我的任务是创建一个 SQL Server 2016 视图，该视图将显示我的开发环境中不符合以下三个命名约定中的任何一个的当前数据库名称。
我得到的三个有效的命名约定
- 'XXX_YYY_DEV'
- 'XXX_YYY_DEV-nnn.nnn.nnn'
- 'XXX_YYY_DEV-nnn.nnn.nnn.nnn'
其中XXX是一个至少有 1 个字母数字字符长的YYY可变长度字符串， 是另一个至少有 1 个字母数字字符长的可变长度字符串，并且每次出现nnn是一个可变长度数值（最小值='0'），可以与以下任何一个相同另一个nnn的。
例子：
数据库名称
- 'Dinky_cu5tomer_DEV'
- '5aussage_Orders_DEV-12.3.0'
- 'TText1_text2_DEV-999.57.1.57'
符合标准，因此将被排除在视图之外。
数据库名称
- '_cu5tomer_DV'
- '5aussage_Orders_Now_DEV-12.3.0'
- 'TText1_text2_DEV-999.99a.1.57'
不符合标准，因此将被包含在视图中。
我试过分离出组成部分，但数字部分真的难倒我。
据我所知，数字位已被注释掉。
CREATE View vw_NonStandardDatabaseNames
AS
SELECT DISTINCT
X.DBRealName AS 'Non-Standard Name',*
FROM
(SELECT
db.name AS [DBRealName],
-- Client
(CASE
WHEN PATINDEX ('%[_]%', db.name) > 1
THEN SUBSTRING(db.name,1,PATINDEX ('%[_]%', db.name)-1)
ELSE ''
END) AS [Client],
-- First Underscore
PATINDEX ('%[_]%', db.name) AS [Pos_1],
(CASE
WHEN PATINDEX ('%[_]%', db.name) > 0
THEN '_'
ELSE ''
END) AS [US_1],
(CASE
WHEN PATINDEX ('%[_]DEV%', db.name) > 0
THEN '_'
ELSE ''
END) AS [US_2],
-- Database Name
(CASE
WHEN PATINDEX ('%[_]%', db.name) <= 1
THEN '' -- No Underscore 1
WHEN PATINDEX ('%[_]DEV%', db.name) <= 3
THEN '' -- No Client
WHEN PATINDEX ('%[_]%', db.name) = PATINDEX ('%[_]DEV%', db.name)
THEN '' -- No first underscore only second one + System Name.
WHEN PATINDEX ('%[_]%', db.name)+1 = PATINDEX ('%[_]DEV%', db.name)
THEN '' -- First underscore but no DB Name then second underscore + System Name.
WHEN PATINDEX ('%[_]%', db.name) > 1
AND PATINDEX ('%[_]DEV%', db.name) > 3
THEN SUBSTRING(db.name, PATINDEX ('%[_]%', db.name)+1,(PATINDEX('%[_]DEV%', db.name)-(PATINDEX ('%[_]%', db.name)+1)))
ELSE ''
END) AS [DBName],
-- Second Underscore
PATINDEX ('%[_]DEV%', db.name) AS [Pos2],
-- System Name
(CASE
WHEN PATINDEX ('%[_]DEV%', db.name) > 0 THEN 'DEV'
ELSE ''
END) AS [System_Name],
-- System Name
(CASE
WHEN PATINDEX ('%[_]DEV-%', db.name) > 0 THEN PATINDEX ('%[_]DEV-%', db.name) + 4
ELSE 0
END) AS [POS_3]
---- Hyphen after 'DEV' System Name
-- (CASE
-- WHEN db.name LIKE '%[_]DEV-%' THEN '-'
-- ELSE ''
--END) AS [Hyphen]
---- Version Major
--'' AS [VersionMajor],
--'' AS [Dot1],
---- Version Minor
--'' AS [VersionMinor],
--'' AS [Dot2],
---- Revision
--'' AS [Revision],
--'' AS [Dot3],
---- Build
--'' AS [Build]
FROM sys.databases db
WHERE db.name NOT IN ('master','model','msdb','tempdb')
--UNION
--as above but with 3 digit Version
--UNION
--as above but with 4 digit version
) X
WHERE
X.DBRealName != Concat(X.Client, X.US_1, X.DBName, X.US_2, X.System_Name) --, X.Hyphen, X.VersionMajor, X.Dot1, X.VersionMinor, X.Dot2, X.Revision, X.Dot3, X.Build