[英]Query for PHP/MySql AND/OR for an advanced search
我是php和mysql的新手,因此我的查詢需要一些幫助。 這是我的SQL查詢
SELECT * FROM table1 WHERE (Name LIKE '%$keyword%' OR ZipCode LIKE '%$keyword%') AND Category LIKE '$category' AND Country LIKE '$country' LIMIT $start, $limit
現在我想做的是
用更簡單的話說,如果選擇了things關鍵字,country或category之一,則搜索將相應地顯示結果。 此外,如果所有字段都輸入,它也應該起作用。 我設法完成了一半,但有時會給我錯誤的結果。 請幫忙。
您可以檢查設置了哪些字段,並在運行時相應地進行查詢。 您可以執行以下操作:
$query = "";
$keyword = $_REQUEST['keyword'];
$country = $_REQUEST['country'];
$category = $_REQUEST['category'];
if(isset($keyword)){//if keyword set goes here
$query = "SELECT * FROM table1 WHERE Name LIKE '%$keyword%' OR ZipCode LIKE '%$keyword%' OR country LIKE '%$keyword%'";
if(isset($category)){
$query .= "AND category LIKE '$category'";
}
if(isset($country)){
$query . = "AND country LIKE '$country'"
}
}else if (isset($category)){ //if keyword not set but category set then goes here
$query = "SELECT * FROM table1 WHERE category LIKE '$category'";
if(isset($country)){
$query . = "AND country LIKE '$country'";
}
}else if(isset($country)){//if only country set goes here
$query = "SELECT * FROM table1 WHERE country LIKE '$country'"
}
我建議使用幾個不同的查詢(每個搜索參數組合一個),使用php決定使用哪個查詢或使用php動態構建一個查詢。
請注意,使用以%開頭的like可能會非常慢。
如果您真的想做一個聲明(我不建議這樣做),那么:-
SELECT *
FROM table1
WHERE (Name LIKE '%$keyword%' OR ZipCode LIKE '%$keyword%' OR '$keyword' = '')
AND (Category = '$category' OR '$category' = '' )
AND (Country = '$country' OR '$country' = '' )
LIMIT $start, $limit
或動態構建
$ConditionArray = array();
if ($keyword != '') $ConditionArray[] = "(Name LIKE '%$keyword%' OR ZipCode LIKE '%$keyword%' OR '$keyword' = '')";
if ($category != '') $ConditionArray[] = "Category = '$category'";
if ($country != '') $ConditionArray[] = "Country = '$country'";
if (count($ConditionArray) > 0)
{
$query = "
SELECT *
FROM table 1
WHERE ".implode(' AND ', $ConditionArray);
}
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