快速的Java SQL问题

Question

我的代码：

String sql = "SELECT Publisher.Name, Book.Title, ShopOrder.OrderDate, SUM(OrderLine.Quantity) AS No_Books, " 
      + "SUM(OrderLine.UnitSellingPrice * Orderline.Quantity) AS Total_Price" 
      + "FROM Publisher, Book, OrderLine, ShopOrder" 
      + "WHERE OrderLine.BookID = Book.BookID AND ShopOrder.ShopOrderID = OrderLine.ShopOrderID AND Publisher.PublisherID = Book.PublisherID AND Publisher.PublisherID = " + id 
      + "GROUP BY book.title, publisher.name, ShopOrder.OrderDate" 
      + "ORDER BY ShopOrder.OrderDate, Book.Title"; 

产生的错误：

syntax error at or near "Publisher" at char position 166 (Just after the FROM clause)

Answer 1

即使世界空间丢失

你的字符串是 内容S Total_PriceFROM出版商，Book，OrderLine，ShopOrderWHERE O ...

你应该使用：

String sql = "SELECT Publisher.Name, Book.Title, ShopOrder.OrderDate, SUM(OrderLine.Quantity) AS No_Books, " 
     + " SUM(OrderLine.UnitSellingPrice * Orderline.Quantity) AS Total_Price" 
     + " FROM Publisher, Book, OrderLine, ShopOrder" 
     + " WHERE OrderLine.BookID = Book.BookID AND ShopOrder.ShopOrderID = OrderLine.ShopOrderID AND Publisher.PublisherID = Book.PublisherID AND Publisher.PublisherID = " + id 
     + " GROUP BY book.title, publisher.name, ShopOrder.OrderDate" 
      + " ORDER BY ShopOrder.OrderDate, Book.Title"; 

Answer 2

当您连接这些字符串有TOTAL_PRICE之间，从第一号的空间。 和其他行类似。我总是以一个空格结束并开始一个带引号的SQL片段。

Answer 3

您需要在行尾或开头处使用空格。由此产生的字符串将如下所示：...AS Total_PriceFROM Publisher...