SpringBoots基于Mybatis注解版（无xml）简单操作mysql含分页

1. 创建数据库和表单
   我这里直接用navica建了，注意将id设为主键，并且自动递增。

2. 添加依赖

   		<dependency>
       	<groupId>org.mybatis.spring.boot</groupId>
       	<artifactId>mybatis-spring-boot-starter</artifactId>
       	<version>2.0.0</version>
   		</dependency>
   
   		<dependency>         //该插件为分页插件
       	<groupId>com.github.pagehelper</groupId>
       	<artifactId>pagehelper-spring-boot-starter</artifactId>
       	<version>1.2.5</version>
   		</dependency>
   

3. 创建实体类

   public class Student {
   
   	private int id;
   	private String name;
   	private int age;
   
   	public int getId() {    return id;    }
   
   	public void setId(int id) { this.id = id;    }
   
   	public String getName() {   return name;    }
   
   	public void setName(String name) {  this.name = name;    }
   
   	public int getAge() {   return age;    }
   
   	public void setAge(int age) {   this.age = age;    }
   
   }
   

4. 创建Mapper

   @Mapper
   	public interface studentDao {
   	@Results({ 
       	@Result(property = "id", column = "id"),
       	@Result(property = "name", column = "name"),
       	@Result(property = "age", column = "age")
   	})
   	@Select("SELECT * FROM student WHERE age = #{age}")  //输入年龄查询
   		List<Student> get(int age);
   
   	@Select("SELECT * FROM student")       //查询全部
   		Page<Student> getall();
   
   	@Insert("INSERT INTO student(name, age) VALUES (#{name}, #{age})")
   	@Options(keyProperty = "id", useGeneratedKeys = true)      //设定id为主键且自增
   		void insert(Student student);
   	}
   

5. 创建 Service类

    @Service
    	public class UserService {
    @Autowired
    	private studentDao studentDao;
   
    	public List<Student> showDao(int age) {
    		return studentDao.get(age);
    		}
    	 
    	 public List<Student> showbypage(int page,int limit) {
    		PageHelper.startPage(page,limit);        //分页核心语句
    		Page<Student> userlist = studentDao.getall();
    		return userlist;
    		}
    		
    	public String insert(String name, int age) { //插入一条记录
    		Student student = new Student();
    		student.setName(name);
    		student.setAge(age);
    		studentDao.insert(student);
    		return "Insert ( \""+name+"\", age"+age+") OK!";
    		}
    	}
   

6. Controller

    @RestController
    	public class studentController {
    @Autowired
    	private UserService userService;
   
    @PostMapping(value = "/show")
    	public Object show(@RequestParam("age") int age)
    	{
    		return userService.showDao(age);
    	}
    @PostMapping(value = "/showbypage")            //要传递2个参数，即当前页和每页显示的数据数量
    	 public Object show(@RequestParam("page") int page, @RequestParam("limit") int limit)
    {
   	 	return userService.showbypage(page,limit);
     }
   
    @PostMapping(value = "/insert")
    	public String show(@RequestParam("name") String name,@RequestParam("age") int age)
    	{
   		return userService.insert(name,age);
    	}
   
    }
   

7. 是不是很简单呢~~