如何从sql中删除行

Question

需要从sql表中删除行。表有3列：id，符号和份额

foreach ($rows as $row) 
{ 
    if($row["Symbol"] === $_POST["symbol"]) 
    { 
    // I tried these combinations, but none of them works: 
    // $sql = ("DELETE FROM stocks WHERE id = ? $_SESSION[id]");   
    // $sql = ("DELETE row FROM stocks WHERE id = $_SESSION[id]"); 
    // $sql = ("DELETE * FROM stocks WHERE id = $_SESSION[id]"); 
    // $sql = ("DELETE id, Symbol, Shares FROM stocks WHERE id = $_SESSION[id]"); 
     // DELETE FROM stocks WHERE id = $_SESSION["id"]; 
    } 
} 

程序进入if语句。我检查了。所以条件满足，但不执行DELETE。

Answer 1

这句法应该在任何数据库工作：

DELETE FROM stocks WHERE id = XXX 

我不知道什么是? $_SESSION[id]应该做的。尽量不?：

DELETE FROM stocks WHERE id = $_SESSION[id] 

这就是说，你应该参数的查询，而不是将参数传递到查询字符串。