mybatis学习(3)：映射文件的配置和接口创建

db.properties
jdbc.driver=com.oracle.jdbc.OracleDriver
 jdbc.url=jdbc:oracle:thin:@127.0.0.1:1521:wiicare
 jdbc.username=wiicare
 jdbc.password=Mdsd123
 log4j.properties### 设置###
 log4j.rootLogger = ERROR,stdout
 ### è¾åºä¿¡æ¯å°æ§å¶æ¬ ###
 log4j.appender.stdout = org.apache.log4j.ConsoleAppender
 log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
 log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
 log4j.category.org.springframework.beans.factory=ERROR
 mybatis-config.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">
  <configutation>
  <!-- 引入数据库配置 -->
  <properties resource="db.properties"></properties>
  <!-- 定义别名 -->
  <typeAliases>
  <typeAlias type="com.geyao.mybatis.pojo.Blog" alias="Blog"></typeAlias>
  </typeAliases>
  <!-- 定义数据源 -->
  <environments default="">
  <environment id="development">
  <dataSource type="POOLED">
  <property name="driver" value="${jdbc.driver}"></property>
  <property name="url" value="${jdbc.url}"></property>
  <property name="username" value="${jdbc.username}"></property>
  <property name="password" value="${jdbc.password}"></property>
  </dataSource>
  </environment>
  </environments>
  <mappers>
  <package name="com.geyao.mabatis.mapper"></package>
  </mappers>
  </configutation>
 BlogMapper.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.geyao.mybatis.mapper.BlogMapper">
  <!-- statement -->
  <select id="selectBlog" parameterType="int" resultType="Blog">
  select * from Blog where id=#{id}
  </select>
  </mapper>
 BlogMapper类package com.geyao.mybatis.mapper;
 import com.geyao.mybatis.pojo.Blog;
 public interface BlogMapper {
     Blog selectBlog(Integer id);
 }
 Blog类package com.geyao.mybatis.pojo;
 public class Blog {
 }