为什么此查询在Sybase中不起作用？

Question

我曾经在SQL Server数据库上工作过.现在我必须处理Sybase数据库(使用Squirrel客户端).此查询无效:

DECLARE @tableName VARCHAR(500);
DECLARE my_cursor CURSOR FOR

SELECT name
FROM   sysobjects
WHERE  type = 'U';
OPEN my_cursor;
FETCH NEXT FROM my_cursor INTO @tableName;
WHILE @@FETCH_STATUS = 0
    BEGIN
        //Do something here
        FETCH NEXT FROM my_cursor;
    END
CLOSE my_cursor;
DEALLOCATE CURSOR my_cursor; 

它给出了一个错误 - Incorrect syntax near the keyword 'FROM'. SQLState: ZZZZZ ErrorCode: 156 Error occured in: FETCH NEXT FROM my_cursor INTO @table_Name现在这在SQL Server数据库中工作正常(在我将最后一行更改为之后DEALLOCATE my_cursor.有人可以告诉我哪里出错了吗？

Answer 1

正如Mitch所指出的,fetch语法是:

fetch cursor_name [into fetch_target_list]

您还需要在单独的批处理中声明游标,这意味着您必须在declare语句之后放置一个"GO".然后,您将发现您的变量超出范围,因此您需要将其移动到"GO"之后.

您还需要检查@@ sqlstatus以查看fetch的成功程度,而不是@@ FETCH_STATUS,我认为它只是MSSQL.

DECLARE my_cursor CURSOR FOR
  SELECT name
  FROM   sysobjects
  WHERE  type = 'U'
go

DECLARE @tableName VARCHAR(500)
set nocount on
OPEN my_cursor
FETCH my_cursor INTO @tableName

WHILE @@sqlstatus = 0
  BEGIN
      --Do something here

      FETCH my_cursor INTO @tableName
      print @tablename
  END

CLOSE my_cursor
DEALLOCATE CURSOR my_cursor

并且Sybase ASE中的行末尾不需要分号.