搭建spingboot而且使用通用mapper進行簡單查詢

1　　porm.xml

<?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>cn.itcast.springboot111602</groupId>
    <artifactId>springboot111602</artifactId>
    <version>1.0.0-SNAPSHOT</version>


    <!-- 全部的springboot的工程都以spring父工程爲父工程 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencies>
        <!--web啓動器-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--jdbc的啓動器，默認使用HikariCP鏈接池-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <!--不要忘記數據庫驅動，由於springboot不知道咱們使用的什麼數據庫，這裏選擇mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--mybatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- 通用mapper -->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.0.2</version>
        </dependency>
    </dependencies>
</project>

2　　application.properties

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mybatis
spring.datasource.username=root
spring.datasource.password=123456


# mybatis 別名掃描
mybatis.type-aliases-package=cn.itcast.pojo
# mapper.xml文件位置,若是沒有映射文件，請註釋掉
#mybatis.mapper-locations=classpath:mappers/*.xml


由於在啓動器中已經添加了mysql的驅動,所以在配置文件中無需再配

3　　如下按順序分別是 controller service 通用mapper pojo實體類
　　

@RestController
@RequestMapping("user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("{id}")
    public User queryUserById(@PathVariable("id")Long id){
        return this.userService.queryById(id);
    }

}

@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    public User queryById(Long id){
        return (User) this.userMapper.selectByPrimaryKey(id);
    }

    @Transactional
    public void deleteById(Long id){
        this.userMapper.deleteByPrimaryKey(id);
    }
}

通用mapper

@Mapper
public interface UserMapper extends tk.mybatis.mapper.common.Mapper {

}


實體類

package cn.itcast.pojo;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.Table;import java.util.Date;@Table(name = "tb_user")public class User {    @Id    @GeneratedValue(strategy = GenerationType.IDENTITY)    private Long id;    private String userName;    private String password;    private String name;    private Integer age;    private Integer sex;    private Date birthday;    private Date created;    private Date updated;    public Long getId() {        return id;    }    public void setId(Long id) {        this.id = id;    }    public String getUserName() {        return userName;    }    public void setUserName(String userName) {        this.userName = userName;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        this.age = age;    }    public Integer getSex() {        return sex;    }    public void setSex(Integer sex) {        this.sex = sex;    }    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }    public Date getCreated() {        return created;    }    public void setCreated(Date created) {        this.created = created;    }    public Date getUpdated() {        return updated;    }    public void setUpdated(Date updated) {        this.updated = updated;    }    @Override    public String toString() {        return "User{" +                "id=" + id +                ", userName='" + userName + '\'' +                ", password='" + password + '\'' +                ", name='" + name + '\'' +                ", age=" + age +                ", sex=" + sex +                ", birthday=" + birthday +                ", created=" + created +                ", updated=" + updated +                '}';    }}