mybatis增删改查进阶版

1.表

 2.实体类

package com.sunyu.pojo;

import java.util.Objects;

public class Student {
    private Integer studentId;
    private String studentName;
    private Integer studentAge;
    private Integer math;
    private Integer chinese;
    private Integer english;
    public Student(){

    }

    public Student(Integer studentId, String studentName, Integer studentAge, Integer math, Integer chinese, Integer english) {
        this.studentId = studentId;
        this.studentName = studentName;
        this.studentAge = studentAge;
        this.math = math;
        this.chinese = chinese;
        this.english = english;
    }

    public Integer getStudentId() {
        return studentId;
    }

    public void setStudentId(Integer studentId) {
        this.studentId = studentId;
    }

    public String getStudentName() {
        return studentName;
    }

    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }

    public Integer getStudentAge() {
        return studentAge;
    }

    public void setStudentAge(Integer studentAge) {
        this.studentAge = studentAge;
    }

    public Integer getMath() {
        return math;
    }

    public void setMath(Integer math) {
        this.math = math;
    }

    public Integer getChinese() {
        return chinese;
    }

    public void setChinese(Integer chinese) {
        this.chinese = chinese;
    }

    public Integer getEnglish() {
        return english;
    }

    public void setEnglish(Integer english) {
        this.english = english;
    }

    @Override
    public String toString() {
        return "Student{" +
                "studentId=" + studentId +
                ", studentName='" + studentName + '\'' +
                ", studentAge=" + studentAge +
                ", math=" + math +
                ", chinese=" + chinese +
                ", english=" + english +
                '}';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Student)) return false;
        Student student = (Student) o;
        return studentId.equals(student.studentId) && studentName.equals(student.studentName) && studentAge.equals(student.studentAge) && math.equals(student.math) && chinese.equals(student.chinese) && english.equals(student.english);
    }

    @Override
    public int hashCode() {
        return Objects.hash(studentId, studentName, studentAge, math, chinese, english);
    }
}

3.接口

package com.sunyu.mapper;

import com.sunyu.pojo.Student;
import org.apache.ibatis.annotations.Param;

import java.util.List;
import java.util.Map;

public interface StudentMapper {
//    添加学生
    int insertStudent();
    boolean deleteStudent();
    Student selectStudent(@Param("studentName") String studentName , @Param("studentAge") Integer studentAge);
    List<Student>getAllStudentInfor(@Param("studentAge") Integer studentAge);
    List<Map<String,Student>>listStudent();
    List<Student>getStudentByLike(@Param("studentAge") Integer studentAge);
    boolean insertStudentInfor(@Param("studentId")Integer studentId,@Param("studentName") String studentName,@Param("studentAge") Integer studentAge,@Param("math") Integer math,@Param("chinese") Integer chinese , @Param("english")Integer english);
}
4.获取代理sqlsession

package com.sunyu.solo;

import com.sunyu.mapper.StudentMapper;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;

public class GetSession {
    public static SqlSession session() throws IOException {
//        构建核心配置文件输入流
        InputStream resourceAsStream = Resources.getResourceAsStream("mybatis-config.xml");
//        获取sql对象
        SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
//        获取sqlsessionfactory对象
        SqlSessionFactory build = sqlSessionFactoryBuilder.build(resourceAsStream);
//        获取sql的会话对象sqlsession，用来操作数据库
        SqlSession sqlSession = build.openSession(true);
        return sqlSession;
//        获取接口的代理实现类对象
    }
}

5.映射文件

<?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">
<!--<1&#45;&#45;namespace与mapper接口的全类名保持一致，-->
<mapper namespace="com.sunyu.mapper.StudentMapper">
<!--    添加学生-->
<!--    int insertStudent();-->
    <insert id="insertStudent">
        insert into grade
        values
        (null,"ok",23,56,46,79)
    </insert>
<!--    boolean deleteStudent();-->
    <delete id="deleteStudent">
        DELETE from grade where student_id = 1092
    </delete>
<!--    Student selectStudent(@Param("studentName") String studentName , @Param("studentAge") Integer studentAge);-->
<select id="selectStudent" resultType="Student">
    select * from grade where student_name = #{studentName} and student_age = #{studentAge}
</select>
<!--    List<Student>getAllStudentInfor(Integer studentAge);-->
    <select id="getAllStudentInfor" resultType="Student">
        select * from grade where student_age = #{studentAge}
    </select>
<!--    List<Map<String,Student>>listStudent();-->
    <select id="listStudent" resultType="map">
        select * from grade
    </select>
<!--    List<Student>getStudentByLike(@Param("studentAge") Integer studentAge);-->
    <select id="getStudentByLike" resultType="Student">
         select * from grade where student_age like '%${studentAge}%'

    </select>
<!--    boolean insertStudentInfor(@Param("studentId")Integer studentId,@Param("studentName") String studentName,@Param("studentAge") Integer studentAge,@Param("math") Integer math,@Param("chinese") Integer chinese , @Param("english")Integer english);-->
    <insert id="insertStudentInfor" useGeneratedKeys="true" keyProperty="student_id">
        insert into grade values (null,#{studentName},#{studentAge},#{math},#{chinese},#{english})
    </insert>
</mapper>

6.核心文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--    引入properties文件-->
    <properties resource="jdbc.properties"></properties>
<!--    给父类设置别名-->
    <typeAliases>
<!--        <typeAlias type="com.sunyu.pojo.Student"></typeAlias>-->
<!--        通过包设置类型别名默认别名为类名-->
        <package name="com.sunyu.pojo"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <!--引入mybatis的映射文件-->
    <mappers>
<!--        将映射文件包名输入具备的条件：-->
<!--        1.mapper接口和映射文件所在的包必须一致-->
<!--        2.mapper接口的名字与映射文件名字必须一致-->
        <package name="com.sunyu.mapper"/>
    </mappers>
</configuration>