1、idea创建maven工程
2、添加对应的依赖pom.xml
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.29</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.9</version>
</dependency>
3、创建user实体类
package com.geekmice.mvnmybatis.bo;
import java.util.Date;
public class UserDO {
private String userName;
private Date birthday;
private String sex;
private String address;
private String id;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
;Override
public String toString() {
return ;UserBO{; ;
;userName=;; ; userName ; ;;; ;
;, birthday=; ; birthday ;
;, sex=;; ; sex ; ;;; ;
;, address=;; ; address ; ;;; ;
;, id=;; ; id ; ;;; ;
;};;
}
}
4、创建数据层DAO
package com.geekmice.mvnmybatis.dao;
import com.geekmice.mvnmybatis.bo.UserDO;
import java.util.List;
public interface UserDAO {
List<UserDO> listUsers();
UserDO getUserById(String id);
}
5、创建映射文件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=;com.geekmice.mvnmybatis.dao.UserDAO;>
<select id=;listUsers; resultType=;com.geekmice.mvnmybatis.bo.UserDO;>
select
user_name as userName,
birthday,
sex,
address,
id
from user;
</select>
<!--根据id查询用户信息-->
<select id=;getUserById; parameterType=;java.lang.String; resultType=;com.geekmice.mvnmybatis.bo.UserDO;>
select
user_name as userName,
birthday,
sex,
address,
id
from user
<where>
<if test=;id != null || id != ;; ;>
id = #{id}
</if>
</where>
</select>
</mapper>
6、创建mybatis配置文件mybatis_config.xml
<?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>
<!--添加数据库连接映射属性文件-->
<properties resource=;dbconfig.properties;/>
<!--打印日志-->
<settings>
<setting name=;logImpl; value=;STDOUT_LOGGING;/>
</settings>
<!-- 7.environments数据库环境配置 -->
<!-- 和Spring整合后environments配置将被废除 -->
<environments default=;development;>
<environment id=;development;>
<!-- 使用JDBC事务管理 -->
<transactionManager type=;JDBC;/>
<!-- 数据库连接池 -->
<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>
<!-- 8.加载映射文件 -->
<mappers>
<mapper resource=;mapper/UserDao.xml;/>
</mappers>
</configuration>
7、创建数据库连接属性文件
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://192.168.*:3306/school?useSSL=false&useUnicode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=root
8、单元测试
package com.geekmice.mvnmybatis.test;
import com.geekmice.mvnmybatis.bo.UserDO;
import com.geekmice.mvnmybatis.dao.UserDAO;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;
import java.util.List;
public class MybatisTest {
private SqlSession sqlSession;
/**
* ;throws SQLException
* ;Description 读取配置文件;创建SQL工厂;打开回话
*/
;Before
public void init() throws SQLException, IOException {
InputStream is = Resources.getResourceAsStream(;mybatis_config.xml;);
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
SqlSessionFactory factory = builder.build(is);
sqlSession = factory.openSession();
}
/**
* ;Description 销毁回话
*/
;After
public void destroy() {
if (sqlSession != null) {
sqlSession.close();
}
}
;Test
public void test() throws IOException {
UserDAO userDAO = sqlSession.getMapper(UserDAO.class);
// 测试查询
List<UserDO> userDOList = userDAO.listUsers();
for (UserDO userDO : userDOList) {
System.out.println(userDO);
}
}
}
9、响应结果
Logging initialized using ‘class org.apache.ibatis.logging.stdout.StdOutImpl’ adapter.
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
Opening JDBC Connection
Created connection 1702940637.
Setting autocommit to false on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl;6580cfdd]
> Preparing: select user_name as userName, birthday, sex, address, id from user;
> Parameters:
< Columns: userName, birthday, sex, address, id
< Row: 胡一刀, 1995-07-07 00:00:00, 男, 197283;163.com, 1
<== Total: 1
UserBO{userName=‘胡一刀’, birthday=Fri Jul 07 00:00:00 CST 1995, sex=‘男’, address=‘197283;163.com’, id=‘1’}
Resetting autocommit to true on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl;6580cfdd]
Closing JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl;6580cfdd]
Returned connection 1702940637 to pool.
