一、mybatis四个核心组件:
1.SqlsessionFactoryBuilder(构造器):可用配置或代码生成SqlSessionFactory。
2.SqlSessionFactory(工厂接口):生成SqlSession。
3.SqlSession(会话):既可以发送SQL执行返回结果,也可以获取Mapper的接口,作用类似JDBC中connection。
4.Sql Mapper(映射器):由接口和xml构成,给出对应的SQL和映射gu规则。
二、xml构建SqlSessionFactory
1.创建java项目,需要添加mybatis.jar下载链接https://github.com/mybatis/mybatis-3/releases
2.创建mybatis-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"mybatis-3-config.dtd">
<configuration>
<!-- 数据库环境 -->
<environments default="development">
<environment id="development">
<!-- 采用JDBC管理器方式 -->
<transactionManager type="JDBC"/>
<!-- POOLED采用mybabtis内部连接池方式 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/test"/>
<property name="username" value="root"/>
<property name="password" value="1234"/>
</dataSource>
</environment>
</environments>
</configuration>
3.创建factory生成SqlSessionFactory
package com.factory;
import java.io.IOException;
import java.io.InputStream;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class Factory {
public static void main(String[] args) {
String resource = "mybatis-config.xml";
try {
InputStream inputstream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory =
new SqlSessionFactoryBuilder().build(inputstream);
System.out.println(sqlSessionFactory);
} catch (IOException e) {
e.printStackTrace();
}
}
}
3.运行factory出现如下图则成功拿到SqlSessionFactory