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PHP的mysqli_query参数MYSQLI_STORE_RESULT和MYSQLI_USE_RESULT的区别 - 站长搜索
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PHP的mysqli_query参数MYSQLI_STORE_RESULT和MYSQLI_USE_RESULT的区别

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2014-12-12 12:03:04 转载来源: 网络整理/侵权必删

本文主要为大家讲解了PHP的mysql操作函数mysqli_query参数MYSQLI_STORE_RESULT和MYSQLI_USE_RESULT的区别,本文给出了这两个参数的5个区别,需要的朋友可以参考下 虽然nosql变得流行,但是我感觉sql还是主流 今天在翻php manul的时候,发现mysqli 的查询可以传递一个有意思的参数 代码如下: @mysqli_query($this->sql,$SQL,($method ? MYSQLI_USE_RESULT : MYSQLI_STORE_RESULT));   在php manul上面对这两个参数是这样解释的。   代码如下: Either the constant MYSQLI_USE_RESULT or MYSQLI_STORE_RESULT depending on the desired behavior. By default, MYSQLI_STORE_RESULT is used.   如果什么也不传,那就

本文主要为大家讲解了PHP的mysql操作函数mysqli_query参数MYSQLI_STORE_RESULT和MYSQLI_USE_RESULT的区别,本文给出了这两个参数的5个区别,需要的朋友可以参考下

虽然nosql变得流行,但是我感觉sql还是主流
今天在翻php manul的时候,发现mysqli 的查询可以传递一个有意思的参数

代码如下:

@mysqli_query($this->sql,$SQL,($method ? MYSQLI_USE_RESULT : MYSQLI_STORE_RESULT));

 

在php manul上面对这两个参数是这样解释的。

 

代码如下:

Either the constant MYSQLI_USE_RESULT or MYSQLI_STORE_RESULT depending on the desired behavior. By default, MYSQLI_STORE_RESULT is used.

 

如果什么也不传,那就默认为MYSQLI_STORE_RESULT。

在phpmanul上面有人说了这样一句话If we have to retrieve large amount of data we use MYSQLI_USE_RESULT

其实这两个参数的区别还是很大的。

(1)区别在于从服务器上检索结果集的行。
(2)MYSQLI_USE_RESULT 启动查询,但实际上并未获取任何行
(3)MYSQLI_STORE_RESULT 立即检索所有的行
(4)MYSQLI_STORE_RESULT 从服务器上检索结果集时,就提取了行,并为之分配内存,存储到客户机中,随后调用 mysqli_fetch_array()就再也不会返回错误,因为它仅仅是把行脱离了已经保留结果集的数据结构,mysqli_fetch_array()返回 NULL始终表示已经到达结果集的末端。
(5)MYSQLI_USE_RESULT 本身不检索任何行,而只是启动一个逐行的检索,就是说必须对每行调用 mysqli_fetch_array()来自己完成。既然如此,虽然正常情况下,mysqli_fetch_array()返回NULL仍然表示此时已到达结果集的末端,但也可能表示在与服务器通信时发生错误。

总结

与MYSQLI_USE_RESULT相比,MYSQLI_STORE_RESULT 有着较高的内存和处理需求,因为是在客户机上维护整个结果集,所以内存分配和创建数据结构的耗费是非常巨大的,如果想一次检索多个行,可用 MYSQLI_USE_RESULT。

MYSQLI_USE_RESULT有着较低的内存需求,因为只需给每次处理的单行分配足够的空间。这样速度就较快,因为不必为结果集建立复杂的数据结构。另一方面,MYSQLI_USE_RESULT把较大的负载加到了服务器上,它必须保留结果集中的行,直到客户机看起来适合检索所有的行。


标签: MYSQLI RESULT PHP mysqli query 参数 STORE USE 区别


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