Question

我尝试运行SQL查询并收到错误：

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'logs.user_ID' in 'on clause'

查询是这样的：

SELECT 
logs.*, users.first_Name, users.last_Name, users.middle_Name 
FROM logs 
LEFT JOIN users ON (logs.user_ID = users.ID) 
WHERE logs.record_Type = 'issues' AND logs.record_ID = 33

当我在服务器上手动运行查询时，它返回正确的结果，但在PHP代码中没有快乐。

当我删除＆＃34; WHERE＆＃34;它在PHP中运行得很好。此时我怀疑是MySQL语法问题，但我无法弄明白。

查询生成代码：

public static function prepareQuery()   {

if(self::$distinct) {
    $query = array("SELECT DISTINCT");
} else {
    $query = array("SELECT");
}


if (count(self::$_fields) == 0) {
    $query[] = "*";
} else {
    $query[] = implode(", ", self::$_fields);
}

if (!empty(self::$_table)) {
    $query[] = "FROM " . self::$_table;
}

if (!empty(self::$_join)) {
    foreach (self::$_join as $aJoin) {
        list($table, $field, $expression, $value) = $aJoin;
        $sJoin = "LEFT JOIN " . $table . " ON (" . $field . " " . $expression . " " . $value . ")";
        $aJoins[] = $sJoin;
    }
    $query[] = implode(" \n", $aJoins);
}

if (!is_null(self::$_expression)) {
    $query[] = "WHERE " . self::$_expression;
}

self::$_query = implode(" \n", $query);
self::reset();
}

我在这称呼该方法：

public static function get($recordType = "all", $recordID = "0", $userID = "0") {
Select::setTable("logs");

$aFields = array("logs.*", "users.first_Name", "users.last_Name", "users.middle_Name");
Select::addField($aFields);

if ($recordType != "all") {
    Select::customExpression("logs.record_Type = '$recordType' AND logs.record_ID = $recordID");
} else {
    if ($userID != "0") {
        Select::customExpression("logs.user_ID = $userID");
    }
}

Select::join("users", "logs.user_ID", "=", "users.ID");

Select::prepareQuery();

Str::print_var(Select::$_query);

Select::execute();

$oResult = Select::$result;
return $oResult->fetchAll(PDO::FETCH_CLASS, "Log");
}

Answer 1

这在技术上不是一个答案，但我解决了这个问题。生成的SQL是：

SELECT 
logs.*, users.first_Name, users.last_Name, users.middle_Name 
FROM logs 
LEFT JOIN users ON logs.user_ID = users.ID 
WHERE logs.record_Type = 'issues' AND logs.record_ID = 33

我更改了“on”子句从“logs.user_ID”删除表引用，它工作得很好。当我在服务器上运行这个SQL时，它突出显示了单词LOGs，所以我怀疑LOGS是一些特殊的关键字。虽然问题已经解决，但是这个错误的原因对我来说仍然是个谜，所以我很感激有关这个问题的任何意见。

＆＃34; SQLSTATE [42S22]：未找到列：1054未知列＆＃39; logs.user_ID＆＃39;在＆＃39; on条款＆＃39;＆＃34; - 使用LEFT JOIN时

1 个答案: