Question

我想查询与MariaDB（InnoDB，utf8mb4_unicode_ci）匹配的条目。

它与不带变音符的搜索词一起使用，SQL代码甚至与phpmyadmin上的变音符一起使用。如果我使用变音符号，我会得到一个空数组。

// DB connection
$dboptions = array('charset=utf8mb4'); // with and without: no difference
$pdo = new PDO("mysql:host=$dbservername;dbname=$dbname", $dbusername, $dbpassword, $dboptions);

// Call
$pdo->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING );
$statement = $pdo->prepare(
"   SELECT
        Date(a_timestamp) AS thedate,
        count(a_timestamp) AS counted,
        a_comb_f
    FROM `$dbtable`
    WHERE Year(a_timestamp) >= '$chartyear'
    AND MATCH (a_comb_f) AGAINST ('+Müller' IN BOOLEAN MODE)
    GROUP BY thedate
    ORDER BY thedate
");
$statement->execute();
$result = $statement->fetchAll();
var_dump($result);

Müller的结果：

array(0) {}无法正常工作！

Example的结果：

有效！

thedate    | counted | a_comb_f
2008-08-20 | 1       | Test Example Test

纯SQL在phpmyadmin等中正常工作。

SELECT
        Date(a_timestamp) AS thedate,
        count(a_timestamp) AS counted,
        a_comb_f
    FROM `dbs4`
    WHERE Year(a_timestamp) >= '$chartyear'
    AND MATCH (a_comb_f) AGAINST ('+Müller' IN BOOLEAN MODE)
    GROUP BY thedate
    ORDER BY thedate

结果：

有效！

背景：

InnoDB, utf8mb4_unicode_ci
a_comb_f   Index   varchar(1000)   utf8mb4_unicode_ci

更新1

Indizes
Schlüsselname   Typ Unique  Gepackt Spalte  Kardinalität    Kollation   Null    Kommentar
a_comb_f    FULLTEXT    Nein    Nein    a_comb_f    141798      Nein

查询的列具有FULLTEXT索引。

Update2

我没有找到任何解决方案，所以我尝试使用mysqli而不是PDO来工作！

$conn = new mysqli($dbservername, $dbusername, $dbpassword, $dbname);
if ($conn->connect_error) {
    die("Connection Error " . $conn->connect_error);
}
if (!$conn->set_charset("utf8mb4")) {
    printf("Error loading utf8mb4: %s\n", $conn->error);
    exit();
}

$sql = 
"   SELECT
        Date(a_timestamp) AS thedate,
        count(a_timestamp) AS counted,
        a_comb_f
    FROM `$dbtable`
    WHERE Year(a_timestamp) >= '$chartyear'
    AND MATCH (a_comb_f) AGAINST ('+Müller' IN BOOLEAN MODE)
    GROUP BY thedate
    ORDER BY thedate
";
$result = mysqli_query($conn, $sql);
$result = mysqli_fetch_all($result, MYSQLI_ASSOC);

有人可以告诉我为什么它可以与mysqli一起使用而不与PDO一起使用吗？

PS：我知道代码包含漏洞（SQL注入）。它仅用于在localhost上进行测试。

Answer 1

如果使用PDO，则必须在DNS（数据源名称）上设置字符集：

$pdo = new PDO("mysql:host=$dbservername;dbname=$dbname;charset=utf8mb4", $dbusername, $dbpassword, $dboptions);
                                                        ^^^^^^^^^^^^^^^

删除行：

$dboptions = array('charset=utf8mb4');

PHP PDO搜索与变音符匹配不起作用

更新1

Update2

1 个答案: