Question

如何防止此错误

＆＃34; OLE DB提供程序＆＃34; MSDASQL＆＃34;用于链接服务器返回的消息＆＃34; [Teradata] [ODBC Teradata驱动程序] [Teradata数据库]对象＆＃39; teradataDB.tablename＆＃39;不存在。＆＃34;

我使用openquery来检查teradata表是否存在，如果存在，则删除表并从select中重新创建表。我使用openquery将teradata表中的数据插入到sql server表中。但是，当我运行存储过程时，它会给我上面的错误，因为它执行插入并首先在最后两行选择。如何修改它以先运行第一个块然后再运行最后两行？

DECLARE @strSql NVARCHAR(MAX) = ''
DECLARE @TableName NVARCHAR(50)
DECLARE @linkedServer NVARCHAR(50)
DECLARE @TabExists BIT

DECLARE TableCursor CURSOR LOCAL FOR
SELECT TABLENAME FROM #TableList

OPEN TableCursor
FETCH NEXT FROM TableCursor INTO @TableName

WHILE @@FETCH_STATUS = 0 
BEGIN
SET @strSql='Select count(1) as TabExists FROM DBC.TABLES WHERE  TABLEKIND=''T'' AND DATABASENAME=''teradataDB'' AND TABLENAME=''' +@TableName+ ''''
SET @strSql = N'select @TabExists=TabExists from OPENQUERY('+@linkedServer+', ''' + REPLACE(@strSql, '''', '''''') + ''')'
EXEC sp_executesql @strSql, N'@TabExists BIT OUT', @TabExists OUT;


FETCH NEXT FROM TableCursor INTO @TableName  

IF (@TableName ='tablename')
BEGIN
    IF (@TableName ='tablename') AND (@TabExists = 1)
    BEGIN
        EXEC sp_executesql
        N'
        EXEC (
            ''DROP TABLE teradataDB.tablename'') AT [linkedserver];'
    END

    EXEC sp_executesql
    N'
    EXEC (
        ''CREATE TABLE AS SELECT (
                      ~~~~
                    ) 
        '' ) AT [linkedserver];'


END

END
CLOSE TableCursor
DEALLOCATE TableCursor

INSERT INTO sqlServerDB.tablename
SELECT * FROM OPENQUERY (linkedserver, 'SELECT columns FROM teradataDB.tablename')

Answer 1

您可以使用以下代码代替CURSOR以上的代码。

IF (EXISTS (SELECT * 
                 FROM INFORMATION_SCHEMA.TABLES 
                 WHERE TABLE_SCHEMA = 'TheSchema' 
                 AND  TABLE_NAME = 'TheTable'))
BEGIN
    DROP TABLE teradataDB.tablename
END

现在您不需要创建表的结构，并触发以下查询。

INSERT INTO sqlServerDB.tablename
SELECT * FROM OPENQUERY (linkedserver, 'SELECT columns FROM teradataDB.tablename')

Sql server如何避免在存储过程中首先运行外部块

1 个答案: