SQL Server获取下一个编码字符实现继续重构与增强

 1 IF OBJECT_ID(N‘dbo.ufn_GetCharTable‘, ‘TF‘) IS NOT NULL
 2 BEGIN
 3     DROP FUNCTION dbo.ufn_GetCharTable;
 4 END
 5 GO
 6  
 7 --==================================
 8 -- 功能: 获取字符映射表表值函数
 9 -- 说明: 编码字符只包含0-9和A-Z这两类字符
10 --       将以上字符映射到对应十进制数值。
11 -- 作者: XXX
12 -- 创建: yyyy-MM-dd
13 -- 修改: yyyy-MM-dd XXX 修改内容描述
14 -- 调用: SELECT CodeChar, CodeValue FROM dbo.ufn_GetCharTable();
15 --==================================
16 CREATE FUNCTION dbo.ufn_GetCharTable
17 (
18 ) RETURNS @tblChar TABLE (
19     [Char] CHAR(1) NOT NULL,
20     Value TINYINT NOT NULL
21 )
22     --$Encode$--
23 AS
24 BEGIN
25     DECLARE
26         @intStartIndexID AS TINYINT,
27         @intEndIndexID AS TINYINT;
28  
29     SELECT
30         @intStartIndexID = 0,
31         @intEndIndexID = 0;
32  
33     -- 初始化0-9数字字符
34     SELECT
35         @intStartIndexID = ASCII(‘0‘),
36         @intEndIndexID = ASCII(‘9‘);
37     WHILE @intStartIndexID <= @intEndIndexID
38     BEGIN
39         INSERT INTO @tblChar ([Char], Value)
40         VALUES (CHAR(@intStartIndexID), 0);
41  
42         SET @intStartIndexID = @intStartIndexID + 1;         
43     END
44  
45     -- 初始化A-Z字母字符
46     SELECT
47         @intStartIndexID = ASCII(‘A‘),
48         @intEndIndexID = ASCII(‘Z‘);
49     WHILE @intStartIndexID <= @intEndIndexID
50     BEGIN
51         INSERT INTO @tblChar ([Char], Value)
52         VALUES (CHAR(@intStartIndexID), 0);
53  
54         SET @intStartIndexID = @intStartIndexID + 1;         
55     END
56  
57     -- 修改每个字符对应的10进制整数值
58     ;WITH tCodeData AS (
59         SELECT [Char], ROW_NUMBER() OVER (ORDER BY [Char] ASC) AS RowNum
60         FROM @tblChar
61     )
62  
63     UPDATE T2
64     SET T2.Value = T.RowNum - 1
65     FROM tCodeData AS T
66         INNER JOIN @tblChar AS T2
67             ON T.[Char] = T2.[Char];
68  
69     RETURN;
70 END
71 GO
72  

 1 IF OBJECT_ID(N‘dbo.ufn_GetCodeCharsValue‘, ‘FN‘) IS NOT NULL
 2 BEGIN
 3     DROP FUNCTION dbo.ufn_GetCodeCharsValue;
 4 END
 5 GO
 6  
 7 --==================================
 8 -- 功能: 获取编码字符串对应的10进制整数数值
 9 -- 说明: 具体实现阐述
10 -- 作者: XXX
11 -- 创建: yyyy-MM-dd
12 -- 修改: yyyy-MM-dd XXX 修改内容描述
13 -- 调用: SELECT dbo.ufn_GetCodeIntegerValue(‘A0000‘)
14 --==================================
15 CREATE FUNCTION dbo.ufn_GetCodeCharsValue
16 (
17     @chvCodeChars VARCHAR(8)            -- 编码字符串
18  
19 ) RETURNS INT
20     --$Encode$--
21 AS
22 BEGIN
23     SET @chvCodeChars = ISNULL(@chvCodeChars, ‘‘);    
24     SET @chvCodeChars = UPPER(@chvCodeChars);
25  
26     DECLARE @intCodeCharsValue AS BIGINT;
27     SET @intCodeCharsValue = 0;
28  
29     DECLARE @tintLength AS TINYINT;
30     SET @tintLength = LEN(@chvCodeChars);
31  
32     IF @tintLength = 0
33     BEGIN
34         RETURN @intCodeCharsValue;
35     END
36  
37     DECLARE @tblChar TABLE(
38         [Char] CHAR(1) NOT NULL,
39         Value TINYINT NOT NULL
40     );
41  
42     INSERT INTO  @tblChar ([Char], Value)
43     SELECT [Char], Value
44     FROM dbo.ufn_GetCharTable();
45  
46     -- 编码字符串的首字母必须是A-Z字母字符的逻辑检查
47     IF NOT EXISTS (SELECT 1 FROM @tblChar WHERE [Char] = SUBSTRING(@chvCodeChars, 1, 1) AND Value >= 10)
48     BEGIN
49         RETURN @intCodeCharsValue;
50     END
51  
52     WHILE @tintLength >= 1
53     BEGIN    
54         SELECT @intCodeCharsValue = @intCodeCharsValue + CAST(Value * POWER(10, @tintLength - 1) AS BIGINT)
55         FROM @tblChar
56         WHERE [Char] = SUBSTRING(@chvCodeChars, 1, 1);
57  
58         SET @chvCodeChars = STUFF(@chvCodeChars, 1, 1, ‘‘);
59  
60         SET @tintLength = @tintLength - 1;        
61     END
62  
63     RETURN @intCodeCharsValue;
64 END
65 GO