使用Idea和maven搭建Mybatis框架以及基础测试

创建maven工程

目录结构

导入相关的jar

导入mybatis和mysql驱动相关的jar

<dependencies>

      <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
      <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>8.0.13</version>
      </dependency>

      <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis</artifactId>
          <version>3.5.1</version>
      </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

编写mybatis的全局配置文件

<?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>
    <settings>
        <!--控制台输出SQL语句-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <!-- 配置数据库连接信息 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/db5?characterEncoding=UTF8&amp;useSSL=false&amp;serverTimezone=UTC&amp;rewriteBatchedStatements=true"/>
                <property name="username" value="root" />
                <!--密码换成自己的-->
                <property name="password" value="******" />
            </dataSource>
        </environment>
    </environments>
    <!--通过config.xml文件与对应的文件绑定-->
    <mappers>
        <mapper resource="com/xzy/mapper/EmpMapper.xml"/>
    </mappers>
</configuration>

编写实体类

package com.xzy.bean;

public class EmpInfo {
    
    
    private Integer empNo;
    private String ename;
    private String job;
    private Integer mgr;
    private String hireDate;
    private Double sal;
    private Double comm;
    private Integer deptNo;

    public EmpInfo() {
    
    
    }

    public Integer getEmpNo() {
    
    
        return empNo;
    }

    public void setEmpNo(Integer empNo) {
    
    
        this.empNo = empNo;
    }

    public String getEname() {
    
    
        return ename;
    }

    public void setEname(String ename) {
    
    
        this.ename = ename;
    }

    public String getJob() {
    
    
        return job;
    }

    public void setJob(String job) {
    
    
        this.job = job;
    }

    public Integer getMgr() {
    
    
        return mgr;
    }

    public void setMgr(Integer mgr) {
    
    
        this.mgr = mgr;
    }

    public String getHireDate() {
    
    
        return hireDate;
    }

    public void setHireDate(String hireDate) {
    
    
        this.hireDate = hireDate;
    }

    public Double getSal() {
    
    
        return sal;
    }

    public void setSal(Double sal) {
    
    
        this.sal = sal;
    }

    public Double getComm() {
    
    
        return comm;
    }

    public void setComm(Double comm) {
    
    
        this.comm = comm;
    }

    public Integer getDeptNo() {
    
    
        return deptNo;
    }

    public void setDeptNo(Integer deptNo) {
    
    
        this.deptNo = deptNo;
    }

    @Override
    public String toString() {
    
    
        return "EmpInfo{" +
                "empNo=" + empNo +
                ", ename='" + ename + '\'' +
                ", job='" + job + '\'' +
                ", mgr=" + mgr +
                ", hireDate='" + hireDate + '\'' +
                ", sal=" + sal +
                ", comm=" + comm +
                ", deptNo=" + deptNo +
                '}';
    }
}

编写接口

package com.xzy.mapper;


import com.xzy.bean.EmpInfo;

import java.util.List;

public interface EmpMapper {
    
    
    List<EmpInfo> findAllEmp();
}

编写接口对应的mapper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">
<!--将接口与XML文件绑定-->
<mapper namespace="com.xzy.mapper.EmpMapper">
    <select id="findAllEmp"  resultType="java.lang.String">
        select * from  emp
    </select>

</mapper>

测试

package org.xzy;

import com.xzy.bean.EmpInfo;
import com.xzy.mapper.EmpMapper;
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.Test;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class AppTest {
    
    
    @Test
    public void test01() throws IOException {
    
    
        InputStream is = Resources.getResourceAsStream("config.xml");
        SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(is);
        SqlSession session = ssf.openSession();
        EmpMapper em = session.getMapper(EmpMapper.class);
        List<EmpInfo> allEmp = em.findAllEmp();
        System.out.println(allEmp);
        session.close();
    }
}

填坑

找不到对应的mapper文件的解决方法：
在pom.xml文件中添加如下扫描相关配置

      <resources>
          <resource>
              <directory>src/main/java</directory>
              <includes>
                  <include>**/*.xml</include>
              </includes>
              <filtering>true</filtering>
          </resource>
      </resources>
  </build>
</project>