在使用SQLLDR加载2个表时使用相同的Oracle序列

Question

我想使用SQLLDR加载以下2个表。这两个表的表结构如下：

CREATE TABLE Customer
(ID varchar2(50), --PK
org_cd  varchar2(50), --PK
NAME VARCHAR2 (255),
Address1 VARCHAR2(1000),
DOB TIMESTAMP(3),
cust_ref_col number  ---used for all the future references to this record since this is a number. This is unique key.
    );

CREATE TABLE Customer_contact
(ID varchar2(50), --PK
org_cd  varchar2(50), --PK 
Contact_id Number, --PK --Running serial # for a given Customer
contact_name varchar2(50),
cust_ref_col number  ---foreign key from Customer table 
);

这里是数据文件customer.dat（由于我要生成Oracle序列号（partnersequence），所以最后一列的值是虚拟的

PTNR_78814824,ACCT,Tom,123 Church Road, 12-dec-99,1,Ralph,1
PTNR_78814825,FIN,Tom,124 Main Road, 12-dec-99,2,Jody,1
PTNR_78814826,ENGG,Tom,125 Station Road, 12-dec-99,3,Mardy,1

我的控制文件看起来像这样

LOAD DATA
INFILE test.dat
INTO TABLE Customer
APPEND
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' TRAILING NULLCOLS
(ID   ,
 org_cd   ,
 name     ,
 Address1 ,
 DOB      ,
 cust_ref_col   "partnersequence.nextval"
 )

INTO TABLE Customer_contact
APPEND
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' TRAILING NULLCOLS
(ID   ,
 org_cd   ,
 Fill1 Filler,
 Fill2 Filler,
 Fill3 Filler,
 Fill4 Filler,
 cust_ref_col   "partnersequence.nextval"
)

这里的问题是，Customer_contact表中的cust_ref_col正在获取新序列＃。我想使用为生成的相同序列客户表。您能帮忙吗？

Answer 1

正如您已经发现的那样，在控制文件中调用sequence.nextval会使它在加载的每一行中递增。诀窍是调用一个在实例化后立即设置值的包，然后调用返回每个加载行的值的包函数。由于我已经为自己的负载进行了设置，因此我将与您分享我所做的解释。我们的加载将load_date和load_sequence_id添加到表中，因此您将在这些示例中看到这些内容。假设读者已经理解了软件包的结构，因为在这里不解释主要问题就太多了，无法解释。

您需要创建一个序列（已经创建）和一个包。该程序包包含2个变量来保存load_date和load_seq_id，2个“ getter”函数返回它们，并在实例化时进行设置。然后，您的控制文件将调用“ getter”函数以从包中返回load_date和load_seq_id，每行都将相同。

包装规格和主体：

CREATE OR REPLACE PACKAGE SCHEMA.LOAD_SEQ AS
  /******************************************************************************
     NAME:       LOAD_SEQ
     PURPOSE:    Sets unique load_date and Load_seq_id per session when
                 the package is instantiated.  Package functions are
                 intended to be called from control files so all rows in a
                 file load will have the same load_date and
                 load_seq_id.

                 When the functions are called, the package is instantiated and
                 the code at the bottom is run once for the session, setting the
                 load_date and load_seq_id.  The functions simply return the values
                 which will remain the same for that session.

    load_date   date "MM/DD/YYYY" "to_char(trunc(schema.load_seq.get_load_date), 'mm/dd/yyyy')",
    load_seq_id decimal external "schema.load_seq.get_load_seq_id"
                 (each row then has the same load_seq_id).

     REVISIONS:
     Ver        Date        Author           Description
     ---------  ----------  ---------------  ------------------------------------
     1.0        2/20/2017   Gary_W           1. Created this package.
  ******************************************************************************/
  NEXT_LOAD_SEQ_ID NUMBER;
  NEXT_LOAD_DATE   DATE;

  FUNCTION GET_LOAD_SEQ_ID
    RETURN NUMBER;

  FUNCTION GET_LOAD_DATE
    RETURN DATE;
END THC_LOAD_SEQ;
/

CREATE OR REPLACE PACKAGE BODY SCHEMA.LOAD_SEQ AS
  /******************************************************************************
     NAME:       GET_LOAD_SEQ_ID
     PURPOSE:    Return the package variable LOAD_SEQ.NEXT_LOAD_SEQ_ID
                 which is set when the package is instantiated.  It does not
                 change during the session.

     REVISIONS:
     Ver        Date        Author           Description
     ---------  ----------  ---------------  ------------------------------------
     1.0        2/20/2017   Gary_W           1. Created this package.
  ******************************************************************************/
  FUNCTION GET_LOAD_SEQ_ID
    RETURN NUMBER IS
  BEGIN
    RETURN LOAD_SEQ.NEXT_LOAD_SEQ_ID;
  END GET_LOAD_SEQ_ID;

  /******************************************************************************
     NAME:       GET_LOAD_DATE
     PURPOSE:    Return the package variable LOAD_SEQ.NEXT_LOAD_DATE
                 which is set when the package is instantiated.  It does not
                 change during the session.

     REVISIONS:
     Ver        Date        Author           Description
     ---------  ----------  ---------------  ------------------------------------
     1.0        2/20/2017    Gary_W          1. Created this package.
  ******************************************************************************/
  FUNCTION GET_LOAD_DATE
    RETURN DATE IS
  BEGIN
    RETURN LOAD_SEQ.NEXT_LOAD_DATE;
  END GET_LOAD_DATE;
BEGIN
    -- Code outside of the procedures/functions defined in the spec runs 
    -- once on instantiation of the package, when the package is first called by the session.
    -- It sets the package variables which then do not change during the life of the session.
    SELECT SYSDATE, partnersequence.NEXTVAL
    INTO   LOAD_SEQ.NEXT_LOAD_DATE, LOAD_SEQ.NEXT_LOAD_SEQ_ID
    FROM   DUAL;
END LOAD_SEQ;
/

在您的控制文件中：
LOAD_DATE      date "MM/DD/YYYY" "to_char(trunc(schema.load_seq.get_load_date), 'mm/dd/yyyy')"
cust_ref_col   "decimal external "schema.load_seq.get_load_seq_id""