Java SSM框架之MyBatis3（六）MyBatis之参数传递

一、单个参数

 StudentParamsMapper

package cn.cnki.ref.mapper;

import cn.cnki.ref.pojo.Student;

public interface  StudentParamsMapper {
    /**
     * 根据name查询
     * @param name
     * @return
     */
    public Student getByName(String name);
}

StudentParamsMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="cn.cnki.ref.mapper.StudentParamsMapper">

    <!-- 根据用户名和id同时查询 -->
    <select id="getStudentByIdAndName" resultType="cn.cnki.ref.pojo.Student">
      select * from student where  id=#{param1}  and  name=#{param2}
    </select>

</mapper>

StudentParamsController

package cn.cnki.ref.controller;

import cn.cnki.ref.mapper.StudentParamsMapper;
import cn.cnki.ref.pojo.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

public interface StudentParamsController {
    @RestController
    public class StudentParamsMapper {
        @Autowired
        private cn.cnki.ref.mapper.StudentParamsMapper StudentParamsMapper;
        @GetMapping("/studentparams/{name}")
        public Student selectCourseById(@PathVariable("name") String name) {
            Student student = StudentParamsMapper.getByName(name);
            return student;
        }
    }
}

 测试

http://localhost:8080/studentparams/王五

二、多个参数

1.根据参数key值获取，获取规则为param1，param2，param3.........：

StudentParamsMapper

package cn.cnki.ref.mapper;

import cn.cnki.ref.pojo.Student;

public interface  StudentParamsMapper {
    /**
     * 根据用户名和id同时查询
     * @param id
     * @param name
     * @return
     */
    public Student getStudentByIdAndName(Integer id,String name);
}

StudentParamsMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="cn.cnki.ref.mapper.StudentParamsMapper">

    <!-- 根据用户名和id同时查询 -->
    <select id="getStudentByIdAndName" resultType="cn.cnki.ref.pojo.Student">
    select * from student where  id=#{0}  and  name=#{1}
    </select>

</mapper>

StudentParamsController

package cn.cnki.ref.controller;

import cn.cnki.ref.mapper.StudentParamsMapper;
import cn.cnki.ref.pojo.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

public interface StudentParamsController {
    @RestController
    public class StudentParamsMapper {

        @RequestMapping("/getStudentByIdAndName")
        public Student getStudentByIdAndName(@RequestParam("id") Integer id, @RequestParam("name") String name) {
            Student student = StudentParamsMapper.getStudentByIdAndName(id,name);
            return student;
        }

    }
}

测试

http://localhost:8080/getStudentByIdAndName?id=1&name=张三

2.绑定参数名

StudentParamsMapper

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="cn.cnki.ref.mapper.StudentParamsMapper">

    <!-- 根据用户名和id同时查询 -->
    <select id="getStudentByIdAndNameParam" resultType="cn.cnki.ref.pojo.Student">
        select * from student where name=#{name} and id=#{id}
    </select>

</mapper>

StudentParamsMapper.xml

package cn.cnki.ref.mapper;

import cn.cnki.ref.pojo.Student;
import org.apache.ibatis.annotations.Param;

public interface  StudentParamsMapper {

    /**
     * 根据用户名和id同时查询
     * @param id
     * @param name
     * @return
     */
    public Student getStudentByIdAndNameParam(@Param("id")Integer id, @Param("name")String name);

}

StudentParamsController

package cn.cnki.ref.controller;

import cn.cnki.ref.mapper.StudentParamsMapper;
import cn.cnki.ref.pojo.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

public interface StudentParamsController {
    @RestController
    public class StudentParamsMapper {
        @Autowired
        private cn.cnki.ref.mapper.StudentParamsMapper StudentParamsMapper;
        @RequestMapping("/getStudentByIdAndNameParam")
        public Student getStudentByIdAndNameParam(@RequestParam("id") Integer id, @RequestParam("name") String name) {
            Student student = StudentParamsMapper.getStudentByIdAndName(id,name);
            return student;
        }

    }
}

测试

http://localhost:8080/getStudentByIdAndNameParam?id=1&name=张三

3.封装实体参数

StudentParamsMapper

package cn.cnki.ref.mapper;

import cn.cnki.ref.pojo.Student;
import org.apache.ibatis.annotations.Param;

public interface  StudentParamsMapper {

    /**
     * 根据用户名和id同时查询
     * @param id
     * @param name
     * @return
     */
    public Student getStudentByIdAndNameByObjectParam(Student student);

}

StudentParamsMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="cn.cnki.ref.mapper.StudentParamsMapper">

    <!-- 根据用户名和id同时查询 -->
    <select id="getStudentByIdAndNameByObjectParam" resultType="cn.cnki.ref.pojo.Student">
        select * from student where name=#{name} and id=#{id}
    </select>

</mapper>

StudentParamsController

package cn.cnki.ref.controller;

import cn.cnki.ref.mapper.StudentParamsMapper;
import cn.cnki.ref.pojo.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

public interface StudentParamsController {
    @RestController
    public class StudentParamsMapper {
        @Autowired
        private cn.cnki.ref.mapper.StudentParamsMapper StudentParamsMapper;
        @RequestMapping("/getStudentByIdAndNameByObjectParam")
        public Student getStudentByIdAndNameByObjectParam(@RequestParam("id") Integer id, @RequestParam("name") String name) {
            Student student = new Student();
            student.setName(name);
            student.setId(id);
            Student studentQuery = StudentParamsMapper.getStudentByIdAndNameByObjectParam(student);
            return student;
        }

    }
}

测试

http://localhost:8080/getStudentByIdAndNameByObjectParam?id=1&name=张三