在MySQLi中选择* FROM [英] SELECT * FROM in MySQLi

问题描述

我的网站范围很广，最近我刚改用PHP5(称我为后期爱好者).

My site is rather extensive, and I just recently made the switch to PHP5 (call me a late bloomer).

我之前所有的MySQL查询都是这样构建的:

All of my MySQL query's before were built as such:

"SELECT * FROM tablename WHERE field1 = 'value' && field2 = 'value2'";

这使它变得非常容易，简单和友好.

This made it very easy, simple and friendly.

出于明显的安全性原因，我现在正尝试切换到mysqli，并且在bind_param需要特定参数时，我很难弄清楚如何实现相同的SELECT * FROM查询.

I am now trying to make the switch to mysqli for obvious security reasons, and I am having a hard time figuring out how to implement the same SELECT * FROM queries when the bind_param requires specific arguments.

此声明是否已成为过去?

Is this statement a thing of the past?

如果是，该如何处理涉及大量列的查询?我真的需要每次都把它们全部打出来吗?

If it is, how do I handle a query with tons of columns involved? Do I really need to type them all out every time?

推荐答案

"SELECT * FROM tablename WHERE field1 = 'value' && field2 = 'value2'";

成为

"SELECT * FROM tablename WHERE field1 = ? && field2 = ?";

传递给$mysqli::prepare的

:

$stmt = $mysqli->prepare(
  "SELECT * FROM tablename WHERE field1 = ? && field2 = ?");
$stmt->bind_param( "ss", $value, $value2); 
// "ss' is a format string, each "s" means string
$stmt->execute();

$stmt->bind_result($col1, $col2);
// then fetch and close the statement

OP评论:

因此，如果我有5个参数，则可能会有"sssis"之类的东西(取决于输入的类型?)

so if i have 5 parameters, i could potentially have "sssis" or something (depending on the types of inputs?)

对，在prepared语句中每个?参数有一个类型说明符，它们都在位置(第一个说明符适用于第一个?，并由第一个实际参数(它是bind_param的第二个参数)替换)

Right, one type specifier per ? parameter in the prepared statement, all of them positional (first specifier applies to first ? which is replaced by first actual parameter (which is the second parameter to bind_param)).

mysqli将负责转义和引用(我认为).

mysqli will take care of escaping and quoting (I think).

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