下載網站:

　　　https://github.com/mybatis/mybatis-3/releases

1.引入web項目下引入mybatis.jar

　　引入到WebRoot/WEB-INF/lib下

2.配置 mybatis 核心配置文件(這個在mybatis源碼包中)

?　　mybatis-3-mybatis-3.4.5\src\test\java\org\apache\ibatis\submitted\complex_property\Configuration.xml

?　　將Configuration.xml復制到web項目中

　　?配置核心配置文件

<configuration><environments default="development"><environment id="development"><transactionManager type="JDBC"><property name="" value=""/></transactionManager><dataSource type="UNPOOLED"><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/micro_message"/><property name="username" value="root"/><property name="password" value="123456"/></dataSource></environment></environments><mappers><mapper resource="com/daoan/config/sqlxml/Message.xml"/></mappers> </configuration>

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3.得到sqlSession對象

　　

import java.io.IOException; import java.io.Reader;import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder;/*** 訪問數據庫類*/ public class DBAccess {public SqlSession getSqlSession() throws IOException {//通過配置文件獲取數據庫連接信息Reader reader = Resources.getResourceAsReader("com/daoan/config/Configuration.xml");//通過配置信息構建SqlSessionFactoySqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);//通過SqlSessionFactoy打開一個數據庫會話SqlSession sqlSession = sqlSessionFactory.openSession();return sqlSession;} }

4.使用Mybatis框架來連接連接sql以及執行sql語句

/*** 和Message表相關的數據庫操作*/ public class MessageDao { /*** 根據查詢條件，查詢消息列表*/public List<Message> queryMessageList(String command,String description) {DBAccess dbAccess = new DBAccess();List <Message> messageList = new ArrayList<Message>();SqlSession sqlSession = null;try {sqlSession = dbAccess.getSqlSession();//通過sqlSession執行SQL語句messageList = sqlSession.selectList("Message.queryMessageList");} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if(sqlSession !=null){sqlSession.close();sqlSession = null;}}return messageList;}public static void main(String[] args) {MessageDao messageDao = new MessageDao();messageDao.queryMessageList("", "");} }

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5.Message.xml配置文件 (取出數據庫某個字段的值放在java的對象的屬性里面)

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="Message"><resultMap type="com.daoan.bean.Message" id="MessageResult"><id column="Id" jdbcType="INTEGER" property="id"/><result column="Command" jdbcType="VARCHAR" property="command"/><result column="Description" jdbcType="VARCHAR" property="description"/><result column="Context" jdbcType="VARCHAR" property="context"/></resultMap><select id="queryMessageList" resultMap="MessageResult">select Id,Command,Description,Context from message where 1=1</select> </mapper>

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轉載于:https://www.cnblogs.com/xdalsh/p/8448922.html

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