我们上一节给大家讲了springboot2结合mybatis实现mysql数据的增删改查，但是是要用到xml配置的，一旦涉及到xml配置，就会比较麻烦。今天再来给大家讲一个新的方法，不用设置xml文件，并且代码看起来更简洁。

一，引入mybatis和数据库连接的依赖

完整的pom.xml贴出来给大家

<?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>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.1.6.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <groupId>com.shitou</groupId>    <artifactId>mybatis</artifactId>    <version>0.0.1-SNAPSHOT</version>    <name>mybatis</name>    <description>Demo project for Spring Boot</description>    <properties>        <java.version>1.8</java.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <!--        mybatis-->        <dependency>            <groupId>org.mybatis.spring.boot</groupId>            <artifactId>mybatis-spring-boot-starter</artifactId>            <version>LATEST</version>        </dependency>        <!--        数据库链接依赖-->        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <scope>runtime</scope>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

二，配置数据库连接

这里我的数据库是用的mysql数据库，使用的是test2库。

三，建库建表

创建test2数据库

create database test2 default character set utf8 collate utf8_general_ci;

创建user2数据表

CREATE TABLE user2(    id   int(32) auto_increment   NOT NULL PRIMARY KEY,    name VARCHAR(32) comment '姓名' NOT NULL,    age  VARCHAR(32) comment '年纪' NOT NULL) COMMENT '用户表' CHARACTER SET utf8 COLLATE utf8_general_ci;

四，创建与数据表对应的实体类

五，创建操作数据库的mapper

代码给大家贴出来

@Mapperpublic interface User2Mapper {    @Insert("insert into user2(name, age) values(#{name}, #{age})")    int add(@Param("name") String name, @Param("age") int age);    @Update("update user2 set name = #{name}, age = #{age} where id = #{id}")    int update(@Param("name") String name, @Param("age") int age, @Param("id") int id);    @Delete("delete from user2 where id = #{id}")    int delete(int id);    @Select("select id, name as name, age as age from user2 where id = #{id}")    User2 findOne(@Param("id") int id);    @Select("select * from user2")    List<User2> findAll();}

六，创建service和controller

service代码如下

@Servicepublic class User2Service {    @Resource    private User2Mapper accountMapper;    public int add(String name, int age) {        return accountMapper.add(name, age);    }    public int update(String name, int age, int id) {        return accountMapper.update(name, age, id);    }    public int delete(int id) {        return accountMapper.delete(id);    }    public User2 findAccount(int id) {        return accountMapper.findOne(id);    }    public List<User2> findAccountList() {        return accountMapper.findAll();    }}

controller代码如下

@RestController@RequestMapping("/mybatis")public class User2Controller {    @Resource    User2Service accountService;    @GetMapping("/list")    public List<User2> getAccounts() {        return accountService.findAccountList();    }    @GetMapping("/findone")    public User2 getAccountById(@RequestParam("id") int id) {        return accountService.findAccount(id);    }    @GetMapping("/update")    public String updateAccount(@RequestParam("id") int id,                                @RequestParam(value = "name") String name,                                @RequestParam(value = "age") int age) {        int t = accountService.update(name, age, id);        if (t == 1) {            return "success";        } else {            return "fail";        }    }    @GetMapping("/delete")    public String delete(@RequestParam(value = "id") int id) {        int t = accountService.delete(id);        if (t == 1) {            return "success";        } else {            return "fail";        }    }    @GetMapping("/add")    public String postAccount(@RequestParam(value = "name") String name,                              @RequestParam(value = "age") int age) {        int t = accountService.add(name, age);        if (t == 1) {            return "success";        } else {            return "fail";        }    }}

七，启动项目，做验证

启动springboot项目

添加数据。如下图，我们通过add添加两个数据

通过list 查询所有数据

更新和删除数据，就不给大家演示了。

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