mybatis教程-快速启动

1、准备数据库表

1.1、创建数据库表

CREATE TABLE `student` (
  `sid` int(11) NOT NULL AUTO_INCREMENT,
  `sname` varchar(100) DEFAULT NULL,
  `sage` int(11) DEFAULT NULL,
  `ssex` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`sid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4

1.2、插入测试数据

insert into student(sname,sage,ssex) values("joker",18,"男")

2、引入依赖

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.3</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.19</version>
</dependency>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.11</version>
    <scope>test</scope>
</dependency>

3、mybatis全局配置文件

<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://127.0.0.1:3306/test?useUnicode=true"/>
                <property name="username" value="root"/>
                <property name="password" value="joker123456"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="mappers/StudentMapper.xml"/>
    </mappers>
</configuration>

4、Mapper配置文件

<?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" >
<mapper namespace="org.mybatis.example.mapper.StudentMapper">
    <select id="selectByName" resultType="org.mybatis.example.bean.Student">
        select * from student where sname = #{name,jdbcType=VARCHAR} limit 1
    </select>
</mapper>

5、测试

StudentTest.java

package org.mybatis.example;

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 org.junit.BeforeClass;
import org.junit.Test;
import org.mybatis.example.bean.Student;
import org.mybatis.example.mapper.StudentMapper;

import java.io.InputStream;

public class StudentTest {
    static SqlSessionFactory sqlSessionFactory;

    @BeforeClass
    public static void beforeClass() throws Exception {
        String config = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(config);
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    }

    @Test
    public void selectStudentByName() {
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        StudentMapper studentMapper = sqlSession.getMapper(StudentMapper.class);
        Student student = studentMapper.selectByName("joker");
        System.out.println(student);
        sqlSession.close();
    }
}

6、代码展示

Student.java

package org.mybatis.example.bean;

public class Student {
    private Integer sid;
    private String sname;
    private Integer sage;
    private String ssex;

    public Student() {
    }

    public Student(Integer sid, String sname, Integer sage, String ssex) {
        this.sid = sid;
        this.sname = sname;
        this.sage = sage;
        this.ssex = ssex;
    }

    public Integer getSid() {
        return sid;
    }

    public void setSid(Integer sid) {
        this.sid = sid;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public Integer getSage() {
        return sage;
    }

    public void setSage(Integer sage) {
        this.sage = sage;
    }

    public String getSsex() {
        return ssex;
    }

    public void setSsex(String ssex) {
        this.ssex = ssex;
    }

    @Override
    public String toString() {
        return "Student{" +
                "sid=" + sid +
                ", sname='" + sname + '\'' +
                ", sage=" + sage +
                ", ssex='" + ssex + '\'' +
                '}';
    }
}

StudentMapper.java

package org.mybatis.example.mapper;

import org.mybatis.example.bean.Student;

public interface StudentMapper {
    Student selectByName(String name);
}

7、项目结构

来源：CSDN

作者：Tian Joker

链接：https://blog.csdn.net/tppSunBoy/article/details/104748246

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MyBatis

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mapper