框架编程技术笔记

框架编程技术笔记**

1. 环境搭建

   • 将jar包复制到META-INF下的lib里面

     

   • 右击项目——>build path——>config build path——>add jars，找到相应的jar包添加到项目即可

     

   • 添加libraries，点击add library，找到Junit，把Junit添加到项目中

     

2. 编写核心XML文件——mybatis-config.xml文件

   • 在java resources下创建一个source folder，命名为resources

   • 在resources下需要创建三个文件分别为：database.properties/log4j.properties/mybatis-config.xml

     

   • datebase.properties的具体代码为

     driver=com.mysql.jdbc.Driver
     url=jdbc:mysql://localhost:3306/smbms?useUnicode=true&characterEncoding=utf-8
     user=root
     password=root
     

   • log4j.properties的具体代码为

     log4j.rootLogger=DEBUG,CONSOLE,file
     #log4j.rootLogger=ERROR,ROLLING_FILE
     log4j.logger.cn.smbms.dao=debug
     log4j.logger.com.ibatis=debug 
     log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug 
     log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug 
     log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug 
     log4j.logger.java.sql.Connection=debug 
     log4j.logger.java.sql.Statement=debug 
     log4j.logger.java.sql.PreparedStatement=debug 
     log4j.logger.java.sql.ResultSet=debug 
     log4j.logger.org.tuckey.web.filters.urlrewrite.UrlRewriteFilter=debug
     
     ######################################################################################
     # Console Appender  \u65e5\u5fd7\u5728\u63a7\u5236\u8f93\u51fa\u914d\u7f6e
     ######################################################################################
     log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
     log4j.appender.Threshold=error
     log4j.appender.CONSOLE.Target=System.out
     log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
     log4j.appender.CONSOLE.layout.ConversionPattern= [%p] %d %c - %m%n
     
     
     ######################################################################################
     # DailyRolling File  \u6bcf\u5929\u4ea7\u751f\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\uff0c\u6587\u4ef6\u540d\u683c\u5f0f:log2009-09-11
     ######################################################################################
     log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
     log4j.appender.file.DatePattern=yyyy-MM-dd
     log4j.appender.file.File=log.log
     log4j.appender.file.Append=true
     log4j.appender.file.Threshold=error
     log4j.appender.file.layout=org.apache.log4j.PatternLayout
     log4j.appender.file.layout.ConversionPattern=%d{yyyy-M-d HH:mm:ss}%x[%5p](%F:%L) %m%n
     
     
     log4j.logger.com.opensymphony.xwork2=error  
     
     

   • mybatis-config的代码为

     <?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">
     
     <!-- 通过这个配置文件完成mybatis与数据库的连接 -->
     <configuration>
     	<!-- 引入 database.properties 文件-->
     	<properties resource="database.properties"/>
     	<!-- 配置mybatis的log实现为LOG4J -->
     	<settings>
     		<setting name="logImpl" value="LOG4J" />
     	</settings>
     	<environments default="development">
     		<environment id="development">
     			<!--配置事务管理，采用JDBC的事务管理  -->
     			<transactionManager type="JDBC"></transactionManager>
     			<!-- POOLED:mybatis自带的数据源，JNDI:基于tomcat的数据源 -->
     			<dataSource type="POOLED">
     				<property name="driver" value="${driver}"/>
     				<property name="url" value="${url}"/>
     				<property name="username" value="${user}"/>
     				<property name="password" value="${password}"/>
     			</dataSource>
     		</environment>
     	</environments>
     	
     	<!-- 将mapper文件加入到配置文件中 -->
     	<mappers>
     		<mapper resource="cn/smbms/dao/provider/ProviderMapper.xml"/>
     	</mappers>
                     
     </configuration>
     
     

3. 编写src下的pojo和Mapper

   • src下右键——>new package，取名cn.smbms.dao.provider（以超市管理系统为例）,在其下新建一个ProviderMapper.xml的文件

     

   • ProviderMapper.xml的作用是书写sql语言，以便于对数据库进行操作，ProviderMapper.xml的具体代码如下

     <?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="cn.smbms.dao.provider.ProviderMapper">
     
     	<!-- 查询供应商表记录数 -->
     	<select id="count" resultType="int">
     		select count(1) as count from smbms_provider
     	</select>
     	
     </mapper>
     

   • src下右键——>new package，取名cn.smbms.pojo，其作用是创建provider对象。具体的代码如下：

     package cn.smbms.pojo;
     import java.util.*;
     public class Provider {
     	private Integer id;//id
     	private String proCode;//供货商编码
     	private String proName;//供货商名
     	private String proDesc;
     	private String proContact;
     	private String proPhone;
     	private String proAddress;
     	private String proFax;
     	private Integer createdBy;   //创建者
     	private Date creationDate; //创建时间
     	private Integer modifyBy;     //更新者
     	private Date modifyDate;   //更新时间
     	public Integer getId() {
     		return id;
     	}
     	public void setId(Integer id) {
     		this.id = id;
     	}
     	public String getProCode() {
     		return proCode;
     	}
     	public void setProCode(String proCode) {
     		this.proCode = proCode;
     	}
     	public String getProName() {
     		return proName;
     	}
     	public void setProName(String proName) {
     		this.proName = proName;
     	}
     	public String getProDesc() {
     		return proDesc;
     	}
     	public void setProDesc(String proDesc) {
     		this.proDesc = proDesc;
     	}
     	public String getProContact() {
     		return proContact;
     	}
     	public void setProContact(String proContact) {
     		this.proContact = proContact;
     	}
     	public String getProPhone() {
     		return proPhone;
     	}
     	public void setProPhone(String proPhone) {
     		this.proPhone = proPhone;
     	}
     	public String getProAddress() {
     		return proAddress;
     	}
     	public void setProAddress(String proAddress) {
     		this.proAddress = proAddress;
     	}
     	public String getProFax() {
     		return proFax;
     	}
     	public void setProFax(String proFax) {
     		this.proFax = proFax;
     	}
     	public Integer getCreatedBy() {
     		return createdBy;
     	}
     	public void setCreatedBy(Integer createdBy) {
     		this.createdBy = createdBy;
     	}
     	public Date getCreationDate() {
     		return creationDate;
     	}
     	public void setCreationDate(Date creationDate) {
     		this.creationDate = creationDate;
     	}
     	public Integer getModifyBy() {
     		return modifyBy;
     	}
     	public void setModifyBy(Integer modifyBy) {
     		this.modifyBy = modifyBy;
     	}
     	public Date getModifyDate() {
     		return modifyDate;
     	}
     	public void setModifyDate(Date modifyDate) {
     		this.modifyDate = modifyDate;
     	}
     	
     	
     }
     
     

4. 编写test文件夹

   • 编写测试类ProviderMapperTest.java

     package cn.smbms.dao.provider;
     
     import static org.junit.Assert.*;
     
     import java.io.IOException;
     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;
     import org.apache.log4j.Logger;
     import org.junit.Before;
     import org.junit.Test;
     
     public class ProviderMapperTest {
     	
     	private Logger logger = Logger.getLogger(ProviderMapperTest.class);
     	
     	@Before
     	public void setUp() throws Exception {
     	}
     
     	@Test
     	public void test() {
     		String resource = "mybatis-config.xml";
     		int count = 0;
     		SqlSession sqlSession = null;
     		try {
     			//1 获取mybatis-config.xml的输入流
     			InputStream is = Resources.getResourceAsStream(resource);
     			//2 创建SqlSessionFactory对象，完成对配置文件的读取
     			SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
     			//3 创建sqlSession
     			sqlSession = factory.openSession();
     			//4 调用mapper文件来对数据进行操作，必须先把mapper文件引入到mybatis-config.xml中
     			count = sqlSession.selectOne("cn.smbms.dao.provider.ProviderMapper.count");
     			logger.debug("ProviderMapperTest count---> " + count);
     		} catch (IOException e) {
     			// TODO Auto-generated catch block
     			e.printStackTrace();
     		}finally{
     			sqlSession.close();
     		}
     	}
     
     }
     
     

5. 测试运行

   • 右键ProviderMapperTest——>run as——>Junit Test

     

6. 查看输出结果

   • 查看运行结果