Ibatis搭建及配置

       Ibatis持久层框架是MyBatis的前身， 在springMVC中Ibatis与MyBatis使用不同，必须实现dao层，之前由于dao层没有实现出现了许多bug，这个地方比较容易出错。MyBatis中mapper接口与xml文件之间通过namespace一一对应进行绑定，Ibtis中namespace不是必要的，通过id将方法与xml文件sql语句的执行相关联，Ibatis中dao层方法的return语句写法上也有讲究。

        pom配置文件：

                
		
			org.apache.ibatis
			ibatis-sqlmap
			2.3.4.726
		

		
		
			mysql
			mysql-connector-java
			5.1.38
		

    db.properties数据库配置文件

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/sim?useUnicode=true&characterEncoding=utf8
username=root
password=uroot

    dao层配置

SqlMapConfig.xml

BaseDao 重要 不实现会报错

public class BaseDao extends SqlMapClientDaoSupport{
	//通过bean名称注入   
    @Resource(name="sqlMapClient")  
    private SqlMapClient sqlMapClient; 
    
    //完成sqlMapClient初始化工作   
    @PostConstruct  
    public void initSqlMapClient(){  
        super.setSqlMapClient(sqlMapClient);  
    }  
}

UserDao继承BaseDao

@Component  //将UserDao类注入到bean里面 
public class UserDao extends BaseDao{
	//找到所有未删除的用户
	//告诉编译器忽略指定的警告，不用在编译完成后出现警告信息。
	@SuppressWarnings("unchecked")  
	public List selectUsers() throws Exception{  
		return getSqlMapClientTemplate().queryForList("selectUsers");
	}
	//根据用户名寻找用户
	public User getUserByName(String name) throws Exception{  
		return (User) getSqlMapClientTemplate().queryForObject("findUserByName",name);  
	}  
	//根据id删除用户
	public boolean deleteUser(int id) throws Exception{  
		int result = getSqlMapClientTemplate().delete("deleteUser", id);  
		return result > 0 ? true : false;  
	} 
}

映射文件UserMapper.xml

 

	
	
	
		select
			id,
			name,
			real_name as realName,
			email,
			address,
			create_time as createTime,
			is_delete as isDelete
		from
			querry
		where
			is_delete=0;
	
	
	        
		select
			id,
			name,
			real_name as realName,
			email,
			address,
			create_time as createTime,
			is_delete as isDelete
		from
			querry
		where
			is_delete=0
		and	
			name=#name#;
     
	
	    
        update 
        	querry  
        set
            is_delete=1  
        where 
        	id=#id#  
      

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SqlMapConfig.xml 中配置数据库连接不一样