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Home Backend Development PHP Tutorial 为什么执行插入sql语句,echo就失效了

为什么执行插入sql语句,echo就失效了

Jun 23, 2016 pm 01:38 PM

我执行插入语句的方法是

       function execute_data($sql){		$result = @mysql_query($sql) or die(mysql_error());		@mysql_free_result($result) or die(mysql_error());		return $result;	}
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 $sql = "insert into test(name) values('$name')"; if(execute_data($sql)) {     echo 'ok';}
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这样的,我这样插入语句是已经执行了, 已经插入到数据库的表中,但是echo却没有输出到网页上。。是什么原因?
用其他方法执行查询语句的话 echo可以输出到网页上。

执行查询语句的方法
	function get_js_array($sql){		$result = @mysql_query($sql) or die(mysql_error());		$arr = array();		while($row = @mysql_fetch_array($result, MYSQL_ASSOC)){			$arr[] = $row;  		}		$js = json_encode($arr);		mysql_free_result($result);		return $js;	}
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回复讨论(解决方案)

函数execute_data的返回值$result被函数mysql_free_result释放掉了返回出去就是null了吧

把$result打印出来看看是不是为假

把$result打印出来看看是不是为假



不为假吧。  我都成功插入了。  只是echo输出不出来。

mysql_free_result

你都释放掉了还有返回?

mysql_query($sql) 对于 insert 指令只返回逻辑值
因此 mysql_free_result($result) 会报错:$result 不是有效的资源
但是你屏蔽了 php 错误信息,而 die(mysql_error()) 只是终止程序,因为 sql 指令并没有错(mysql_error() 返回空串)

mysql_query($sql) 对于 insert 指令只返回逻辑值
因此 mysql_free_result($result) 会报错:$result 不是有效的资源
但是你屏蔽了 php 错误信息,而 die(mysql_error()) 只是终止程序,因为 sql 指令并没有错(mysql_error() 返回空串)



那我有什么办法可以让他输出出来吗?

注释掉 @mysql_free_result($result) or die(mysql_error()); 这句

注释掉 @mysql_free_result($result) or die(mysql_error()); 这句


谢谢,解决了!
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