SQL 汉字转为首字母大写字母，c#通过汉字获取其首字母大写

功能：根据返回所有汉字的首字母----

存储过程中：
调用：select [dbo].[fun_getPY](字段名) as zm from 表名
*/
Create  function fun_getPY 
 ( 
    @str nvarchar(4000) 
 ) 
returns nvarchar(4000) 
AS
BEGIN
    DECLARE @word NCHAR(1),@PY NVARCHAR(4000)
    SET   @PY=''
    WHILE len(@str)>0
    BEGIN
        SET @word=left(@str,1)
--如果非汉字字符，返回原字符
        SET @PY=@PY+(CASE WHEN UNICODE(@word)BETWEEN 19968 AND 19968+20901
        THEN  (SELECT TOP 1 PY FROM(
        SELECT 'A'as PY,N'驁'as word
        UNION ALL SELECT 'B',N'簿'
        UNION ALL SELECT 'C',N'錯'
        UNION ALL SELECT 'D',N'鵽'
        UNION ALL SELECT 'E',N'樲'
        UNION ALL SELECT 'F',N'鰒'
        UNION ALL SELECT 'G',N'腂'
        UNION ALL SELECT 'H',N'夻'
        UNION ALL SELECT 'J',N'攈'
        UNION ALL SELECT 'K',N'穒'
        UNION ALL SELECT 'L',N'鱳'
        UNION ALL SELECT 'M',N'旀'
        UNION ALL SELECT 'N',N'桛'
        UNION ALL SELECT 'O',N'漚'
        UNION ALL SELECT 'P',N'曝'
        UNION ALL SELECT 'Q',N'囕'
        UNION ALL SELECT 'R',N'鶸'
        UNION ALL SELECT 'S',N'蜶'
        UNION ALL SELECT 'T',N'籜'
        UNION ALL SELECT 'W',N'鶩'
        UNION ALL SELECT 'X',N'鑂'
        UNION ALL SELECT 'Y',N'韻'
        UNION ALL SELECT 'Z',N'咗'
        )T
        WHERE word>=@word COLLATE Chinese_PRC_CS_AS_KS_WS
        ORDER BY PY ASC)ELSE  @word END)
        SET @str=RIGHT(@str,LEN(@str)-1)
    END
    RETURN UPPER(@PY)
END
GO 

 




程序中：

#region 汉字获得其大写首字母方法。
///<summary>  
///   判断是否为汉字  
///</summary>  
///<param   name="chrStr">待检测字符串</param>  
///<returns>是汉字返回true</returns>
publicbool IsChineseCharacters(string chrStr)
        {
            Regex CheckStr =new Regex("[/u4e00-/u9fa5]");
return CheckStr.IsMatch(chrStr);
        }

///<summary>
/// 得到每个汉字的字首拼音码字母(大写)
///</summary>
///<param name="chrStr">输入字符串</param>
///<returns>返回结果</returns>
publicstring GetHeadCharacter(string chrStr)
        {
string strHeadString =string.Empty;

            System.Text.Encoding gb = System.Text.Encoding.GetEncoding("gb2312");
for (int i =0; i < chrStr.Length; i++)
            {
//检测该字符是否为汉字
//if (!IsChineseCharacters(chrStr.Substring(i, 1)))
//{
//    strHeadString += chrStr.Substring(i, 1);
//    continue;
//}

byte[] bytes = gb.GetBytes(chrStr.Substring(i, 1));
string lowCode = System.Convert.ToString(bytes[0] -0xA0, 16);
string hightCode = System.Convert.ToString(bytes[1] -0xA0, 16);
int nCode = Convert.ToUInt16(lowCode, 16) *100+ Convert.ToUInt16(hightCode, 16);      //得到区位码
                strHeadString += FirstLetter(nCode);
            }
return strHeadString;
        }

///<summary>
/// 通过汉字区位码得到其首字母(大写)
///</summary>
///<param name="nCode">汉字编码</param>
///<returns></returns>
publicstring FirstLetter(int nCode)
        {
if (nCode >=1601&& nCode <1637) return"A";
if (nCode >=1637&& nCode <1833) return"B";
if (nCode >=1833&& nCode <2078) return"C";
if (nCode >=2078&& nCode <2274) return"D";
if (nCode >=2274&& nCode <2302) return"E";
if (nCode >=2302&& nCode <2433) return"F";
if (nCode >=2433&& nCode <2594) return"G";
if (nCode >=2594&& nCode <2787) return"H";
if (nCode >=2787&& nCode <3106) return"J";
if (nCode >=3106&& nCode <3212) return"K";
if (nCode >=3212&& nCode <3472) return"L";
if (nCode >=3472&& nCode <3635) return"M";
if (nCode >=3635&& nCode <3722) return"N";
if (nCode >=3722&& nCode <3730) return"O";
if (nCode >=3730&& nCode <3858) return"P";
if (nCode >=3858&& nCode <4027) return"Q";
if (nCode >=4027&& nCode <4086) return"R";
if (nCode >=4086&& nCode <4390) return"S";
if (nCode >=4390&& nCode <4558) return"T";
if (nCode >=4558&& nCode <4684) return"W";
if (nCode >=4684&& nCode <4925) return"X";
if (nCode >=4925&& nCode <5249) return"Y";
if (nCode >=5249&& nCode <5590) return"Z";
return"";
        }
#endregion

数据库中 将大写字母 转化为小写字母 可以使用 LOWER(‘stringtoswitch’);

仅提供代码，不要说自己不会调用奥。首次写博客i，希望大家支持。up！