1.创建数据库

CREATE TABLE `t_user` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(50) DEFAULT NULL,`age` int(11) DEFAULT NULL,`address` varchar(255) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
use 't_user'
INSERT INTO `t_user` VALUES ('1', '李洪刚', '20', '江阳区嘉裕花园3栋四楼15#');
INSERT INTO `t_user` VALUES ('2', '王云华', '30', '纳溪区大渡镇红鱼村三大队');
INSERT INTO `t_user` VALUES ('3', '郑小翠', '21', '江阳区老窖花园2栋五楼15号');# 2.添加依赖
<font color="red"></font>
```java<dependencies><!--https://mvnrepository.com/artifact/org.mybatis/mybatis--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.6</version></dependency><!--https://mvnrepository.com/artifact/mysql/mysql-connector-java--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.40</version></dependency><!--https://mvnrepository.com/artifact/junit/junit--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version><scope>test</scope></dependency><!--https://mvnrepository.com/artifact/log4j/log4j--><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency></dependencies>

2.添加依赖

Maven repository

    <dependencies><!--https://mvnrepository.com/artifact/org.mybatis/mybatis--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.6</version></dependency><!--https://mvnrepository.com/artifact/mysql/mysql-connector-java--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.40</version></dependency><!--https://mvnrepository.com/artifact/junit/junit--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version><scope>test</scope></dependency><!--https://mvnrepository.com/artifact/log4j/log4j--><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency></dependencies>

3.创建实体类 user

package net.ty.mybatis.bean;/*** 功能：用户实体类*/
public class User {private int id;private String name;private int age;private String address;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return "User{" +"id=" + id +", name='" + name + '\'' +", age=" + age +", address='" + address + '\'' +'}';}
}

4.创建实体关系映射配置文件 usermapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="net.ty.mybatis.mapper.UserMapper"><select id="findById" parameterType="int" resultType="User">SELECT * FROM user WHERE id = #{id};</select><select id="findAll" resultType="User">SELECT * FROM user;</select>
</mapper>

5.创建mybatis配置文件 mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration><!--配置实体类别名--><typeAliases><typeAlias type="net.ty.mybatis.bean.User" alias="User"/></typeAliases><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/testdb"/><property name="username" value="root"/><property name="password" value="ccy123"/></dataSource></environment></environments><mappers><mapper resource="mapper/UserMapper.xml"/></mappers>
</configuration>

6.创建日志属性文件 log4j.propertis

log4j.rootLogger=WARN, stdout, logfile
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=target/spring.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n

测试：

package net.ty.mybatis.bean;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.After;
import org.junit.Before;
import org.junit.Test;import java.io.IOException;
import java.io.Reader;
import java.util.List;/*** 功能：测试用户操作*/
public class TestUserOperation {private SqlSession session;@Beforepublic void init() {try {// 读取mybatis配置文件Reader reader = Resources.getResourceAsReader("mybatis-config.xml");// 利用mybatis配置文件构建SQL会话工厂SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);// 利用SQL会话工厂获取会话session = factory.openSession();System.out.println("session对象已创建。");} catch (IOException e) {e.printStackTrace();}}@Testpublic void testFindById() {int id = 1;User user = session.selectOne("net.ty.mybatis.mapper.UserMapper.findById", id);if (user != null) {System.out.println(user);} else {System.out.println("编号为[" + id + "]的用户未找到。");}}@Testpublic void testFindAll() {List<User> users= session.selectList("net.ty.mybatis.mapper.UserMapper.findAll");for (User user : users) {System.out.println(user);}
//        users.forEach(user -> System.out.println(user));}@Afterpublic void destroy() {session.close();System.out.println("session对象已关闭。");}
}

(二)不使用MyBatis配置文件获取SQL会话对象：

1.接口——UserMapper

package net.ty.mybatis.mapper;import net.ty.mybatis.bean.User;
import org.apache.ibatis.annotations.Select;import java.util.List;public interface UserMapper {@Select("SELECT * FROM user WHERE id = #{id}")User findById(int id);@Select("SELECT * FROM user")List<User> findAll();
}

2.创建用户数据源工厂——UserDataSource

package net.ty.mybatis.datacource;import org.apache.ibatis.datasource.pooled.PooledDataSource;import javax.sql.DataSource;/*** 功能：用户数据源工厂*/
public class UserDataSourceFactory {public static DataSource getUserDataSource(){return new PooledDataSource("com.mysql.jdbc.Driver","jdbc:mysql://localhost:3306/testdb","root","ccy123");}
}

测试：

package net.ty.mybatis.mapper;import net.ty.mybatis.bean.User;
import net.ty.mybatis.datacource.UserDataSourceFactory;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.apache.ibatis.mapping.Environment;import javax.sql.DataSource;
import java.util.List;/*** 功能：测试用户映射器接口*/
public class TestUserMapperNew {private SqlSession session;private UserMapper userMapper;@Beforepublic void init() {//获取数据源DataSource dataSource = UserDataSourceFactory.getUserDataSource();//创建事物工厂TransactionFactory transactionFactory = new JdbcTransactionFactory();//创建数据库环境Environment environment = new Environment("development", transactionFactory, dataSource);//基于环境创造配置对象Configuration configuration = new Configuration(environment);//添加用户映射器接口configuration.addMapper(UserMapper.class);// 利用mybatis配置文件构建SQL会话工厂SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(configuration);// 利用SQL会话工厂获取会话session = factory.openSession();userMapper = session.getMapper(UserMapper.class);System.out.println("session对象已创建。");}@Testpublic void testFindById() {int id = 1;User user = userMapper.findById(id);if (user != null) {System.out.println(user);} else {System.out.println("编号为[" + id + "]的用户未找到。");}}@Testpublic void testFindAll() {List<User> users = userMapper.findAll();users.forEach(user -> System.out.println(user));System.out.println();for (int i = 0; i < users.size(); i++) {System.out.println(users.get(i));}System.out.println();for (User user : users) {System.out.println(user);}}@Afterpublic void destroy() {session.close();System.out.println("session对象已关闭。");}
}

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文章目录

1.创建数据库

2.添加依赖

3.创建实体类 user

4.创建实体关系映射配置文件 usermapper.xml

5.创建mybatis配置文件 mybatis-config.xml

6.创建日志属性文件 log4j.propertis

测试：

(二)不使用MyBatis配置文件获取SQL会话对象：

1.接口——UserMapper

2.创建用户数据源工厂——UserDataSource

测试：

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