注意:以上这些都不是框架,JDBC 是规范,Spring 的 JdbcTemplate 和 Apache 的 DBTuils 都是工具类
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<groupId>org.examplegroupId>
<artifactId>MyBatisTest1artifactId>
<version>1.0-SNAPSHOTversion>
<packaging>jarpackaging>
<dependencies>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatisartifactId>
<version>3.5.6version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>8.0.15version>
dependency>
dependencies>
project>
package domain;
import java.io.Serializable;
import java.util.Date;
public class User implements Serializable {
private Integer id;
private String username;
private Date birthday;
private String sex;
private String address;
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 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;
}
@Override
public String toString() {
return "domain.User{" +
"id=" + id +
", username='" + username + '\'' +
", birthday=" + birthday +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
'}';
}
}
IUserDao 接口如下:
package dao;
import domain.User;
import java.util.List;
/**
* 用户的持久层接口
*/
public interface IUserDao {
/**
* 查询所有操作
* @return
*/
List<User> findAll();
}
<configuration>
<environments default="mysql">
<environment id="mysql">
<transactionManager type="JDBC">transactionManager>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatisdata"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
dataSource>
environment>
environments>
<mappers>
<mapper resource="dao/IUserDao.xml"/>
mappers>
configuration>
<mapper namespace="dao.IUserDao">
<select id="findAll">
select * from user
select>
mapper>
CREATE TABLE `user`(
`id` int(11) NOT NULL auto_increment,
`username` varchar(32) NOT NULL COMMENT '用户名称',
`birthday` datetime DEFAULT NULL COMMENT '生日',
`sex` char(1) DEFAULT NULL COMMENT '性别',
`address` varchar(256) DEFAULT NULL COMMENT '地址',
PRIMARY KEY (`id`),
)ENGINE=INNODB DEFAULT CHARSET=utf8;
import dao.IUserDao;
import 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 java.io.InputStream;
import java.util.List;
/**
* mybatis 的入门案例
*/
public class MybatisTest {
public static void main(String[] args) throws Exception{
//1.读取配置文件
//2.创建一个 SqlSessionFactory 工厂
//3.使用工厂生产 SqlSession 对象
//4.使用 SqlSession 创建 Dao 接口的代理对象
//5.使用代理对象执行方法
//6.释放资源
//1.读取配置文件
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
//2.创建一个 SqlSessionFactory 工厂
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
SqlSessionFactory factory = builder.build(in);
//3.使用工厂生产 SqlSession 对象
SqlSession session = factory.openSession();
//4.使用 SqlSession 创建 Dao 接口的代理对象
IUserDao userDao = session.getMapper(IUserDao.class);
//5.使用代理对象执行方法
List<User> users = userDao.findAll();
for (User user: users){
System.out.println(user);
}
//6.释放资源
session.close();
in.close();
}
}
log4j.rootLogger=INFO,CONSOLE
log4j.addivity.org.apache=true
# console
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Threshold=INFO
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.Encoding=UTF-8
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[demo] %-5p %d{
yyyy-MM-dd HH\:mm\:ss} - %C.%M(%L)[%t] - %m%n
# all
log4j.logger.com.demo=INFO, DEMO
log4j.appender.DEMO=org.apache.log4j.RollingFileAppender
log4j.appender.DEMO.File=${catalina.base}/logs/demo.log
log4j.appender.DEMO.MaxFileSize=50MB
log4j.appender.DEMO.MaxBackupIndex=3
log4j.appender.DEMO.Encoding=UTF-8
log4j.appender.DEMO.layout=org.apache.log4j.PatternLayout
log4j.appender.DEMO.layout.ConversionPattern=[demo] %-5p %d{
yyyy-MM-dd HH\:mm\:ss} - %C.%M(%L)[%t] - %m%n
&
要转义为 &
,要记得加分号,不要只写了前面的字母;这是第一次接触 web 的框架,很多知识也不了解,如果上面有写错的地方,欢迎留言,共同学习。