如何在 SQL 服务器中动态命名游标

Question

谁能告诉我如何在 SQL 服务器中动态声明游标名称（固定名称 + 唯一名称）？

这是为了防止错误

02-25-2018 10:12:01 ERROR (AdHocReportserviceImpl.java:882) : org.springframework.jdbc.UncategorizedSQLException: CallableStatementCallback; uncategorized SQLException for SQL [{call usp_AdHocReport(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)}];
SQL state [34000]; error code [16916]; [FMWGEN][SQLServer JDBC Driver][SQLServer]A cursor with the name 'FetchRegion' does not exist.; nested exception is java.sql.SQLException: [FMWGEN][SQLServer JDBC Driver][SQLServer]A cursor with the name 'FetchRegion' does not exist

从多线程 java 应用程序访问它时。我试过在 CURSOR 声明后添加 LOCAL 但它不起作用。

DECLARE FetchRegion CURSOR READ_ONLY FOR
    SELECT ......

OPEN FetchRegion 

FETCH NEXT FROM FetchRegion INTO @RGN

WHILE @@ROWCOUNT <> 0
BEGIN
    .....
    FETCH NEXT FROM FetchRegion INTO @RGN
END 

CLOSE FetchRegion
DEALLOCATE FetchRegion

Answer 1

您需要在动态 sql 语句中运行它。作为起点，您可以检查这个问题：Using a cursor with dynamic SQL in a stored procedure

Answer 2

您可以使用此示例，我使用系统 table 获取前 10 行，但您可以创建自己的游标。

声明@cursor_name 为 NVARCHAR(100)

SET @cursor_name = 'sampleCursor' 
                   + Replace(Cast(Newid() AS VARCHAR(36)), '-', '') 

DECLARE @cursor_sql AS NVARCHAR(max) 

SET @cursor_sql = N'   DECLARE @name nvarchar(10)  DECLARE ' + @cursor_name + N' CURSOR FOR   select top 10 name from sys.all_columns OPEN ' + @cursor_name 
                  + N' FETCH NEXT FROM ' + @cursor_name 
                  + N' INTO @name WHILE @@FETCH_STATUS <> -1 BEGIN print @name FETCH NEXT FROM  ' + @cursor_name + N' INTO @name end CLOSE  ' 
                  + @cursor_name + N' DEALLOCATE  ' + @cursor_name 

PRINT @cursor_sql 

EXECUTE Sp_executesql 
  @cursor_sql

为游标名称添加一个 guid，以保证始终不同。

然后根据该名称创建并执行查询。

希望对您有所帮助！

如何在 SQL 服务器中动态命名游标

How to name a cursor dynamically in SQL Server

sql-server

cursor