使用不同数量的搜索键在数据库中搜索客户

Question

找到了其他一些帖子，但没有一个对我有真正的帮助（也许我太笨了，无法搜索）。甚至在键入此内容时 Similar Questions 块也无济于事。

这是我的问题： 我有一个 mysql 数据库，有 4 列：id、first-name、last-name、city

在一个 php 应用程序上，我有一个输入字段，它通过 AJAX 查询 php 脚本以搜索数据库。如果只给出 1 个搜索词，例如名字，则此字段有效。当我尝试 2 或 3 个搜索词时，我不知道如何查询数据库。

请帮助我如何查询我的数据库（大约有 20,000 行）。 一些搜索示例： Thomas Boston Michael Smith New York Doe, Jane Orlando, Michael 预期结果是包含任何这些搜索词的所有行。最好是按相似度排序（首先找到大多数术语）。使用DIFFERENCE() 也不错，但我的脚本是德语的......

我已经阅读了有关全文搜索的资料，但不知道该怎么做。

这是我当前的查询代码（1 个搜索词）：

$key = $_GET['key'];
//Here will be something to filter all non numbers/letters and change them to a space for $key
$keys = explode(" ",$key); //$keys is not in use yet
$prep_stmt = "
SELECT 
    id, last-name, first-name, city 
FROM 
    customers 
WHERE 
    last-name LIKE concat('%', ? ,'%') OR
    first-name LIKE concat('%', ? ,'%')  OR
    city LIKE concat('%', ? ,'%') 
ORDER BY 
    last-name ASC";
$stmt = $mysqli->prepare($prep_stmt);
$stmt->bind_param('sss', $key, $key, $key);

关于安全性：此代码在内部环境中运行。所以安全不是最重要的。

PS：我的母语不是英语，但我已经尽力了。

---

我找到的东西，但没有帮助：

• Performing a search on first and last name columns with a single search string that has more than 2 words
• Searching full name or first or last name in MySQL database with first and last name in separate columns
• Search with full name instead of just first name or last name
• Live search on first, middle and last name
• Search Database by First and Last Name
• MySQL Search For Names - Separated by Space

---

~~编辑~~

我想出的东西，但没有用：

$key = trim(preg_replace( '/\s+/', ' ', preg_replace("/[^[:alnum:][:space:]]/u", ' ', $key)));

SELECT
    id, last-name, first-name, city 
FROM
    customers
WHERE
    last-name LIKE concat('%', REPLACE( ? ,' ','%') ,'%') OR
    first-name LIKE concat('%', REPLACE( ? ,' ','%') ,'%') OR
    city LIKE concat('%', REPLACE( ? ,' ','%') ,'%')                
ORDER BY
    name ASC

Answer 1

感谢 Rogier Bruggeman，我知道了如何解决我的问题。我就是这样解决的：

$key = $_GET['key'];
$key = trim(preg_replace( '/\s+/', ' ', preg_replace("/[^[:alnum:][:space:]]/u", ' ', $key)));
$keys = explode(" ",$key);
$key_num = count($keys);
if(NOT RELEVANT == RELEVANT){
    NOT RELEVANT
} else {
    //prepare statement
    $prep_stmt = "SELECT id  FROM customers WHERE ";
    if($key_num == 1){
        $prep_stmt .= "
            lastname LIKE ? OR
            firstame LIKE ? OR
            zip LIKE ? OR
            city LIKE ?
        ORDER BY
            lastname ASC";
        $stmt = $mysqli->prepare($prep_stmt);
        $key = '%' . $key . '%';
        $stmt->bind_param('ssss', $key, $key, $key, $key);
    } else {
        $p = 0;
        foreach($keys as $v){
            if($p <> 0){
                $prep_stmt .= " AND ";
            }
            $prep_stmt .= "(lastname LIKE ? OR firstname LIKE ? OR zip LIKE ? OR city LIKE ? )";
            $p++;
        }
        $prep_stmt .= " ORDER BY name ASC";
        $stmt = $mysqli->prepare($prep_stmt);
        switch($key_num){
            case 2:
                $keys[0] = '%' . $keys[0] . '%';
                $keys[1] = '%' . $keys[1] . '%';
                $stmt->bind_param('ssssssss', $keys[0], $keys[0], $keys[0], $keys[0], $keys[1], $keys[1], $keys[1], $keys[1]);
                break;
            case 3:
                $keys[0] = '%' . $keys[0] . '%';
                $keys[1] = '%' . $keys[1] . '%';
                $keys[2] = '%' . $keys[2] . '%';
                $stmt->bind_param('ssssssssssss', $keys[0], $keys[0], $keys[0], $keys[0], $keys[1], $keys[1], $keys[1], $keys[1], $keys[2], $keys[2], $keys[2], $keys[2]);
                break;
            case 4:
                $keys[0] = '%' . $keys[0] . '%';
                $keys[1] = '%' . $keys[1] . '%';
                $keys[2] = '%' . $keys[2] . '%';
                $keys[3] = '%' . $keys[3] . '%';
                $stmt->bind_param('ssssssssssssssss', $keys[0], $keys[0], $keys[0], $keys[0], $keys[1], $keys[1], $keys[1], $keys[1], $keys[2], $keys[2], $keys[2], $keys[2], $keys[3], $keys[3], $keys[3], $keys[3]);
                break;
            case 5:
                $keys[0] = '%' . $keys[0] . '%';
                $keys[1] = '%' . $keys[1] . '%';
                $keys[2] = '%' . $keys[2] . '%';
                $keys[3] = '%' . $keys[3] . '%';
                $keys[4] = '%' . $keys[4] . '%';
                $stmt->bind_param('ssssssssssssssssssss', $keys[0], $keys[0], $keys[0], $keys[0], $keys[1], $keys[1], $keys[1], $keys[1], $keys[2], $keys[2], $keys[2], $keys[2], $keys[3], $keys[3], $keys[3], $keys[3], $keys[4], $keys[4], $keys[4], $keys[4]);
                break;
            case 6:
                $keys[0] = '%' . $keys[0] . '%';
                $keys[1] = '%' . $keys[1] . '%';
                $keys[2] = '%' . $keys[2] . '%';
                $keys[3] = '%' . $keys[3] . '%';
                $keys[4] = '%' . $keys[4] . '%';
                $keys[5] = '%' . $keys[5] . '%';
                $stmt->bind_param('ssssssssssssssssssssssss', $keys[0], $keys[0], $keys[0], $keys[0], $keys[1], $keys[1], $keys[1], $keys[1], $keys[2], $keys[2], $keys[2], $keys[2], $keys[3], $keys[3], $keys[3], $keys[3], $keys[4], $keys[4], $keys[4], $keys[4], $keys[5], $keys[5], $keys[5], $keys[5]);
                break;
            default:
                $stmt = "SELECT id FROM customer WHERE 1 LIKE 2";
                $stmt = $mysqli->prepare($prep_stmt);
        }

    }

它有点脏，但它有效。真的很脏是我default在switch

Answer 2

你需要循环 $keys 来扩展你的查询

$prep_stmt = "
    SELECT 
        id, last-name, first-name, city 
    FROM 
        customers 
    WHERE ";

foreach($key as $v)
{
    $prep_stmt .= " OR last-name LIKE concat('%'%') OR
    first-name LIKE concat('%', ? ,'%')  OR
    city LIKE concat('%', ? ,'%') OR  " ;
}
$prep_stmt .= " 1 
ORDER BY 
    last-name ASC
";

然后分别绑定每个参数，每个 ?

$p = 1;
foreach($key as $v)
{
    $stmt->bindParam($p++,$v);
    $stmt->bindParam($p++,$v);
    $stmt->bindParam($p++,$v);
}