Question

使用SQL server（2012）我有一个表 - TABLE_A列

(id, name, category, type, reference)

id - 是一个主键，由一个separte表（table_ID）控制，该表保存主要的下一个可用id。通常插入是从应用程序端（java）进行的，它在每次插入后负责将此id更新为下一个id。（通过EJB或手动等）然而，我想编写存储过程（从java应用程序调用）

- finds records in this table where (for example) reference = 'AAA' (passed as 
  parameter)
- Once multiple records found (all with same reference 'AAA', I want it to INSERT new 
  records with new ID's and reference = 'BBB', and other columns (name, category, type) 
  being same as in the found list.

我正在考虑类似于此

的查询

INSERT INTO table_A
       (ID
       ,NAME
       ,CATEGORY
       ,TYPE, 
       ,Reference)
 VALUES
       (
         **//current_nextID,**
         (select NAME
          from TABLE_A
          where REFENCE in (/*query returning value 'AAA' */),
          (select CATEGORY
          from TABLE_A
          where REFENCE in (/*query returning value 'AAA' */),
          (select TYPE
          from TABLE_A
          where REFENCE in (/*query returning value 'AAA' */),
          'BBB - NEW REFERENCE VALUE BE USED'
          )

因为，我不知道我将插入多少条记录，即条件查询的结果集中有多少项

 select /*field */
          from TABLE_A
          where REFENCE in (/*query returning value 'AAA' */),

我不知道如何在每张唱片上提出ID的价值。有人可以提出任何建议吗？

Answer 1

从你的问题不清楚如何处理排序，但你可以做这样的事情

CREATE PROCEDURE copybyref(@ref VARCHAR(32)) AS
BEGIN
--  BEGIN TRANSACTION
    INSERT INTO tablea (id, name, category, type, reference)
    SELECT value + rnum, name, category, type, 'BBB'
      FROM 
    (
      SELECT t.*, ROW_NUMBER() OVER (ORDER BY id) rnum
        FROM tablea t
       WHERE reference = 'AAA'
    ) a CROSS JOIN 
    (
      SELECT value 
        FROM sequence
       WHERE table_id = 'tablea'
    ) s
    UPDATE sequence
     SET value = value + @@ROWCOUNT + 1
     WHERE table_id = 'tablea'
--  COMMIT TRANSACTION
END

样本用法：

EXEC copybyref 'AAA';

这是 SQLFiddle 演示

从同一个表中将值插入表中

1 个答案: