IBatis3.0 注解配置方式的应用（JPA+IBatis3.0应用注解版）

         其实使用IBatis3.0注解，相等于把IBatis中的全局xml配置信息编程式开发，非全局xml配置针对实体的映射文件采用。注解开发，好了，言归正传吧。\(^o^)/~

IbatisSessionFactory 的代码重点如下：

注意看有颜色部分代码：

 

package com.vnvtrip.search.ibatis.utils;

import java.sql.Connection;
import java.util.Properties;
import java.util.logging.Logger;

import javax.sql.DataSource;

import org.apache.commons.dbcp.BasicDataSourceFactory;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.apache.ibatis.session.TransactionIsolationLevel;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;

import com.vnvtrip.search.ibatis.blog.model.BlogMapper;

/**
 * 
 * 
 * 创建类似Hibernate的HibernateSessionFactoryUtils的类
 * @author longgangbai
 * 
 */
@SuppressWarnings("serial")
public class IbatisSessionFactory implements SqlSessionFactory {
    
    public static final Logger LOG = Logger.getLogger(IbatisSessionFactory.class.getName());

    /**
     * 针对特殊的应用
     * 读取config.properties文件，存放了数据库连接参数等信息 
     */
    private static final Properties props = new Properties() {
	{
	    try {
		load(IbatisSessionFactory.class.getResourceAsStream("jdbc.properties"));
	    } catch (Exception e) {
		e.printStackTrace();
	    }
	}
    };
    
    /** 根据参数得到某个具体的iBatis数据源工厂实例 */
    public static SqlSessionFactory getInstance() {
	if (sqlSessionFactory == null) {
	    try {
		initSqlSessionFactory();
	    } catch (Exception e) {
		e.printStackTrace();
	    }
	}
	return sqlSessionFactory;
    }
   /**
    * 采用注解配置的方式
    * @throws Exception
    */
    private static void initSqlSessionFactory() throws Exception {
	//获取数据源    
	DataSource datasource = BasicDataSourceFactory.createDataSource(props);
	    //创建事务工厂
	TransactionFactory transFactory = new JdbcTransactionFactory();
	//获取上下文环境
	Environment environment = new Environment("development",
	transFactory, datasource);
	//创建配置对象
	Configuration config = new Configuration(environment);
	//添加映射的类
	config.addMapper(BlogMapper.class);
	//构建的会话工厂
	SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
	sqlSessionFactory = builder.build(config);

    }

    // 真正“做事”的实例
    private static SqlSessionFactory sqlSessionFactory = null;

    public Configuration getConfiguration() {
	return sqlSessionFactory.getConfiguration();
    }

    public SqlSession openSession() {
	return sqlSessionFactory.openSession();
    }

    public SqlSession openSession(boolean arg0) {
	return sqlSessionFactory.openSession(arg0);
    }

    public SqlSession openSession(Connection arg0) {
	return sqlSessionFactory.openSession(arg0);
    }

    public SqlSession openSession(ExecutorType arg0) {
	return sqlSessionFactory.openSession(arg0);
    }

    public SqlSession openSession(ExecutorType arg0, boolean arg1) {
	return sqlSessionFactory.openSession(arg0, arg1);
    }

    public SqlSession openSession(ExecutorType arg0, Connection arg1) {
	return sqlSessionFactory.openSession(arg0, arg1);
    }

    @Override
    public SqlSession openSession(TransactionIsolationLevel arg0) {
	return sqlSessionFactory.openSession(arg0);
    }

    @Override
    public SqlSession openSession(ExecutorType arg0,
	    TransactionIsolationLevel arg1) {
	return sqlSessionFactory.openSession(arg0, arg1);
    }
}

 

 jdbc.properties内容如下：

 

driverClassName=com.mysql.jdbc.Driver
url=jdbc\:mysql\://localhost\:3306/search
username=root
password=123456

 

 

Blog对应的映射文件Mapper文件：

针对insert，update，delete，select很简单忽略。

 

package com.vnvtrip.search.ibatis.blog.model;

import org.apache.ibatis.annotations.Select;
/**
 *
 * @author longgangbai
 *
 */
public interface BlogMapper {
    @Select("select * from blog where blogid=#{blogid}")
    Blog findById(int id);
}

 

BlogDAO中的代码如下：

    @Override
    public Blog findById(Integer id) {
  try {
      BlogMapper mapper=getSqlSession().getMapper(BlogMapper.class);
      return mapper.findById(id);
 } finally{
     getSqlSession().close();
 }
    }