Override
    @Transactional
    public void updateUser(User user) {
        this.userMapper.updateByPrimaryKey(user);
    }

    @Override
    public void deleteUser(int id) {
        this.userMapper.deleteByPrimaryKey(id);
    }
}

6，Controller层

@Controller
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @PostMapping("/addUser")
    public String addUser(User user, Model model)
    {
        this.userService.addUser(user);
        return "redirect:/ok";
    };
    @GetMapping("/findUser")
    public String findUser(Model model)
    {
        List<User> list = userService.showUser();
        model.addAttribute("list",list);
        return "showUsers";
    };
    @GetMapping("/petUpdateUser")
    public String petUpdateUser(int id,Model model)
    {
        User user = this.userService.preUptateUser(id);
        model.addAttribute("user",user);
        return "updateUser";
    };
    @PostMapping("/updateUser")
    public String updateUser(User user)
    {
        this.userService.updateUser(user);
        return "redirect:/ok";
    };
    @GetMapping("/deleteUser")
    public String deleteUser(int id)
    {
        this.userService.deleteUser(id);
        return "redirect:/ok";
    };
}

 7，启动类加入