php – 为什么这个sql无法正常工作？

我有一个问题

public static function TestQuery(

 $start=0,
 $limit=0){


 $sql = "
SELECT     count(*) AS total
FROM    db.table1
JOIN    db.table2
 ON     table1.fieldID = {$fieldID}

AND    table2.assigned = 'N'";



  $qry = new sqlQuery;
  $qry->query($sql);
  if($row = $qry->fetchRow()){
   $total = intval($row->total);
  }

 return $total;

} 

哪个工作正常但是当我添加下面的限制时,它不起作用并给我错误

public static function TestQuery(

 $start=0,
 $limit=0){


 $sql = "
SELECT     count(*) AS total
FROM    db.table1
JOIN    db.table2
 ON     table1.fieldID = {$fieldID}

AND    table2.assigned = 'N'";

//this fails   
if($recordlimit > 0) $sql .= "LIMIT {$startRecord}, {$recordLimit} ";  
//  
  $qry = new sqlQuery;
  $qry->query($sql);
  if($row = $qry->fetchRow()){
   $total = intval($row->total);
  }

 return $total;

} 

任何帮助将不胜感激

解决方法:

在LIMIT前面放一个空格：

" LIMIT {$startRecord}, {$recordLimit} "

没有空间你的sql会导致语法错误.

编辑：这是答案不正确！在LIMIT之前没有空格的MysqL不会出错(但是早期版本的PHPmyadmin会错误地解析这样的sql).