FETCH 检索一行查询结果 CLOSE 关闭游标 PREPARE 为动态执行准备SQL 语句 EXECUTE 动态地执行SQL 语句 DESCRIBE 描述准备好的查询 -The FETCH- results of a query to retrieve line CLOSE, CLOSE the cursor PREPARE- for dynamic execution of SQL statements EXECUTE- dynamically executing SQL statements DESCRIBE- DESCRIBE prepared queries