PHP MVC初学者问题...

		function postedit(){			$this->load->helper("url");			$this->load->helper("form");			//$sql = "select * from userinfo where username = 'zhangning'";			$data["user"] = $this->db->query("select * from userinfo where username = '".$this->uri->segment(3)."'");						$this->load->view("postedit",$data);		}

前台：

<?php echo $user->Age ?>

A PHP Error was encountered

Severity: Notice

Message: Undefined property: CI_DB_mysql_result::$Age

Filename: views/postedit.php

Line Number: 9

啥原因呀？找了半天了。。。刚学2 3天。。看不出来哪有错。
$data["user"] ="fsdfsd";如果这样前台会输出值得

回复讨论(解决方案)

这个错可以不理会，定义一下错误级别就行了。
你的query只是查询，并未返回结果啊，你看看ci手册

这个错可以不理会，定义一下错误级别就行了。
你的query只是查询，并未返回结果啊，你看看ci手册
你说的该不会是这个吧
在System文件下下的DataBase文件夹下

/**	 * Execute the query	 *	 * Accepts an SQL string as input and returns a result object upon	 * successful execution of a "read" type query.  Returns boolean TRUE	 * upon successful execution of a "write" type query. Returns boolean	 * FALSE upon failure, and if the $db_debug variable is set to TRUE	 * will raise an error.	 *	 * @access	public	 * @param	string	An SQL query string	 * @param	array	An array of binding data	 * @return	mixed	 */	function query($sql, $binds = FALSE, $return_object = TRUE)	{		if ($sql == '')		{			if ($this->db_debug)			{				log_message('error', 'Invalid query: '.$sql);				return $this->display_error('db_invalid_query');			}			return FALSE;		}		// Verify table prefix and replace if necessary		if ( ($this->dbprefix != '' AND $this->swap_pre != '') AND ($this->dbprefix != $this->swap_pre) )		{			$sql = preg_replace("/(\W)".$this->swap_pre."(\S+?)/", "\\1".$this->dbprefix."\\2", $sql);		}		// Compile binds if needed		if ($binds !== FALSE)		{			$sql = $this->compile_binds($sql, $binds);		}		// Is query caching enabled?  If the query is a "read type"		// we will load the caching class and return the previously		// cached query if it exists		if ($this->cache_on == TRUE AND stristr($sql, 'SELECT'))		{			if ($this->_cache_init())			{				$this->load_rdriver();				if (FALSE !== ($cache = $this->CACHE->read($sql)))				{					return $cache;				}			}		}		// Save the  query for debugging		if ($this->save_queries == TRUE)		{			$this->queries[] = $sql;		}		// Start the Query Timer		$time_start = list($sm, $ss) = explode(' ', microtime());		// Run the Query		if (FALSE === ($this->result_id = $this->simple_query($sql)))		{			if ($this->save_queries == TRUE)			{				$this->query_times[] = 0;			}			// This will trigger a rollback if transactions are being used			$this->_trans_status = FALSE;			if ($this->db_debug)			{				// grab the error number and message now, as we might run some				// additional queries before displaying the error				$error_no = $this->_error_number();				$error_msg = $this->_error_message();				// We call this function in order to roll-back queries				// if transactions are enabled.  If we don't call this here				// the error message will trigger an exit, causing the				// transactions to remain in limbo.				$this->trans_complete();				// Log and display errors				log_message('error', 'Query error: '.$error_msg);				return $this->display_error(										array(												'Error Number: '.$error_no,												$error_msg,												$sql											)										);			}			return FALSE;		}		// Stop and aggregate the query time results		$time_end = list($em, $es) = explode(' ', microtime());		$this->benchmark += ($em + $es) - ($sm + $ss);		if ($this->save_queries == TRUE)		{			$this->query_times[] = ($em + $es) - ($sm + $ss);		}		// Increment the query counter		$this->query_count++;		// Was the query a "write" type?		// If so we'll simply return true		if ($this->is_write_type($sql) === TRUE)		{			// If caching is enabled we'll auto-cleanup any			// existing files related to this particular URI			if ($this->cache_on == TRUE AND $this->cache_autodel == TRUE AND $this->_cache_init())			{				$this->CACHE->delete();			}			return TRUE;		}		// Return TRUE if we don't need to create a result object		// Currently only the Oracle driver uses this when stored		// procedures are used		if ($return_object !== TRUE)		{			return TRUE;		}		// Load and instantiate the result driver		$driver			= $this->load_rdriver();		$RES			= new $driver();		$RES->conn_id	= $this->conn_id;		$RES->result_id	= $this->result_id;		if ($this->dbdriver == 'oci8')		{			$RES->stmt_id		= $this->stmt_id;			$RES->curs_id		= NULL;			$RES->limit_used	= $this->limit_used;			$this->stmt_id		= FALSE;		}		// oci8 vars must be set before calling this		$RES->num_rows	= $RES->num_rows();		// Is query caching enabled?  If so, we'll serialize the		// result object and save it to a cache file.		if ($this->cache_on == TRUE AND $this->_cache_init())		{			// We'll create a new instance of the result object			// only without the platform specific driver since			// we can't use it with cached data (the query result			// resource ID won't be any good once we've cached the			// result object, so we'll have to compile the data			// and save it)			$CR = new CI_DB_result();			$CR->num_rows		= $RES->num_rows();			$CR->result_object	= $RES->result_object();			$CR->result_array	= $RES->result_array();			// Reset these since cached objects can not utilize resource IDs.			$CR->conn_id		= NULL;			$CR->result_id		= NULL;			$this->CACHE->write($sql, $CR);		}		return $RES;	}

db类是放在那个地方，你只要看手册教程乍样读就行了。

$user->Age 改作 $user->age

php 的变量名、对象的属性名、数组的关联键是区分大小写的
你的 $user->Age 是查询结果（$data["user"] = $this->db->query("select * from use ....）
如果能写成这样的话，那么对应的字段名一定也要是 Age，但一般都不这么写，只是习惯性的一律小写

好啦。我知道啥原因啦。
还是自己不熟悉php原因
这些东西应该多看CI 多练就行 

灰常感谢2位！！