我需要将数据从MS SQL（AWS EC2）表复制到Oracle（AWS RDS）实例。在几次失败的方法之后，我决定在SQL中创建一个链接服务器到Ora数据库并在触发事件上插入新数据。到目前为止，非常好。
现在我试图从[相同] SQL表中将数据插入到单个Oracle表中，但是收到以下错误
“用于链接服务器的”OLE DB提供程序“OraOLEDB.Oracle”“desora12”为“CREATE_DATE”列提供了无效的元数据。不支持数据类型。“
我已尝试从插入语句中取出CREATE_DATE，但收到相同的错误。我还尝试在select语句中转换和转换CreateDate。同样的错误。
Oracle中的CREATE_DATE列类型是TIMESTAMP（6）。 SQL中相应的CreateDate列类型是可为空的DateTime
表格中有31列，这里是插入的删节版本。
INSERT INTO [desora12]..[DATAENTRY].[TBL_API_ITEM_TYPEID1_LBL_TEST]
([SITE_ID]
,[USER_ID]
,[CREATE_DATE]
,[TRANSFER_DATE]
,[TRANSFER_STATUS])
SELECT TOP 1 SiteID,
UserID,
CreateDate,
TransferDate,
TransferStatus
FROM API.ItemDataTypeID1Label
WHERE TransferDate is null
AND TransferStatus is null
AND ReturnStatus=200
任何帮助？
答案 0 :(得分：1)
我总是“拉”来传输数据，而不是像你正在做的那样“推”。 Pulls确保您在刷新开发或测试数据库时不会损害生产数据库。就日期而言，我在Oracle和SQL Server之间的日期类型上苦苦挣扎。我最终将我的Oracle日期转换为文本（请记住我正在拉动）并允许SQL Server自动将文本转换为日期。您可以在我对下面的bindvar的调用中看到这一点，我将Oracle日期转换为字符串。
如果您要从Oracle中学习，请查看DBMS_HS_PASSTHROUGH。它比通过数据库链接选择快许多倍。我一次获取200万条记录，我的运行时间从4个半小时到5分钟不等。
PROCEDURE bindvar (
p_cursor IN INTEGER
, p_pos IN INTEGER
, p_value IN VARCHAR2
)
AS
l_routine CONSTANT oracleobj_t := 'bindvar';
BEGIN
DBMS_HS_PASSTHROUGH.bind_variable@intervaldata.world (p_cursor, p_pos, p_value);
EXCEPTION
WHEN OTHERS
THEN
make_log_error_entry (
p_routine => l_routine
, p_message => cealogging.activity_log_maintenance_pkg.labels (
'p_cursor'
, p_cursor
, 'p_pos'
, p_pos
, 'p_value'
, p_value
)
);
RAISE;
END;
-- ***********************************************************************
-- Fetch Interval Data
-- Purpose:
-- Retrieve interval data from SQL*Server
-- Arguments:
-- p_earliestintervaldate - earliest interval date from which data will be fetched
-- p_latestintervaldate - latest interval date from which data will be fetched
-- p_earliestlogtime - earliest log date for which data will be fetched
-- p_latestlogtime - latest log date for which data will be fetched
-- p_maxrecords - maximum records to fetch from SQL Server
-- ***********************************************************************
FUNCTION fetch_intervaldata (
p_earliestintervaldate IN DATE
, p_latestintervaldate IN DATE
, p_earliestlogdate IN DATE
, p_latestlogdate IN DATE
, p_meterno IN VARCHAR2 DEFAULT NULL
, p_maxrecords IN INTEGER DEFAULT NULL
)
RETURN PLS_INTEGER
AS
l_routine CONSTANT oracleobj_t := 'fetch_intervaldata';
l_format CONSTANT oracleobj_t := 'YYYYMMDD HH24:MI:SS';
l_cnt PLS_INTEGER;
l_cursor INTEGER;
l_earliestlogdate DATE := p_earliestlogdate;
l_numrows INTEGER;
l_row intervaldata_load%ROWTYPE;
l_ret PLS_INTEGER := 0;
l_sql VARCHAR2 (200)
:= ';select * from cea.fetchCisIntervalData( ?, ?, ?, ?, ?) where interval_read is not null';
l_latestlogtimearg DATE;
BEGIN
close_databaselink (p_link => 'INTERVALDATA.WORLD');
EXECUTE IMMEDIATE 'truncate table intervaldata_load';
-- set l_cnt = 1 to allow the first pass to run
-- thereafter it is the number or records returned by the pass that will
-- be tested for continuation
l_cnt := 1;
WHILE l_earliestlogdate <= p_latestlogdate
AND l_cnt > 0
AND (p_maxrecords IS NULL
OR l_ret < p_maxrecords)
LOOP
make_log_entry (
p_routine => l_routine
, p_message => 'processing starting for ' || TO_CHAR (l_earliestlogdate, c_intervaldateformat)
);
l_cursor := DBMS_HS_PASSTHROUGH.open_cursor@intervaldata.world;
DBMS_HS_PASSTHROUGH.parse@intervaldata.world (l_cursor, l_sql);
bindvar (p_cursor => l_cursor, p_pos => 1, p_value => TO_CHAR (l_earliestlogdate, l_format));
bindvar (
p_cursor => l_cursor
, p_pos => 2
, p_value => TO_CHAR (l_earliestlogdate + INTERVAL '6' HOUR - INTERVAL '1' SECOND, l_format)
);
bindvar (p_cursor => l_cursor, p_pos => 3, p_value => TO_CHAR (p_earliestintervaldate, l_format));
bindvar (p_cursor => l_cursor, p_pos => 4, p_value => TO_CHAR (p_latestintervaldate, l_format));
bindvar (p_cursor => l_cursor, p_pos => 5, p_value => p_meterno);
l_cnt := 0;
LOOP
l_numrows := DBMS_HS_PASSTHROUGH.fetch_row@intervaldata.world (l_cursor);
EXIT WHEN l_numrows = 0
OR (p_maxrecords IS NOT NULL
AND l_ret >= p_maxrecords);
DBMS_HS_PASSTHROUGH.get_value@intervaldata (l_cursor, 1, l_row.meterno);
DBMS_HS_PASSTHROUGH.get_value@intervaldata (l_cursor, 2, l_row.interval_start);
DBMS_HS_PASSTHROUGH.get_value@intervaldata (l_cursor, 3, l_row.endpointid);
DBMS_HS_PASSTHROUGH.get_value@intervaldata (l_cursor, 4, l_row.logtime);
DBMS_HS_PASSTHROUGH.get_value@intervaldata (l_cursor, 5, l_row.interval_read);
DBMS_HS_PASSTHROUGH.get_value@intervaldata (l_cursor, 6, l_row.buy_back);
DBMS_HS_PASSTHROUGH.get_value@intervaldata (l_cursor, 7, l_row.phase_a);
DBMS_HS_PASSTHROUGH.get_value@intervaldata (l_cursor, 8, l_row.phase_b);
DBMS_HS_PASSTHROUGH.get_value@intervaldata (l_cursor, 9, l_row.phase_b);
EXIT WHEN l_row.logtime > p_latestlogdate;
INSERT INTO intervaldata_load
VALUES l_row;
l_cnt := l_cnt + 1;
l_ret := l_ret + 1;
END LOOP;
DBMS_HS_PASSTHROUGH.close_cursor@intervaldata.world (l_cursor);
make_log_entry (
p_routine => l_routine
, p_message => LPAD (l_cnt, 10)
|| ' records retrieved for '
|| TO_CHAR (l_earliestlogdate, c_intervaldateformat)
|| ' to '
|| TO_CHAR (l_earliestlogdate + INTERVAL '6' HOUR, c_intervaldateformat)
);
l_earliestlogdate := l_earliestlogdate + INTERVAL '6' HOUR;
END LOOP;
RETURN l_ret;
EXCEPTION
WHEN OTHERS
THEN
make_log_error_entry (
p_routine => l_routine
, p_message => 'processing ' || TO_CHAR (l_earliestlogdate, l_format)
);
DBMS_HS_PASSTHROUGH.close_cursor@intervaldata.world (l_cursor);
RAISE;
END fetch_intervaldata;