![V{H4$2)52RJD97A[5H4%CF.png
pom.xml引入依賴
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
</dependencies>
在resources中引入 log4j.properties文件
# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE debug info warn error fatal
log4j.rootCategory=debug, CONSOLE, LOGFILE
# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE
# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n
# LOGFILE is set to be a File appender using a PatternLayout.
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=d:\axis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n
編寫數(shù)據(jù)庫中的實體類
package com.itheima.domain;
import java.io.Serializable;
import java.util.Date;
public class User implements Serializable {
private Integer id;
private String username;
private String address;
private String sex;
private Date birthday;
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", address='" + address + '\'' +
", sex='" + sex + '\'' +
", birthday=" + birthday +
'}';
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
}
編寫 IUserDao 接口
package com.itheima.dao;
import com.itheima.domain.User;
import java.util.List;
/**
* 用戶的持久層接口
*/
public interface IUserDao {
/**
* 查詢所有用戶
* @return
*/
List<User> findAll();
}
編寫SqlMapConfig.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>
<!--配置環(huán)境-->
<environments default="mysql">
<!--配置mysql的環(huán)境-->
<environment id="mysql">
<!--配置事務的類型-->
<transactionManager type="JDBC"></transactionManager>
<!--配置數(shù)據(jù)源(連接池)-->
<dataSource type="POOLED">
<!--配置數(shù)據(jù)庫的基本信息-->
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/eesy_mybatis"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<!--指定映射配置文件的位置,映射配置文件指的是每個dao獨立的配置文件-->
<mappers>
<mapper resource="com/itheima/dao/IUserDao.xml"/>
</mappers>
</configuration>
在resources目錄下建立 com --> itheima -->dao 注意要一個一個建立 編寫IUserDao.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.itheima.dao.IUserDao">
<select id="findAll" resultType="com.itheima.domain.User">
select * from user
</select>
</mapper>
測試類
package com.itheima.test;
import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
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.InputStream;
import java.util.List;
public class MybatisTest {
@Test
public void testFindAll() throws Exception{
//1.讀取配置文件
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");//這行有問題,所有才寫了博客
//2.創(chuàng)建 SqlSessionFactory 的構建者對象
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
//3.使用構建者創(chuàng)建工廠對象 SqlSessionFactory
SqlSessionFactory factory = builder.build(in);
//4.使用 SqlSessionFactory 生產 SqlSession 對象
SqlSession session = factory.openSession();
//5.使用 SqlSession 創(chuàng)建 dao 接口的代理對象
IUserDao userDao = session.getMapper(IUserDao.class);
//6.使用代理對象執(zhí)行查詢所有方法
List<User> users = userDao.findAll();
for(User user : users) {
System.out.println(user);
}
//7.釋放資源
session.close();
in.close();
}
}