CLOSE 语句 [ESQL] [SP]

此语句用于关闭游标。

语法

CLOSE cursor-name

cursor-name : identifier | hostvar

注释

此语句关闭指定的游标。

权限

游标在此前必须已打开。

副作用

无。

另请参见

标准和兼容性

SQL/2003 核心特性。

示例

以下示例关闭嵌入式 SQL 中的游标。

EXEC SQL CLOSE employee_cursor;
EXEC SQL CLOSE :cursor_var;

以下过程使用游标。

CREATE PROCEDURE TopCustomer (OUT TopCompany CHAR(35), OUT TopValue INT)
BEGIN
   DECLARE err_notfound EXCEPTION
      FOR SQLSTATE '02000';
   DECLARE curThisCust CURSOR FOR
   SELECT CompanyName, CAST(    sum(SalesOrderItems.Quantity *
   Products.UnitPrice) AS INTEGER) VALUE
   FROM Customers
   LEFT OUTER JOIN SalesOrders
   LEFT OUTER JOIN SalesOrderItems
   LEFT OUTER JOIN Products
   GROUP BY CompanyName; 
DECLARE ThisValue INT;
   DECLARE ThisCompany CHAR(35);
   SET TopValue = 0;
   OPEN curThisCust;
   CustomerLoop:
   LOOP
      FETCH NEXT curThisCust
      INTO ThisCompany, ThisValue;
         IF SQLSTATE = err_notfound THEN
            LEAVE CustomerLoop;
         END IF;
         IF ThisValue > TopValue THEN
            SET TopValue = ThisValue;
            SET TopCompany = ThisCompany;
         END IF;
      END LOOP CustomerLoop;
   CLOSE curThisCust;
END