how to evaluate a string is true ??

  • hello all,

    I am dynamically building a sql query with values from a table. I am getting an error with this station:

    set sql_str = case when @condition then

    assign something to this string

    end

    @condition: a string contains value like : value1 < value2

    Is any function like eval() in sql that I can use? thank you.

    Sherry

  • It would help if you would show us everything instead of just small pieces. Also, what is the expected results you are looking for in the end?

  • I think I understand what you're after, I also think your approach is wrong. But if you're really stuck, sounds like you need to dynamically work out the dynamic SQL (not sure if that even sounds right).

    i.e.

    DECLARE @Condition nvarchar(50)

    SET @Condition = '1 < 2'--your condition, if true then SQL is "SELECT 1", else "SELECT 2"

    DECLARE @sql nvarchar(4000)

    SET @sql = 'SET @sql = CASE WHEN ' + @Condition + ' THEN ''SELECT 1'' ELSE ''SELECT 2'' END'

    exec dbo.sp_executesql @sql, N'@SQL nvarchar(4000) out', @sql out

    --your SQL is ready

    exec dbo.sp_executesql @sql

  • Con Alexis,

    thank you for your reply. I am debugging my code right now . I should post my result later.

    Sherry

  • New issue, I am testing the script. I defined the condition field to be varchar(500) in the table. I queried out the table into a cursor. Everything works. However, when I FETCH into a variable, if it is empty, it returns false when I use this statement to evaluate it: if @condition = '' or isnull(@condition,'') = ''

    what is the value of the @condition?? I declare @condition varchar(500). Please help....

    Sherry;-)

  • I still think it would help us if you showed us the whole problem. We can't see what you see from here and as much as we try, we really aren't mind readers (even if it seems like we are at times, that is just luck).

  • sunpalozzi (1/5/2010)


    New issue, I am testing the script. I defined the condition field to be varchar(500) in the table. I queried out the table into a cursor. Everything works. However, when I FETCH into a variable, if it is empty, it returns false when I use this statement to evaluate it: if @condition = '' or isnull(@condition,'') = ''

    what is the value of the @condition?? I declare @condition varchar(500). Please help....

    Sherry;-)

    I strongly recommend you do what Lynn says. It sounds like you're going down a bad road. Cursors are probably not the way to solve the problem you're working on.

    "The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
    - Theodore Roosevelt

    Author of:
    SQL Server Execution Plans
    SQL Server Query Performance Tuning

  • Hi

    I agree with Lynn about understanding the full problem.

    With this in mind and from what I have been able to gather you want to use this one within a T-SQL predicate.

    Have you tried this.

    [font="Courier New"]CREATE FUNCTION Get_Pos_Sum

    (@fundlist varchar(500) = ' ',

    @assetlist varchar(900),

    @startdate char(10) = ' ',

    @enddate char(10) = ' '

    )

    RETURNS @resultset TABLE

    (

    FUND_IDVARCHAR (8 )NULL,

    ..............

    ..............

    WHERE ........

    -- This is where I use the contents of the input parameter within the

    --prediciate

    --Check to see if asset id's have been passed

    and ((1 = CASE

    WHEN @assetlist =''

    THEN 1 ELSE 2

    END) or CHARINDEX(psd.asset_id,@assetlist1,1) >0 )[/font]

    Although in mine, assetlist is passed in, declaring a @variable and setting it within the procedure should not cause a problem.

    Once again, it would be great to understand the full problem.

    sincerest regards Steve

  • sunpalozzi (1/5/2010)


    New issue, I am testing the script. I defined the condition field to be varchar(500) in the table. I queried out the table into a cursor. Everything works. However, when I FETCH into a variable, if it is empty, it returns false when I use this statement to evaluate it: if @condition = '' or isnull(@condition,'') = ''

    what is the value of the @condition?? I declare @condition varchar(500). Please help....

    Sherry;-)

    It's NULL.

    People can't help you if they can't see what you are doing (or trying to do). As Lynn says above, please post more info.

    “Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

    For fast, accurate and documented assistance in answering your questions, please read this article.
    Understanding and using APPLY, (I) and (II) Paul White
    Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

  • Please copy and paste in sql, so it is easier to read:

    declare @sql_str Nvarchar(4000)

    declare @mrm_fld_name varchar(25),

    @vv varchar(500),

    @condition varchar(1000),

    @er_msg varchar(2000),

    @client_sub_ident int,

    @format char(1),

    @error_cnt int,

    @claim_ident int,

    @himp_ident int,

    @fld_len int

    DECLARE fld_list_cursor CURSOR FOR

    select i.MRM_Fld_Name, fr.Valid_value, fr.condition,

    fr.error_msg, i.format, i.fld_len

    --into temp_odar_validation

    from odar o inner join dbo.PLATFORMS p on

    o.client_sub_ident = p.client_sub_ident

    inner join

    dbo.Odar_PlatForm_FLD_Requirements fr on

    p.platform_ident = fr.Platform_ident inner join Init_Odar_Req_FLDs i on

    fr.Odar_init_Fld_ident = i.ident and fr.mandatory = 1

    where o.SENT = 0 and

    o.client_sub_ident = 9

    group by p.platform_ident, o.CLIENT_SUB_IDENT,

    i.ident, i.MRM_Fld_Name, fr.mandatory, fr.Valid_value,

    fr.condition, fr.error_msg, i.format, i.fld_len

    OPEN fld_list_cursor

    FETCH NEXT FROM fld_list_cursor INTO @mrm_fld_name,

    @vv, @condition, @er_msg, @claim_ident,

    @himp_ident, @format

    WHILE @@FETCH_STATUS = 0

    BEGIN

    set @sql_str = 'INSERT INTO ODAR_DA_ERRORS ( ' +

    ' [ODAR_Ident]' +

    ' ,[Clm_aud_nbr]' +

    ' ,[Procedure_Code]' +

    ' ,[Orig_Procedure_Code_Modifier_1]' +

    ' ,[Charged_Amount]' +

    ' ,[Allowed_Amount]' +

    ' ,[Paid_Amount]' +

    ' ,[Audit_Amount]' +

    ' ,[Coinsurance_Amount]' +

    ' ,[Deductible_Amount]' +

    ' ,[Copay_Amount]' +

    ' ,[First_Date_of_Service]' +

    ' ,[MRM_Claim_Ident]' +

    ' ,[Member_Number]' +

    ' ,[Member_First_Name]' +

    ' ,[Member_Last_Name]' +

    ' ,[Error_Type]' +

    ' ,[Error_Sub_Type]' +

    ' ,[Error_Description]' +

    ' ,[Error_Column_Name]' +

    ' ,[Error_Cleared]) '+

    'select Ident,Clm_aud_nbr, Procedure_code, '+

    'orig_procedure_code_modifier_1, ' +

    'Charged_amount, Allowed_Amount, '+

    'Paid_Amount, Audit_Amount, '+

    'Coinsurance_Amount, Deductible_Amount, '+

    'Copay_Amount,First_Date_of_service, '+

    'MRM_Claim_Ident,Member_Number, ' +

    'Member_First_Name, Member_Last_Name, ' +

    '''Error_Type'' = 2,''Error_Sub_Type'' = 1,' +

    '''Error_Description'' = ''' + @er_msg + ''',' +

    '''Error_Column_Name'' = ''' + @mrm_fld_name + ''',' +

    '''Error_Cleared'' = 0 ' +

    'from ODAR '+

    'where sent = 0 and client_sub_ident = ' +

    convert(varchar,@client_sub_ident) +

    CASE WHEN @VV <> '' AND @CONDITION <> '' THEN

    'AND (' + @mrm_fld_name + 'NOT IN (' +

    @VV + ') OR NOT ' + @CONDITION + ')' ELSE

    CASE WHEN @VV <> '' THEN

    ' AND (' + @mrm_fld_name + ' NOT IN (' +

    @VV + ')'

    WHEN @CONDITION <> '' THEN

    ' AND NOT ' + @CONDITION ELSE ''

    END

    END

    --exec(@sql_str)

    exec @error_cnt = sp_executesql @SQL_STR

    set @intRows = @intRows + @error_cnt

    FETCH NEXT FROM fld_list_cursor INTO @mrm_fld_name,

    @vv, @condition, @er_msg,@client_sub_ident,

    @format

    end

    close fld_list_cursor

    deallocate fld_list_cursor

  • I agree with everything that's been said in this forum . . .

    1) Cursors are BAD, BAD, BAD. If you can come up with a strategy where you don't need them, I strongly advise you do so.

    2) We still don't know what you're trying to accomplish. What are you trying to do with this? If you can give us an idea of your goal (and please put it simply), we can help you out.

    +--------------------------------------------------------------------------------------+
    Check out my blog at https://pianorayk.wordpress.com/

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