插入n行存儲過程

Question

嘗試根據傳遞的參數插入多行。

試過了，只重復了一次：

ALTER PROCEDURE [dbo].[ActivateCertificates]

    @Count              int,
    @CertificateNumber  int,
    @Buyer              VarChar(50)


AS
Declare @x int
Declare @InitialCharacter   Char(1)
SET @InitialCharacter='C'
Declare @Last3      Char(3)
SET @Last3='867'

    while @x <= @Count 
begin
    /* CREATE THE CERTIFICATE NUMBER */
    set @CertificateNumber = @CertificateNumber +1
    /* insert into certificates  cert number and who sold to. */
    INSERT into Certificates (CertificateNumber,Buyer) 
    VALUES (@InitialCharacter + ltrim(rtrim(cast(@CertificateNumber as char))) + @Last3, @Buyer) 
end 
set @x =@x + 1


GO

Answer 1

您的變量在BEGIN/END塊外遞增。 我也建議您首先將變量設置為0，以避免在該內存位置存儲任何潛在的垃圾數據。

Answer 2

為了使用基於集合的查詢而不是循環來實現您的目標（ 順便說一句，StackOverflow上有很多這樣的例子 ），您必須擁有一個理貨（數字）表或使用子查詢或遞歸CTE快速創建它。

CREATE TABLE tally (id INT NOT NULL PRIMARY KEY);

將其填充到100000（ Celko樣式 ）

INSERT INTO tally (id) 
SELECT a.N + b.N * 10 + c.N * 100 + d.N * 1000 + e.N * 10000 + 1 as N
  FROM (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) a
      , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) b
      , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) c
      , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) d
      , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) e
ORDER BY N;

現在，您的存儲過程可以歸結為一條語句

CREATE PROCEDURE ActivateCertificates
  @Count              INT,
  @CertificateNumber  INT,
  @Buyer              VARCHAR(50)
AS
INSERT INTO Certificates (CertificateNumber, Buyer) 
SELECT 'C' + CAST(q.number + t.id AS VARCHAR(12)) + '867', q.buyer 
  FROM
( 
  SELECT @CertificateNumber number, @Buyer buyer
) q, tally t
WHERE t.id <= @Count;

這是SQLFiddle演示

現在，如果您生成的證書數量相對較少 （<32768），則可以使用遞歸CTE來構建數字序列（並且不需要持久的理貨表）

CREATE PROCEDURE ActivateCertificates
  @Count              INT,
  @CertificateNumber  INT,
  @Buyer              VARCHAR(50)
AS
WITH tally AS (
  SELECT 1 id
  UNION ALL
  SELECT id + 1 FROM tally WHERE id < @Count
)
INSERT INTO Certificates (CertificateNumber, Buyer) 
SELECT 'C' + CAST(q.number + t.id AS VARCHAR(12)) + '867', q.buyer 
  FROM
( 
  SELECT @CertificateNumber number, @Buyer buyer
) q, tally t OPTION (MAXRECURSION 32767);

這是這種情況的SQLFiddle演示