根目录:
数据库表:
接口类:
package com.qst.dao;
import com.qst.mybatis.Employee;
public interface EmployeeMapper {
public Employee getEmpById(Integer id);
}
JAVABEAN:
package com.qst.mybatis;
public class Employee {
private Integer id;
private String name;
private String email;
private String gender;
@Override
public String toString() {
return "Employee [id=" + id + ", name=" + name + ", email=" + email + ", gender=" + gender + "]";
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
}
测试类:
package com.qst.test;
import java.io.IOException;
import java.io.InputStream;
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.jupiter.api.Test;
import com.qst.dao.EmployeeMapper;
import com.qst.mybatis.Employee;
class myBatisTest {
public SqlSessionFactory getSqlsessionFactory() throws IOException {
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
return new SqlSessionFactoryBuilder().build(inputStream);
}
/*
public void test01() throws IOException {
SqlSessionFactory sqlSessionFactory = getSqlsessionFactory();
SqlSession openSession = sqlSessionFactory.openSession();
try {
Employee employee = openSession.selectOne("com.qst.BlogMapper.selectEmp", 1);
System.out.println(employee);
}finally {
openSession.close();
}
}
*/
@Test
public void test02() throws IOException {
SqlSessionFactory sqlSessionFactory = getSqlsessionFactory();
SqlSession openSession = sqlSessionFactory.openSession();
try{
EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);
Employee empById = mapper.getEmpById(1);
System.out.println(empById);
}finally {
openSession.close();
}
}
}
XML文件
EmployeeMapper.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.qst.dao.EmployeeMapper">
<select id="getEmpById" resultType="employee">
select * from employee where id = #{id}
</select>
</mapper>
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>
<properties resource="db.properties"></properties>
<settings >
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
<!-- 别名 (建议使用全类名)-->
<typeAliases>
<!-- 默认别名employee 不分大小写 -->
<typeAlias type="com.qst.mybatis.Employee" alias="employee"/>
<!-- 批量别名 使用@Alias注解起新的别名
<package name="com.qst.mybatis"/>
-->
</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>
<mappers>
<mapper resource="EmployeeMapper.xml" />
</mappers>
</configuration>
log4j.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration PUBLIC "-//log4j/log4j Configuration//EN" "log4j.dtd">
<log4j:configuration>
<!--输出到控制台-->
<appender name="consoleAppender" class="org.apache.log4j.ConsoleAppender">
<param name="Threshold" value="DEBUG"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>
</layout>
</appender>
<!--输出到文件(info)-->
<!--将生成“info.log.2014-06-11”这样的日志文件-->
<appender name="fileAppenderInfo" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="${user.home}/logs/website/info.log" />
<param name="DatePattern" value=".yyyy-MM-dd" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMin" value="INFO" />
<param name="LevelMax" value="INFO" />
</filter>
</appender>
<!--输出到文件(warn)-->
<appender name="fileAppenderWarn" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="${user.home}/logs/website/warn.log" />
<param name="DatePattern" value=".yyyy-MM-dd" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMin" value="WARN" />
<param name="LevelMax" value="WARN" />
</filter>
</appender>
<!--输出到文件(error)-->
<appender name="fileAppenderError" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="${user.home}/logs/website/error.log" />
<param name="DatePattern" value=".yyyy-MM-dd" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMin" value="ERROR" />
<param name="LevelMax" value="ERROR" />
</filter>
</appender>
<!--屏蔽所有org.springframework.*输出的Debug(及以下)信息-->
<logger name="org.springframework">
<level value="INFO"></level>
</logger>
<root>
<level value="ALL"/>
<appender-ref ref="consoleAppender" />
<appender-ref ref="fileAppenderInfo" />
<appender-ref ref="fileAppenderWarn" />
<appender-ref ref="fileAppenderError" />
</root>
</log4j:configuration>
properties配置文件
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=root