问题描述
我设法使用__toString()魔术方法打印一个字符串,但是在这个字符串中,我看到占位符(对于条件参数),并且它不能用作SQL查询。
I managed to print a string using __toString() magic method, but in this string I see placeholders (for conditions params), and it doesn't work as SQL query.
我检查过这个对象也是google,但是找不到工作的答案。
I checked documentation of this object, and also looked in google, but couldn't find a working answer.
推荐答案
根据问题的意见(谢谢@Scuzzy的灵感)我写了一些简单的代码来转换 SelectQuery
对象:
Basing on question's comments (thanks @Scuzzy for inspiration) I wrote some simple piece of code to convert SelectQuery
object:
class ExportableSelectQuery {
public static function toSql(SelectQuery $obj) {
$_string = $obj->__toString();
$_conditions = $obj->conditions();
$_tables = $obj->getTables();
$_fields = $obj->getFields();
foreach($_tables as $k => $t) {
if(!empty($t['alias'])) {
$_string = str_replace('{' . $t['table'] . '}', $t['table'] . ' as', $_string);
}
else {
$_string = str_replace('{' . $t['table'] . '}', $t['table'], $_string);
}
}
foreach($_conditions as $k => $c) {
if(is_int($c['value'])) {
$_string = str_replace(':db_condition_placeholder_' . $k, $c['value'], $_string);
}
else {
$_string = str_replace(':db_condition_placeholder_' . $k, "'" . $c['value'] . "'", $_string);
}
}
//echo('<pre>');
//var_dump($_fields);
//var_dump($_conditions);
//var_dump($_tables);
//var_dump($_string);
//echo('</pre>');
//die();
return $_string;
}
}
此代码的使用现在很简单(如果只有$ SelectQuery
对象某处):
Usage of this code is now simple (if you only have SelectQuery
object somewhere):
die(ExportableSelectQuery::toSql($query));
我正在考虑扩展原始 SelectQuery
对象,并提供获取SQL代码的方法,但Drupal的 db_select
函数返回 SelectQuery
,所以我必须更改 db_select
函数或将返回的对象转换为 ExportableSelectQuery
。
I was thinking about extending original SelectQuery
object, and provide method to get SQL code, but Drupal's db_select
function returns SelectQuery
, so I will have to either change db_select
function or cast returned object to ExportableSelectQuery
.
还这可能不是我可以写的最好的解决方案,但是假设时间和目的的限制解决了我的问题,只要罚款。
Also this is not probably best solution I could write, but assuming limit of time and purpose it solved my problem just fine.
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