我想逐行读取文件,但没有完全加载到内存中.
我的文件太大而无法在内存中打开,如果尝试这样做,我总是会出现内存错误.
文件大小为1 GB.
在一些现有代码上,我有以下语句(经过相当长的查询构建练习):
return $statement->fetchAll(
DBAL\FetchMode::CUSTOM_OBJECT,
PublishedLead::class
);
Run Code Online (Sandbox Code Playgroud)
该作品(到目前为止),但我现在都可以看到fetchAll(),并FetchMode都因为DBAL 2.11弃用:
// ResultStatement::fetchAll()
/*
* @deprecated Use fetchAllNumeric(), fetchAllAssociative()
* or fetchFirstColumn() instead.
*/
Run Code Online (Sandbox Code Playgroud)
// FetchMode
/*
* @deprecated Use one of the fetch- or iterate-related
* methods on the Statement
*/
Run Code Online (Sandbox Code Playgroud)
为了保持我的代码尽可能向前兼容,如何编写它以将结果提取到自定义对象中?我是否必须根据结果编写自定义保湿逻辑,或者 DBAL 可以为我做这件事吗?
当我发现这个奇怪的简写时,我正在浪费时间阅读underscore.string函数:
function count (str, substr) {
var count = 0, index;
for (var i = 0; i < str.length;) {
index = str.indexOf(substr, i);
index >= 0 && count++; //what is this line doing?
i = i + (index >= 0 ? index : 0) + substr.length;
}
return count;
}
Run Code Online (Sandbox Code Playgroud)
合法:在使用上述函数之前请三思而后,不要使用underscore.string
我把这条线放在这里,所以你不要浪费时间找到它:
index >= 0 && count++;
Run Code Online (Sandbox Code Playgroud)
我从未见过类似的东西.我无知在做什么.
关于MDN的弹性简写的文档说:
单值语法:值必须是以下之一:
Run Code Online (Sandbox Code Playgroud)a unitless <number>: then it is interpreted as <flex-grow>. a valid value for width: then it is interpreted as <flex-basis>. one of the keyword values none, auto, or initial.双值语法:第一个值必须是无单位的,并且它被解释为.第二个值必须是以下之一:
Run Code Online (Sandbox Code Playgroud)a unitless <number>: then it is interpreted as <flex-shrink>. a valid value for width: then it is interpreted as <flex-basis>.三值语法:
Run Code Online (Sandbox Code Playgroud)the first value must be a unitless <number> and it is interpreted as <flex-grow>. the second value must be a unitless <number> and it is interpreted as …
php ×3
css ×1
css3 ×1
dbal ×1
doctrine ×1
doctrine-orm ×1
flexbox ×1
html ×1
javascript ×1
shorthand ×1