配置數據源
配置myBatisConfig.xml全局配置文件
<?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>
<!-- 引入配置數據源的資源文件 -->
<properties resource="db.properties"></properties>
<!-- 配置類的別名(配置完後,別名就是類名) 注意:這裏的配置不能放在後面,否則會出錯無效 -->
<typeAliases>
<package name="com.mingde.po"/>
</typeAliases>
<!-- 配置開發環境 -->
<environments default="development">
<environment id="development">
<!-- 配置事務管理器 -->
<transactionManager type="JDBC" />
<!-- 配置數據源連接池 -->
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<!-- 配置sql語句映射文件 (以下可以2種一起配置)-->
<mappers>
<!-- 引用Empmapper.xml映射文件 -->
<mapper resource="com/mingde/mapper/Empmapper.xml" />
<!-- 引用映射sql語句註解的類 -->
<mapper class="com.mingde.dao.EmpDao" />
</mappers>
</configuration>
配置MyBatisUtils(配置SqlSessionFactory)
package com.mingde.utils;
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;
public class MyBatisUtils {
//獲取資源文件,創建SqlSessionFactory工廠
public static SqlSessionFactory getSqlSessionFactory()throws Exception{
InputStream inputStream = Resources.getResourceAsStream("myBatisConfig.xml");
return new SqlSessionFactoryBuilder().build(inputStream);
}
//打開SqlSessoinFactory工廠,獲取Sqlsession
public static SqlSession getSqlSession()throws Exception{
return getSqlSessionFactory().openSession();
}
//打開SqlSessoinFactory工廠,獲取Sqlsession,並且自動提交commit;
public static SqlSession getSqlSessionAutoCommit()throws Exception{
//注意:如果爲true,則進增刪改時,會自動commit提交,如果不寫或爲false的話則不會自動commit提交,則需要在寫完增刪改之後,session.commmit();
return getSqlSessionFactory().openSession(true);
}
}
定義Mapper接口
測試類