Ibatis的容易配置和使用（学习中的笔记）

Ibatis的简单配置和使用（学习中的笔记）

1、将支持包ibatis-2.3.0.677.jar拷贝到lib下

 

2、加入 sqlmapconfig.xml 核心配置文件到 src 下

 

3、修改核心配置文件，将数据库连接写好。

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE sqlMapConfig      
    PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"      
    "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">

<sqlMapConfig>

	<!--
		commitRequired主要进行事务处理。
		false表示自动事务处理。
	-->
	<transactionManager type="JDBC" commitRequired="true">
		<dataSource type="SIMPLE">
			<property name="JDBC.Driver" value="org.gjt.mm.mysql.Driver" />
			<property name="JDBC.ConnectionURL" value="jdbc:mysql://localhost:3306/test" />
			<property name="JDBC.Username" value="root" />
			<property name="JDBC.Password" value="mysqladmin" />
		</dataSource>
	</transactionManager>

	<!--
		配置映射文件
	-->
	<sqlMap resource="cn/mldn/ibatis/vo/News.xml" />

</sqlMapConfig>

4、修改News.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE sqlMap      
    PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"      
    "http://ibatis.apache.org/dtd/sql-map-2.dtd">

<sqlMap namespace="News">

	<!-- 定义别名，为要映射的包.类名，定义一个别名，方便使用 -->
	<typeAlias alias="News" type="cn.mldn.ibatis.vo.News" />

	<!--
		对返回结果集进行映射。
	-->
	<resultMap id="NewsResult" class="News">
		<result property="id" column="id" />
		<result property="title" column="title" />
		<result property="content" column="content" />
		<result property="counts" column="counts" />
		<result property="postDate" column="post_date" />
	</resultMap>

	<!--
		所有的操作语句都必须定义在映射文件中。 
		查询全部 
		id：表示调用这个语句时的唯一标识
		resultMap：表示返回多条数据，数据按照上面定义的映射来进行转换。
	-->
	<select id="findAllNews" resultMap="NewsResult">
		select * from news
 	</select>

	<!--
		按id查询
		parameterClass：传入的参数类型
		resultClass：表示查询结果为一条数据，类型为News
		当参数只有一个时，名字任意定义。
	-->
	<select id="findNewsById" parameterClass="int" resultClass="News">
		select * from news WHERE id = #id#
	</select>

	<!-- 
		添加操作
		由于需要传递多个参数，因此参数名要与News对象中的属性对应。
	 -->
	<insert id="saveNews" parameterClass="News">
		insert into news (title,content,counts,post_date) VALUES 
		(#title#,#content#,#counts#,#postDate#)
  </insert>

	<!-- 修改 -->
	<update id="updateNews" parameterClass="News">
		update news SET title = #title#,content = #content#,counts = #counts# 
		WHERE id = #id#
  </update>

	<!-- 按id删除-->
	<delete id="deleteNewsById" parameterClass="int">
		delete from
		news where id = #id#
  </delete>

</sqlMap>

5、创建 SqlMapSessionFactory类

package cn.mldn.ibatis.dbc;

import java.io.Reader;
import java.sql.SQLException;

import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import com.ibatis.sqlmap.client.SqlMapSession;

public class SqlMapSessionFactory {

	private static String CONFIG_FILE_LOCATION = "SqlMapConfig.xml";
	private static final ThreadLocal<SqlMapSession> threadLocal = new ThreadLocal<SqlMapSession>();
	private static SqlMapClient client;
	private static String configFile = CONFIG_FILE_LOCATION;

	static {
		try {
			Reader reader = Resources.getResourceAsReader(CONFIG_FILE_LOCATION);
			client = SqlMapClientBuilder.buildSqlMapClient(reader);
			reader.close();
		} catch (Exception e) {
			System.err.println("%%%% Error Creating SessionFactory %%%%");
			e.printStackTrace();
		}
	}

	private SqlMapSessionFactory() {
	}

	public static SqlMapSession getSession() throws SQLException {
		SqlMapSession session = (SqlMapSession) threadLocal.get();

		if (session == null || session.getCurrentConnection() == null
				|| session.getCurrentConnection().isClosed()) {
			session = client.openSession();
			threadLocal.set(session);
		}

		return session;
	}


	public static void closeSession() {
		SqlMapSession session = (SqlMapSession) threadLocal.get();
		threadLocal.set(null);

		if (session != null) {
			session.close();
		}
	}

5、编写实现类（接口就不贴了）

package cn.mldn.ibatis.dao.impl;

import java.util.List;

import cn.mldn.ibatis.dao.NewsDAO;
import cn.mldn.ibatis.dbc.SqlMapSessionFactory;
import cn.mldn.ibatis.vo.News;

public class NewsDAOImpl implements NewsDAO {

	public boolean doCreate(News news) throws Exception {
		SqlMapSessionFactory.getSession().insert("saveNews", news);
		return true;
	}

	public boolean doDelete(int id) throws Exception {
		SqlMapSessionFactory.getSession().delete("deleteNewsById", id);
		return true;
	}

	public boolean doUpdate(News news) throws Exception {
		SqlMapSessionFactory.getSession().update("updateNews", news);
		return true;
	}

	public List<News> findAll() throws Exception {
		List all = SqlMapSessionFactory.getSession()
				.queryForList("findAllNews");
		return all;
	}

	public News findById(int id) throws Exception {
		News news = (News) SqlMapSessionFactory.getSession().queryForObject(
				"findNewsById", id);
		return news;
	}

}

 

package cn.mldn.ibatis.service.impl;

import java.sql.SQLException;
import java.util.List;

import cn.mldn.ibatis.dao.NewsDAO;
import cn.mldn.ibatis.dao.impl.NewsDAOImpl;
import cn.mldn.ibatis.dbc.SqlMapSessionFactory;
import cn.mldn.ibatis.service.NewsService;
import cn.mldn.ibatis.vo.News;

public class NewsServiceImpl implements NewsService {

	private NewsDAO newsdao = new NewsDAOImpl();

	public boolean doCreate(News news) {
		boolean flag = false;
		try {
			SqlMapSessionFactory.getSession().startTransaction();
			flag = this.newsdao.doCreate(news);
			SqlMapSessionFactory.getSession().commitTransaction();
		} catch (Exception e) {
			e.printStackTrace();
			try {
				SqlMapSessionFactory.getSession().endTransaction();
			} catch (SQLException e1) {
			}
		} finally {
			SqlMapSessionFactory.closeSession();
		}
		return flag;
	}

	public boolean doDelete(int id) {
		boolean flag = false;
		try {
			SqlMapSessionFactory.getSession().startTransaction();
			flag = this.newsdao.doDelete(id);
			SqlMapSessionFactory.getSession().commitTransaction();
		} catch (Exception e) {
			e.printStackTrace();
			try {
				SqlMapSessionFactory.getSession().endTransaction();
			} catch (SQLException e1) {
			}
		} finally {
			SqlMapSessionFactory.closeSession();
		}
		return flag;
	}

	public boolean doUpdate(News news) {
		boolean flag = false;
		try {
			SqlMapSessionFactory.getSession().startTransaction();
			flag = this.newsdao.doUpdate(news);
			SqlMapSessionFactory.getSession().commitTransaction();
		} catch (Exception e) {
			e.printStackTrace();
			try {
				SqlMapSessionFactory.getSession().endTransaction();
			} catch (SQLException e1) {
			}
		} finally {
			SqlMapSessionFactory.closeSession();
		}
		return flag;
	}

	public List<News> findAll() {
		List all = null;
		try {
			all = this.newsdao.findAll();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			SqlMapSessionFactory.closeSession();
		}
		return all;
	}

	public News findById(int id) {
		News news = null;
		try {
			news = this.newsdao.findById(id);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			SqlMapSessionFactory.closeSession();
		}
		return news;
	}