Question

我已经通过本网站上的一些链接创建了一个存储过程，如下所示：
How to insert Huge dummy data to Sql server
What is the most efficient way to generate 8 character random alphanumeric string in TSQL?

我的存储过程：

IF  EXISTS (SELECT 1 FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[DUMMY_INSERT]') AND type in (N'P', N'PC'))
BEGIN
    DROP PROCEDURE  DUMMY_INSERT
END
GO
CREATE PROCEDURE DUMMY_INSERT (
@noOfRecords INT
)
AS
BEGIN

DECLARE @r varchar(8)

SELECT @r = coalesce(@r, '') +CHAR(
CASE WHEN r between 0 and 9 THEN 48
WHEN r between 10 and 35 THEN 55
ELSE 61 END + r)
FROM
master..spt_values
CROSS JOIN
(SELECT CAST(RAND(ABS(CHECKSUM(NEWID()))) *61 as int) r) a
WHERE type = 'P' AND number < 8

DECLARE @count int
SET @count = 1;

WHILE (@count < @noOfRecords)
BEGIN
    INSERT INTO Tbl_Customer(name)
     VALUES(@r);

     SET @count = @count + 1;
END
END

执行时，它会插入@noOfRecords（由用户指定）记录，其中相同名称生成为@r。如何为每个生成的记录设置@r 不同的随机nvarchar。

Answer 1

尝试根据您的需要调整以下代码段：

IF OBJECT_ID(N'dbo.DUMMY_INSERT', N'P') IS NOT NULL DROP PROCEDURE dbo.DUMMY_INSERT;
GO
CREATE PROCEDURE dbo.DUMMY_INSERT(@noOfRecords INT, @chars INT = 8) AS
WITH
  cc AS(SELECT 1 c UNION ALL SELECT c + 1 FROM cc WHERE c < @chars),
  rr AS(SELECT 1 r UNION ALL SELECT r + 1 FROM rr WHERE r < @noOfRecords),
  rc AS(SELECT r, ABS(CHECKSUM(NEWID())) % 61 rnd FROM rr CROSS JOIN cc)
  SELECT
    (SELECT NCHAR(IIF(rnd < 10, 48, IIF(rnd < 36, 55, 61))) [text()]
     FROM rc WHERE rc.r = rr.r
     FOR XML PATH('')) rndrow
  FROM rr;
GO
IF OBJECT_ID(N'dbo.Tbl_Customer', N'U') IS NOT NULL DROP TABLE dbo.Tbl_Customer;
GO
CREATE TABLE dbo.Tbl_Customer(name NVARCHAR(30));
GO
INSERT dbo.Tbl_Customer(name) EXEC dbo.DUMMY_INSERT 20;
GO
SELECT name FROM dbo.Tbl_Customer;

如何在sql server中生成随机nvarchars

1 个答案: