Question

我有一个由程序代码填充的数据登台表。

TABLE BatchRecord{
    BatchRecordID NUMBER PRIMARY KEY,
    BatchID NUMBER, --Assigned by the procedural code
    RecordID NUMBER, --Relative to the batch
    FieldID NUMBER, --Assigned by the procedural code; FK to another table
    Value VARCHAR2(MAX)
    Instance NUMBER}

然后需要将每个BatchRecord转换为三个相关的表：Records，RecordFields，FieldValues。

TABLE Record{
    RecordID NUMBER PRIMARY KEY,
    BatchID NUMBER, --Same from BatchRecords}

TABLE RecordFields{
    RecordFieldID NUMBER PRIMARY KEY,
    RecordID NUMBER, --FK from Records
    FieldID NUNBER --Same from BatchRecords}

TABLE FieldValues{
    RecordFieldID NUMBER PRIMARY KEY,
    Instance NUMBER PRIMARY KEY, --Same from BatchRecords
    Value VARCHAR2(MAX) --Same from BatchRecords}

在SQL Server中，我可以使用MERGE语句并使用OUTPUT捕获新插入的键来完成此操作：

CREATE TABLE #InsertedRecords(RecordID INT, NewRecordID INT);

MERGE INTO Records USING (
    SELECT RecordID
    FROM BatchRecords
    WHERE BatchID = @BatchID
    GROUP BY RecordID) AS BR ON 1 = 0
WHEN NOT MATCHED THEN
    INSERT (BatchID)
    VALUES (@BatchID)
    OUTPUT BR.RecordID, INSERTED.RecordID INTO #InsertedRecords;

采用类似的方法插入RecordFields，并使用INSERT...SELECT语句插入FieldValues。

但是，在Oracle中，无法在RETURNING语句中使用OUTPUT（相当于MERGE），甚至不能在SELECT...INTO语句中使用。{ / p>

是否有可能在Oracle中完成相同任务，同时避免FORALL循环，因为BatchRecords的总数可能超过数百万？

Answer 1

您可以尝试使用oracle PIPELINE函数从BatchRecord中选择所有记录，然后将行管道输入到不同的表中。如果需要，我可以展示一个例子。

修改

create or replace package test_pkg AS TYPE REP_CURS IS REF CURSOR; TYPE output_REC IS RECORD( RecordID_ number, BatchID_ number); TYPE output_TAB IS TABLE OF output_REC; FUNCTION Get_Data RETURN output_TAB PIPELINED; END test_pkg; CREATE OR REPLACE PACKAGE BODY test_pkg IS FUNCTION Get_Data RETURN output_TAB PIPELINED IS output_REC_ output_REC; rep_lines_ REP_CURS; stmt_ VARCHAR2(5000); table_rec_ BatchRecord%ROWTYPE; begin stmt_ := ' (select BatchRecordID,BatchID ....Instance from BatchRecord) '; OPEN rep_lines_ FOR stmt_; LOOP FETCH rep_lines_ INTO table_rec_; EXIT WHEN rep_lines_%NOTFOUND; output_REC_.RecordID_ := <<whatever valu that you want>; output_REC_.BatchID_ := table_rec_.BatchID; PIPE ROW(output_REC_); END LOOP; CLOSE rep_lines_; RETURN; exception when others then DBMS_OUTPUT.put_line('Error:' || DBMS_UTILITY.FORMAT_ERROR_BACKTRACE || DBMS_UTILITY.FORMAT_ERROR_STACK || DBMS_UTILITY.FORMAT_CALL_STACK); END Get_Data; END test_pkg;

我已经展示了插入Record的示例。你必须对其他两个表做类似的事情。希望这会有所帮助!!

将数据插入相关Oracle表并维护标识值列表

1 个答案: