IF object_id('dbo.FNGetLunarYearId') IS NOT NULL
BEGIN
    DROP FUNCTION dbo.FNGetLunarYearId
END
GO


CREATE FUNCTION dbo.FNGetLunarYearId 
(
    @Year INT
)
RETURNS INT
BEGIN
    IF @Year >= 2000 
    BEGIN
        RETURN (SELECT FDataInt FROM 
        (SELECT  2000 AS FYear,51552 AS FDataInt
         UNION ALL SELECT 2001 AS FYear,55636 AS FDataInt
         UNION ALL SELECT 2002 AS FYear,54432 AS FDataInt
         UNION ALL SELECT 2003 AS FYear,55888 AS FDataInt
         UNION ALL SELECT 2004 AS FYear,30034 AS FDataInt
         UNION ALL SELECT 2005 AS FYear,22176 AS FDataInt
         UNION ALL SELECT 2006 AS FYear,43959 AS FDataInt
         UNION ALL SELECT 2007 AS FYear,9680 AS FDataInt
         UNION ALL SELECT 2008 AS FYear,37584 AS FDataInt
         UNION ALL SELECT 2009 AS FYear,51893 AS FDataInt
         UNION ALL SELECT 2010 AS FYear,43344 AS FDataInt
         UNION ALL SELECT 2011 AS FYear,46240 AS FDataInt
         UNION ALL SELECT 2012 AS FYear,47780 AS FDataInt
         UNION ALL SELECT 2013 AS FYear,44368 AS FDataInt
         UNION ALL SELECT 2014 AS FYear,21977 AS FDataInt
         UNION ALL SELECT 2015 AS FYear,19360 AS FDataInt
         UNION ALL SELECT 2016 AS FYear,42416 AS FDataInt
         UNION ALL SELECT 2017 AS FYear,86390 AS FDataInt
         UNION ALL SELECT 2018 AS FYear,21168 AS FDataInt
         UNION ALL SELECT 2019 AS FYear,43312 AS FDataInt
         UNION ALL SELECT 2020 AS FYear,31060 AS FDataInt
         UNION ALL SELECT 2021 AS FYear,27296 AS FDataInt
         UNION ALL SELECT 2022 AS FYear,44368 AS FDataInt
         UNION ALL SELECT 2023 AS FYear,23378 AS FDataInt
         UNION ALL SELECT 2024 AS FYear,19296 AS FDataInt
         UNION ALL SELECT 2025 AS FYear,42726 AS FDataInt
         UNION ALL SELECT 2026 AS FYear,42208 AS FDataInt
         UNION ALL SELECT 2027 AS FYear,53856 AS FDataInt
         UNION ALL SELECT 2028 AS FYear,60005 AS FDataInt
         UNION ALL SELECT 2029 AS FYear,54576 AS FDataInt
         UNION ALL SELECT 2030 AS FYear,23200 AS FDataInt
         UNION ALL SELECT 2031 AS FYear,30371 AS FDataInt
         UNION ALL SELECT 2032 AS FYear,38608 AS FDataInt
         UNION ALL SELECT 2033 AS FYear,19415 AS FDataInt
         UNION ALL SELECT 2034 AS FYear,19152 AS FDataInt
         UNION ALL SELECT 2035 AS FYear,42192 AS FDataInt
         UNION ALL SELECT 2036 AS FYear,118966 AS FDataInt
         UNION ALL SELECT 2037 AS FYear,53840 AS FDataInt
         UNION ALL SELECT 2038 AS FYear,54560 AS FDataInt
         UNION ALL SELECT 2039 AS FYear,56645 AS FDataInt
         UNION ALL SELECT 2040 AS FYear,46496 AS FDataInt
         UNION ALL SELECT 2041 AS FYear,22224 AS FDataInt
         UNION ALL SELECT 2042 AS FYear,21938 AS FDataInt
         UNION ALL SELECT 2043 AS FYear,18864 AS FDataInt
         UNION ALL SELECT 2044 AS FYear,42359 AS FDataInt
         UNION ALL SELECT 2045 AS FYear,42160 AS FDataInt
         UNION ALL SELECT 2046 AS FYear,43600 AS FDataInt
         UNION ALL SELECT 2047 AS FYear,111189 AS FDataInt
         UNION ALL SELECT 2048 AS FYear,27936 AS FDataInt
         UNION ALL SELECT 2049 AS FYear,44448 AS FDataInt
         ) AS T   
         WHERE FYear = @Year)
    END
    ELSE IF @Year >= 1950
    BEGIN
        RETURN (SELECT FDataInt FROM 
        (SELECT 1950 AS FYear,27808 AS FDataInt
         UNION ALL SELECT 1951 AS FYear,46416 AS FDataInt
         UNION ALL SELECT 1952 AS FYear,86869 AS FDataInt
         UNION ALL SELECT 1953 AS FYear,19872 AS FDataInt
         UNION ALL SELECT 1954 AS FYear,42448 AS FDataInt
         UNION ALL SELECT 1955 AS FYear,83315 AS FDataInt
         UNION ALL SELECT 1956 AS FYear,21200 AS FDataInt
         UNION ALL SELECT 1957 AS FYear,43432 AS FDataInt
         UNION ALL SELECT 1958 AS FYear,59728 AS FDataInt
         UNION ALL SELECT 1959 AS FYear,27296 AS FDataInt
         UNION ALL SELECT 1960 AS FYear,44710 AS FDataInt
         UNION ALL SELECT 1961 AS FYear,43856 AS FDataInt
         UNION ALL SELECT 1962 AS FYear,19296 AS FDataInt
         UNION ALL SELECT 1963 AS FYear,43748 AS FDataInt
         UNION ALL SELECT 1964 AS FYear,42352 AS FDataInt
         UNION ALL SELECT 1965 AS FYear,21088 AS FDataInt
         UNION ALL SELECT 1966 AS FYear,62051 AS FDataInt
         UNION ALL SELECT 1967 AS FYear,55632 AS FDataInt
         UNION ALL SELECT 1968 AS FYear,23383 AS FDataInt
         UNION ALL SELECT 1969 AS FYear,22176 AS FDataInt
         UNION ALL SELECT 1970 AS FYear,38608 AS FDataInt
         UNION ALL SELECT 1971 AS FYear,19925 AS FDataInt
         UNION ALL SELECT 1972 AS FYear,19152 AS FDataInt
         UNION ALL SELECT 1973 AS FYear,42192 AS FDataInt
         UNION ALL SELECT 1974 AS FYear,54484 AS FDataInt
         UNION ALL SELECT 1975 AS FYear,53840 AS FDataInt
         UNION ALL SELECT 1976 AS FYear,54616 AS FDataInt
         UNION ALL SELECT 1977 AS FYear,46400 AS FDataInt
         UNION ALL SELECT 1978 AS FYear,46496 AS FDataInt
         UNION ALL SELECT 1979 AS FYear,103846 AS FDataInt
         UNION ALL SELECT 1980 AS FYear,38320 AS FDataInt
         UNION ALL SELECT 1981 AS FYear,18864 AS FDataInt
         UNION ALL SELECT 1982 AS FYear,43380 AS FDataInt
         UNION ALL SELECT 1983 AS FYear,42160 AS FDataInt
         UNION ALL SELECT 1984 AS FYear,45690 AS FDataInt
         UNION ALL SELECT 1985 AS FYear,27216 AS FDataInt
         UNION ALL SELECT 1986 AS FYear,27968 AS FDataInt
         UNION ALL SELECT 1987 AS FYear,44870 AS FDataInt
         UNION ALL SELECT 1988 AS FYear,43872 AS FDataInt
         UNION ALL SELECT 1989 AS FYear,38256 AS FDataInt
         UNION ALL SELECT 1990 AS FYear,19189 AS FDataInt
         UNION ALL SELECT 1991 AS FYear,18800 AS FDataInt
         UNION ALL SELECT 1992 AS FYear,25776 AS FDataInt
         UNION ALL SELECT 1993 AS FYear,29859 AS FDataInt
         UNION ALL SELECT 1994 AS FYear,59984 AS FDataInt
         UNION ALL SELECT 1995 AS FYear,27480 AS FDataInt
         UNION ALL SELECT 1996 AS FYear,21952 AS FDataInt
         UNION ALL SELECT 1997 AS FYear,43872 AS FDataInt
         UNION ALL SELECT 1998 AS FYear,38613 AS FDataInt
         UNION ALL SELECT 1999 AS FYear,37600 AS FDataInt
         )AS T   
         WHERE FYear = @Year)

    END
    ELSE 
    BEGIN
    RETURN ISNULL ( (SELECT FDataInt FROM 
        (SELECT 1900 AS FYear,19416 AS FDataInt
         UNION ALL SELECT 1901 AS FYear,19168 AS FDataInt
         UNION ALL SELECT 1902 AS FYear,42352 AS FDataInt
         UNION ALL SELECT 1903 AS FYear,21717 AS FDataInt
         UNION ALL SELECT 1904 AS FYear,53856 AS FDataInt
         UNION ALL SELECT 1905 AS FYear,55632 AS FDataInt
         UNION ALL SELECT 1906 AS FYear,91476 AS FDataInt
         UNION ALL SELECT 1907 AS FYear,22176 AS FDataInt
         UNION ALL SELECT 1908 AS FYear,39632 AS FDataInt
         UNION ALL SELECT 1909 AS FYear,21970 AS FDataInt
         UNION ALL SELECT 1910 AS FYear,19168 AS FDataInt
         UNION ALL SELECT 1911 AS FYear,42422 AS FDataInt
         UNION ALL SELECT 1912 AS FYear,42192 AS FDataInt
         UNION ALL SELECT 1913 AS FYear,53840 AS FDataInt
         UNION ALL SELECT 1914 AS FYear,119381 AS FDataInt
         UNION ALL SELECT 1915 AS FYear,46400 AS FDataInt
         UNION ALL SELECT 1916 AS FYear,54944 AS FDataInt
         UNION ALL SELECT 1917 AS FYear,44450 AS FDataInt
         UNION ALL SELECT 1918 AS FYear,38320 AS FDataInt
         UNION ALL SELECT 1919 AS FYear,84343 AS FDataInt
         UNION ALL SELECT 1920 AS FYear,18800 AS FDataInt
         UNION ALL SELECT 1921 AS FYear,42160 AS FDataInt
         UNION ALL SELECT 1922 AS FYear,46261 AS FDataInt
         UNION ALL SELECT 1923 AS FYear,27216 AS FDataInt
         UNION ALL SELECT 1924 AS FYear,27968 AS FDataInt
         UNION ALL SELECT 1925 AS FYear,109396 AS FDataInt
         UNION ALL SELECT 1926 AS FYear,11104 AS FDataInt
         UNION ALL SELECT 1927 AS FYear,38256 AS FDataInt
         UNION ALL SELECT 1928 AS FYear,21234 AS FDataInt
         UNION ALL SELECT 1929 AS FYear,18800 AS FDataInt
         UNION ALL SELECT 1930 AS FYear,25958 AS FDataInt
         UNION ALL SELECT 1931 AS FYear,54432 AS FDataInt
         UNION ALL SELECT 1932 AS FYear,59984 AS FDataInt
         UNION ALL SELECT 1933 AS FYear,28309 AS FDataInt
         UNION ALL SELECT 1934 AS FYear,23248 AS FDataInt
         UNION ALL SELECT 1935 AS FYear,11104 AS FDataInt
         UNION ALL SELECT 1936 AS FYear,100067 AS FDataInt
         UNION ALL SELECT 1937 AS FYear,37600 AS FDataInt
         UNION ALL SELECT 1938 AS FYear,116951 AS FDataInt
         UNION ALL SELECT 1939 AS FYear,51536 AS FDataInt
         UNION ALL SELECT 1940 AS FYear,54432 AS FDataInt
         UNION ALL SELECT 1941 AS FYear,120998 AS FDataInt
         UNION ALL SELECT 1942 AS FYear,46416 AS FDataInt
         UNION ALL SELECT 1943 AS FYear,22176 AS FDataInt
         UNION ALL SELECT 1944 AS FYear,107956 AS FDataInt
         UNION ALL SELECT 1945 AS FYear,9680 AS FDataInt
         UNION ALL SELECT 1946 AS FYear,37584 AS FDataInt
         UNION ALL SELECT 1947 AS FYear,53938 AS FDataInt
         UNION ALL SELECT 1948 AS FYear,43344 AS FDataInt
         UNION ALL SELECT 1949 AS FYear,46423 AS FDataInt
         )AS T   
         WHERE FYear = @Year),0)

    END
    RETURN 0
END
GO


IF object_id('dbo.PConvertLunar','P') IS NOT NULL
BEGIN
    DROP PROCEDURE dbo.PConvertLunar
END
GO


IF object_id('dbo.PConvertLunar','P') IS NOT NULL
BEGIN
    DROP PROCEDURE dbo.PConvertLunar
END
GO

IF OBJECT_ID('TLunarCache#') IS NULL
BEGIN
    CREATE TABLE TLunarCache#
    (
        FGregorian VARCHAR(10),
        FLunar VARCHAR(10),
        CONSTRAINT PK_LUNAR_CACHE  PRIMARY KEY CLUSTERED(FGregorian)
    )
    CREATE NONCLUSTERED INDEX IX_LUNAR_CACHE_LUNAR ON TLunarCache# (FLunar)
END
GO

CREATE PROCEDURE dbo.PConvertLunar 
(
    @Type CHAR,  --'L' 转换成农历, 'G'转换成公历
    @Source VARCHAR(10),
    @Dest VARCHAR(10) OUTPUT
)
AS
BEGIN
    
    IF @Type = 'G'
    BEGIN
        SELECT @Dest = MIN(FGregorian)
          FROM TLunarCache# WITH(NOLOCK)
         WHERE FLunar = @Source
    END
    ELSE IF @Type = 'L'
    BEGIN
        SELECT @Dest = FLunar
          FROM TLunarCache# WITH(NOLOCK)
         WHERE FGregorian = @Source
    END
    ELSE
    BEGIN
        RETURN
    END

    IF @Dest IS NOT NULL
    BEGIN
        RETURN
    END
    
    DECLARE @Year INT
    SELECT @Year = LEFT(@Source,4) 
    IF @Year < 1901 OR @Year > 2049
    BEGIN
        SELECT @Dest = ''
        RETURN
    END
    
    --如果没有缓存, 就生成前后两年的农历
    DECLARE @FromDate DATETIME
    DECLARE @ToDate DATETIME
    DECLARE @Lunar VARCHAR(10)
    IF @Year = 1901 
    BEGIN
        SELECT @FromDate = CAST(@Year AS VARCHAR(4)) + '-01-01'
    END
    ELSE
    BEGIN
        SELECT @FromDate = DATEADD(YEAR,-1,LEFT(@Source,4) + '-01-01')
    END       
    
    IF @Year = 2049
    BEGIN
        SELECT @ToDate = CAST(@Year AS VARCHAR(4)) + '-12-31'
    END
    ELSE
    BEGIN
        SELECT @ToDate = DATEADD(YEAR,1,LEFT(@Source,4) + '-12-31')
    END
           
    --农转公
    IF @Type = 'G'
    BEGIN
        WHILE(@FromDate <= @ToDate)
        BEGIN
            IF NOT EXISTS(SELECT 1 FROM TLunarCache# WHERE FGregorian = @FromDate)
            BEGIN
            
                SELECT @Lunar = dbo.FNGetLunar(@FromDate)
                IF @Lunar = @Source
                BEGIN
                    SELECT @Dest = CONVERT(VARCHAR(10),@FromDate,23)
                END
                
                INSERT TLunarCache#(FGregorian,FLunar)
                SELECT CONVERT(VARCHAR(10),@FromDate,23),@Lunar
            END
            SELECT @FromDate = DATEADD(DAY,1,@FromDate)
        END
    END
    ELSE
    BEGIN
        WHILE(@FromDate <= @ToDate)
        BEGIN
            IF NOT EXISTS(SELECT 1 FROM TLunarCache# WHERE FGregorian = @FromDate)
            BEGIN
                SELECT @Lunar = dbo.FNGetLunar(@FromDate)
                INSERT TLunarCache#(FGregorian,FLunar)
                SELECT CONVERT(VARCHAR(10),@FromDate,23),@Lunar
            END
            SELECT @FromDate = DATEADD(DAY,1,@FromDate)
        END
        SELECT @Dest = dbo.FNGetLunar(@Source)
    END
END
GO

IF object_id('dbo.FNGetLunar') IS NOT NULL
BEGIN
    DROP FUNCTION dbo.FNGetLunar
END
GO


CREATE FUNCTION dbo.FNGetLunar (@Date DATETIME)
RETURNS VARCHAR(10)
BEGIN
    declare @soldata int      
    declare @offset int      
    declare @ilunar int      
    declare @i int       
    declare @j int       
    declare @ydays int      
    declare @mdays int      
    declare @mleap int  
    declare @mleap1 int    
    declare @mleapnum int      
    declare @bleap smallint      
    declare @temp int      
    declare @year nvarchar(10)       
    declare @month nvarchar(10)      
    declare @day nvarchar(10)  
    declare @chinesenum nvarchar(10)         
    declare @outputdate nvarchar(30)       
    set @offset=datediff(day,'1900-01-30',@Date)      
    --确定农历年开始      
    set @i=1900      
    --set @offset=@soldata      
    while @i<2050 and @offset>0      
    begin      
        set @ydays=348      
        set @mleapnum=0      
        select @ilunar=dbo.FNGetLunarYearId(@i)   
     
        --传回农历年的总天数      
        set @j=32768      
        while @j>8      
        begin      
            if @ilunar & @j >0      
                set @ydays=@ydays+1      
            set @j=@j/2      
        end      
        --传回农历年闰哪个月 1-12 , 没闰传回 0      
        set @mleap = @ilunar & 15      
        --传回农历年闰月的天数 ,加在年的总天数上      
        if @mleap > 0      
        begin      
            if @ilunar & 65536 > 0      
                set @mleapnum=30      
            else       
                set @mleapnum=29           
            set @ydays=@ydays+@mleapnum      
        end      
        set @offset=@offset-@ydays      
        set @i=@i+1      
    end      
    
    if @offset <= 0      
    begin      
        set @offset=@offset+@ydays      
        set @i=@i-1      
        select @ilunar=dbo.FNGetLunarYearId(@i)   
    end      
    
    --确定农历年结束        
    set @year=@i      
    --确定农历月开始      
    set @i = 1      
    --判断那个月是润月      
    set @mleap = @ilunar & 15  
    set @bleap = 0     
    while @i < 13 and @offset > 0      
    begin      
        --判断润月      
        set @mdays=0      
        if (@mleap > 0 and @i = (@mleap+1) and @bleap=0)      
        begin--是润月      
            set @i=@i-1      
            set @bleap=1 
            set @mleap1= @mleap              
            --传回农历年闰月的天数      
            if @ilunar & 65536 > 0      
                set @mdays = 30      
            else       
                set @mdays = 29      
        end      
        else      
        --不是润月      
        begin      
            set @j=1      
            set @temp = 65536       
            while @j<=@i      
            begin      
                set @temp=@temp/2      
                set @j=@j+1      
            end      
         
            if @ilunar & @temp > 0      
                set @mdays = 30      
            else      
                set @mdays = 29      
        end      
           
        --解除润月    
        if @bleap=1 and @i= (@mleap+1)    
            set @bleap=0    
       
        set @offset=@offset-@mdays      
        set @i=@i+1      
    end      
       
    if @offset <= 0      
    begin      
        set @offset=@offset+@mdays      
        set @i=@i-1      
    end      
     
    --确定农历月结束        
    set @month=@i    
       
    --确定农历日结束        
    set @day=ltrim(@offset) 
    --输出日期

    SELECT @outputdate = @year + '-' + RIGHT('0' + @month,2) + '-' + RIGHT('0' + @day,2)
    
    return @outputdate
END
GO