Floating Point Type??

Jan 21, 2008

I need to write a floating point value to a column in a SQL server database. I have the following line of
code, that formats the float value before passing it off to the stored procedure.

Please look at the line of code below. Does the 8 after SqlDbType.Foat mean that this will be a floating
point with 8 signigicant digits past the decimal point?


mySqlCommand.Parameters.Add("@Price", SqlDbType.Float, 8).Value = float.Parse(InitialPrice);

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Floating Point Calculations...

Nov 9, 2001

Hello all,

I can't see any reason for this error, not having a high level understanding of maths I thought I'd post it and hope someone could share some light on it.

I yesterday got called by a client who said that a payment for £15 + VAT was being passed to their payment gateway as 17.62 when it should be 17.63. The VAT calculation is performed in a SQL Server 2000 stored procedure. In the end I tracked it down and it wasn't a propblem with my calculation.

The price was coming out as 17.63 fine. The stored procedure then had to return this price in pence (17.63 * 100 = 17.63). When I put in a print statement with this calculation it was correct but when I output the variable that the result was assigned to it was coming out as 1762.

The variable that the result was being put into was of real datatype.

I then wrote a udf to test this. Here is the function:

CREATE FUNCTION dbo.POUNDS_TO_PENCE
(
@POUNDVALUE real
)
RETURNS INTEGER
AS
BEGIN

RETURN @POUNDVALUE * 100

END

As you can see nothing very special.

If you run this runction and pass in 17.63 it will return 1762!!!

The bit I don't get is if I change the @POUNDSVALUE intput variable to type float it returns the correct amount.

I've also found that the same problem occurs when passing in £30 + VAT (35.25) + 1pence. So, 35.26 comes out as 3525 instead of 3526. This is the case if you keep doubling the number (and adding a few pence here and there).

Does anyone know why this is or is it a bug in the processor?

The SQL books online say the following about the float and real data types:

--------------------------------------------------------
float and real (T-SQL)
Approximate number data types for use with floating point numeric data. Floating point data is approximate; not all values in the data type range can be precisely represented.

Syntax
float[(n)]
Is a floating point number data from - 1.79E + 308 through 1.79E + 308. n is the number of bits used to store the mantissa of the float number in scientific notation and thus dictates the precision and storage size. n must be a value from 1 through 53.


n is Precision Storage size
1-24 7 digits 4 bytes
25-53 15 digits 8 bytes


The Microsoft® SQL Server™ float[(n)] data type conforms to the SQL-92 standard for all values of n from 1 to 53. The synonym for double precision is float(53).

real
Floating point number data from –3.40E + 38 through 3.40E + 38. Storage size is 4 bytes. In SQL Server, the synonym for real is float(24).


--------------------------------------------------------

Apart from the fact that it says 'Approximate number data types' I can't see any difference between the data type apart from the ranges.

Anyone any ideas?
Thanks
Tom Holder

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Mar 24, 2004

How can I truncate a floating point number to required number of decimal points
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Oct 8, 2007

Hi.

Intermittently, the following error has been displayed when a SQL job on our box (SQL Server 2000 Service Pack 4 running on Windows 2000) runs.

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The intermittent problem over the last two days has become more regular and now does not appear to be related solely to the SQL job. For example, when connecting to the box using my local copy of SQL 2005 Management Studio and I attempt to browse the database objects I get this problem.

To the best of my knowledge, this server has not had any software installed on it and/or nothing has changed on it recently.

It has now got to the point that this particular job no longer runs. The job in question, in case this is significant, is a vanilla stored proc that returns data using OPEN ROWSET to communicate with an Access database (this connectivity has been verified to be okay, in that other similar jobs all run just fine)

If anybody can shed some light and/or point me in the right direction I would be extremely grateful.

Cheers

CG

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Float
Real

I've mixed up !!! all of them can have floating point BUT what's the difference? some advise please!

Thanks in advance.
Kind Regards.

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Since the column is an integer, the query returns only an integer by rounding to the nearest integer. How can I do this? Thanks!

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Oct 26, 2006

Hi,

I got below error in the SQL Server Production Server and i checked in the microsoft site it needs to install SQL Server service pack 4 to resolve the
problem.

"A floating point exception occurred in the user process. Current transaction is canceled"

I need help that i want to reproduce this below problem in the SQL Server environment and tried several ways but no luck.

Please advise me how to reproduce the problem.

Would be appreciate your help.

Regards
Sathish

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Oct 27, 2006

I'm having a problem that I think is due to corrupt data. Depending on
the column I use in my order by clause two problems are occuring.

1. No results are returned and I get this error:
A floating point exception occured in the user process.

2. Results are returned but there are a different number of rows depending on which columns I use in my Order By clause.

Examples
SELECT * FROM SymbolStats
ORDER BY calc_date, symbol

Returns - 12207 rows but only includes one of the 25 dates in the table.

----------

SELECT * from SymbolStats
ORDER BY current_hv

Returns - 0 rows.

----------

SELECT * from SymbolStats
ORDER BY average_hv

Returns - floating point error

With more conditions in the WHERE clause the number of results returned varies greatly.

The
fact that different numbers of rows can be returned from the same query
only differing in how they are ordered seems like a bug.

Does this sound like corrupt data? If so, what are the best methods for fixing it?

Thanks,
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Sep 21, 2005

I'm getting this error:

System.Data.SqlClient.SqlException: A floating point exception occurred in the
user process. Current transaction is canceled. at
System.Data.Common.DbDataAdapter.Update(DataRow[] dataRows, DataTableMapping
tableMapping) at ...etc etc

    when updating one particular table, but not when updating another using nearly the same code.

I've searched and searched on the inet, but with no joy.

Microsoft have several different manifestations of it, under various
different circumstances, but the solutions all seem to involve
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you have to go to university to be competent to do.

In any case, according to Enterprise Manager, I already have SP4
included. On the other hand, the one file of mine I checked the date of
against MS's hotfix file list was 2002 not 2003, so who knows?

My Service Manager is v 8.00.760, and it's the Development Edition (ie it's all running on the one machine).

According to the info on sqlDataAdaptor.update,  the
sqlError that gets returned  as part of the sqlException contains
fields Class, which gives the seriousness of the error, and State,
which identifies the exact error.  I get Class=16 (user-fixable)
and State=1, which we have to go to SQL Books Online to discover the
meaning of.  SQL BO probably sounded like a good idea to W.Gates,
but it took me half an hour to get anywhere near finding out what that
'1' meant.  When I did, it was (guess): 'A floating point
exception occurred in the user process. Current transaction is
canceled.' !!!

Can anyone please tell me what exactly might be causing the error?

Graham Rounce

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I am trying to understand why SQL Server gives me significantly lower precision than many of the other sources that have tried when using the POWER function. My environment is 2008 R2 SP2 (10.50.4000.0 X64, Standard edition) on Windows 2008 X64 SP1

DECLARE @x FLOAT(53) = 1.0004;
DECLARE @y FLOAT(53) = 1.0/12.0;
SELECT POWER(@x,@y)-1; -- Answer: 3.33270904724348E-05
GO
DECLARE @x FLOAT(24) = 1.0004;
DECLARE @y FLOAT(24) = 1.0/12.0;

[URL] ....

Answer: 3.33272237835747E-05

I also tried using Windows Calculator.Answer:3.3327223783495255846580902358195e-5

And an online "high-precision" calculator from [URL] ...

Answer: 3.332722378349525584658E-5

The best SQL results compare only to the fourth digit with other results. Everything else agrees to the 10th or 12th digit.

Is the precision of arithmetic calculations on SQL Server that bad, or am I doing something wrong here? Is there another more precise alternative?

I did the following. The results speak for themselves

DECLARE @x FLOAT(53) = 1.0004;
DECLARE @y FLOAT(53) = 1.0/12.0;
DECLARE @z FLOAT(53) = POWER(@x,@y)-1; -- Answer: 3.33270904724348E-05
SELECT POWER((1+@z),12); -- 1.00039999839968

-- using results from other sources (c#, windows calc, casio.com)
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SELECT POWER((1+3.332722378349525584658E-5),12) -- 1.0004

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This is nutty.  I never got this error on my local machine.  The only lower case m in the sql is by near the variable Ratingsum like in line 59.
 [SqlException (0x80131904): Incorrect syntax near 'm'.An expression of non-boolean type specified in a context where a condition is expected, near 'type'.]   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +925466   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +800118   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +186   System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1932   System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async) +196   System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) +269   System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +135   view_full_article.btnRating_Click(Object Src, EventArgs E) +565   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746</pre></code>
 Here is my button click sub in its entirety:
 1 Sub btnRating_Click(ByVal Src As Object, ByVal E As EventArgs)
2 'Variable declarations...
3 Dim articleid As Integer
4 articleid = Request.QueryString("aid")
5 Dim strSelectQuery, strInsertQuery As String
6 Dim strCon As String
7 Dim conMyConnection As New System.Data.SqlClient.SqlConnection()
8 Dim cmdMyCommand As New System.Data.SqlClient.SqlCommand()
9 Dim dtrMyDataReader As System.Data.SqlClient.SqlDataReader
10 Dim MyHttpAppObject As System.Web.HttpContext = _
11 System.Web.HttpContext.Current
12 Dim strRemoteAddress As String
13 Dim intSelectedRating, intCount As Integer
14 Dim Ratingvalues As Decimal
15 Dim Ratingnums As Decimal
16 Dim Stars As Decimal
17 Dim Comments As String
18 Dim active As Boolean = False
19 Me.lblRating.Text = ""
20 'Get the user's ip address and cast its type to string...
21 strRemoteAddress = CStr(MyHttpAppObject.Request.UserHostAddress)
22 'Build the query string. This time check to see if IP address has already rated this ID.
23 strSelectQuery = "SELECT COUNT(*) As RatingCount "
24 strSelectQuery += "FROM tblArticleRating WHERE Itemid=" & articleid
25 strSelectQuery += " AND ip = '" & strRemoteAddress & "'"
26 'Open the connection, and execute the query...
27 strCon = System.Web.Configuration.WebConfigurationManager.ConnectionStrings("sqlConnectionString").ConnectionString
28 conMyConnection.ConnectionString = strCon
29 conMyConnection.Open()
30 cmdMyCommand.Connection = conMyConnection
31 cmdMyCommand.CommandType = System.Data.CommandType.Text
32 cmdMyCommand.CommandText = strSelectQuery
33 intCount = cmdMyCommand.ExecuteScalar()
34 intSelectedRating = Int(Me.rbRating.Text)
35 conMyConnection.Close()
36 'Close the connection to release these resources...
37
38 If intCount = 0 Then 'The user hasn't rated the article
39 'before, so perform the insert...
40 strInsertQuery = "INSERT INTO tblArticleRating (rating, ip, itemID, comment, active) "
41 strInsertQuery += "VALUES ("
42 strInsertQuery += intSelectedRating & ", '"
43 strInsertQuery += strRemoteAddress & "', "
44 strInsertQuery += articleid & ", '"
45 strInsertQuery += comment.Text & "', '"
46 strInsertQuery += active & "'); "
47 cmdMyCommand.CommandText = strInsertQuery
48 conMyConnection.Open()
49 cmdMyCommand.ExecuteNonQuery()
50 conMyConnection.Close()
51 Me.lblRating.Text = "Thanks for your vote!"
52 Comments = comment.Text.ToString
53
54 If Len(Comments) > 0 Then
55 emailadmin(comment.Text, articleid)
56 End If
57 'now update the article db for the two values but first get the correct ratings for the article
58 strSelectQuery = _
59 "SELECT SUM(rating) As RatingSum, COUNT(*) As RatingCount "
60 strSelectQuery += "FROM tblArticleRating WHERE Itemid=" & articleid
61 conMyConnection.Open()
62 cmdMyCommand.CommandText = strSelectQuery
63 dtrMyDataReader = cmdMyCommand.ExecuteReader()
64 dtrMyDataReader.Read()
65 Ratingvalues = Convert.ToDecimal(dtrMyDataReader("RatingSum").ToString)
66 Ratingnums = Convert.ToDecimal(dtrMyDataReader("RatingCount").ToString)
67 Stars = Ratingvalues / Ratingnums
68 conMyConnection.Close()
69 'Response.Write("Values: " & Ratingvalues)
70 'Response.Write("Votes: " & Ratingnums)
71
72 UpdateRating(articleid, Stars, Ratingnums)
73 Else 'The user has rated the article before, so display a message...
74 Me.lblRating.Text = "You've already rated this article"
75 End If
76 strSelectQuery = _
77 "SELECT SUM(rating) As RatingSum, COUNT(*) As RatingCount "
78 strSelectQuery += "FROM tblArticleRating WHERE Itemid=" & articleid
79 conMyConnection.Open()
80 cmdMyCommand.CommandText = strSelectQuery
81 dtrMyDataReader = cmdMyCommand.ExecuteReader()
82 dtrMyDataReader.Read()
83 Ratingvalues = Convert.ToDecimal(dtrMyDataReader("RatingSum").ToString)
84 Ratingnums = Convert.ToDecimal(dtrMyDataReader("RatingCount").ToString)
85 Stars = Ratingvalues / Ratingnums
86 If (Ratingnums = 1) And (Stars <= 1) Then
87 lblRatingCount.Text =" (" & (String.Format("{0:f2}", Stars)) & ") / " & dtrMyDataReader("RatingCount") & " Vote"
88 ElseIf (Ratingnums = 1) And (Stars > 1) Then
89 lblRatingCount.Text = " (" & (String.Format("{0:f2}", Stars)) & ") / " & dtrMyDataReader("RatingCount") & " Vote"
90 ElseIf (Ratingnums > 1) And (Stars <= 1) Then
91 lblRatingCount.Text =" (" & (String.Format("{0:f2}", Stars)) & ") / " & dtrMyDataReader("RatingCount") & " Votes"
92 ElseIf (Ratingnums > 1) And (Stars > 1) Then
93 lblRatingCount.Text = " (" & (String.Format("{0:f2}", Stars)) & ") / " & dtrMyDataReader("RatingCount") & " Votes"
94 End If
95
96 'Response.Write(String.Format("{0:f2}", Stars))
97 'Response.Write("Values: " & Ratingvalues)
98 'Response.Write("Votes: " & Ratingnums)
99 If (Stars > 0) And (Stars <= 0.5) Then
100 Me.Rating.ImageUrl ="./images/rating/05star.gif"
101 ElseIf (Stars > 0.5) And (Stars < 1.0) Then
102 Me.Rating.ImageUrl = "./images/rating/05star.gif"
103 ElseIf (Stars >= 1.0) And (Stars < 1.5) Then
104 Me.Rating.ImageUrl = "./images/rating/1star.gif"
105 ElseIf (Stars >= 1.5) And (Stars < 2.0) Then
106 Me.Rating.ImageUrl = "./images/rating/15star.gif"
107 ElseIf (Stars >= 2.0) And (Stars < 2.5) Then
108 Me.Rating.ImageUrl = "./images/rating/2star.gif"
109 ElseIf (Stars >= 2.5) And (Stars < 3.0) Then
110 Me.Rating.ImageUrl = "./images/rating/25star.gif"
111 ElseIf (Stars >= 3.0) And (Stars < 3.5) Then
112 Me.Rating.ImageUrl = "./images/rating/3star.gif"
113 ElseIf (Stars >= 3.5) And (Stars < 4.0) Then
114 Me.Rating.ImageUrl = "./images/rating/35star.gif"
115 ElseIf (Stars >= 4.0) And (Stars < 4.5) Then
116 Me.Rating.ImageUrl = "./images/rating/4star.gif"
117 ElseIf (Stars >= 4.5) And (Stars < 5.0) Then
118 Me.Rating.ImageUrl = "./images/rating/45star.gif"
119 ElseIf (Stars >= 4.5) And (Stars <= 5.0) Then
120 Me.Rating.ImageUrl = "./images/rating/5star.gif"
121 End If
122 dtrMyDataReader.Close()
123 conMyConnection.Close()
124 End Sub
 
If you want to reduplicate the error, click over here and try to submit a rating:
http://www.link-exchangers.com/view_full_article.aspx?aid=51
Thanks for helping me figure this out.

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Mar 28, 2008

Happy Friday!
A while since I have posted a question, and this one is probably real easy.
I am trying to store numeric values from a php form in MSSQL 2000 database. However, the columns are set to float and if the value is 1.00, when entered into the table it is saved as 1

If I change the column type to money, the query fails, with an error message of conversion of datatype varchar to datatype money statement terminated.

anybody know what I need to do? do I need to do something in my query to specify that this is NOT varchar data?

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Dec 14, 2007

I like to define my procedure parameter type to match a referenced table colum type,
similar to PL/SQL "table.column%type" notation.
That way, when the table column is changes, I would not have to change my stored proc.
Any suggestion?

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Apr 16, 2008

Hi,

The table in SQL has column Availability Decimal (8,8)

Code in c# using sqlbulkcopy trying to insert values like 0.0000, 0.9999, 29.999 into the field Availability
we tried the datatype float , but it is converting values to scientific expressions€¦(eg: 8E-05) and the values displayed in reports are scientifc expressions which is not expected
we need to store values as is


Error:
base {System.SystemException} = {"The given value of type SqlDecimal from the data source cannot be converted to type decimal of the specified target column."}

"System.InvalidOperationException: The given value of type SqlDecimal from the data source cannot be converted to type decimal of the specified target column. ---> System.InvalidOperationException: The given value of type SqlDecimal from the data source cannot be converted to type decimal of the specified target column. ---> System.ArgumentException: Parameter value '1.0000' is out of range.
--- End of inner exception stack trace ---
at System.Data.SqlClient.SqlBulkCopy.ConvertValue(Object value, _SqlMetaData metadata)
--- End of inner exception stack trace ---
at System.Data.SqlClient.SqlBulkCopy.ConvertValue(Object value, _SqlMetaData metadata)
at System.Data.SqlClient.SqlBulkCopy.WriteToServerInternal()
at System.Data.SqlClient.SqlBulkCopy.WriteRowSourceToServer(Int32 columnCount)
at System.Data.SqlClient.SqlBulkCopy.WriteToServer(DataTable table, DataRowState rowState)
at System.Data.SqlClient.SqlBulkCopy.WriteToServer(DataTable table)
at MS.Internal.MS
COM.AggregateRealTimeDataToSQL.SqlHelper.InsertDataIntoAppServerAvailPerMinute(String data, String appName, Int32 dateID, Int32 timeID) in C:\VSTS\MXPS Shared Services\RealTimeMonitoring\AggregateRealTimeDataToSQL\SQLHelper.cs:line 269"


Code in C#

SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnection, SqlBulkCopyOptions.Default);
DataRow dr;
DataTable dt = new DataTable();
DataColumn dc;

try
{

dc = dt.Columns.Add("Availability", typeof(decimal));
€¦.

dr["Availability"] = Convert.ToDecimal(s[2]); ------ I tried SqlDecimal
€¦€¦€¦.

}
bulkCopy.DestinationTableName = "dbo.[Tbl_Fact_App_Server_AvailPerMinute]";
bulkCopy.WriteToServer(dt);



thx



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Implement time interval type in the form of a user defined type in SS2k8r2? Specifically an interval type described in the book Temporal Data and the Relational Model by C. J. Date at all. As an example, an interval is below:

1/4/2006:1/10/2006

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I am trying to use the Bulk Insert Task to load from a csv file. My final column is a bit that is nullable. My file is an ID column that is int, a date column that is mm/dd/yyy, then 20 columns that are real, and a final column that is bit. I've tried various combinations of codepage and datafiletype on my task component. When I have RAW with Char, I get the error included below. If I change to RAW/Native or codepage 1252, I don't have an issue with the bit; however, errors start generating on the ID and date columns.

I have tried various data type settings on my flat file connection, too. I have tried DT_BOOL and the integer datatypes. Nothing seems to work.

I hope someone can help me work through this.

Thanks in advance,

SK



SSIS package "Package3.dtsx" starting.

Error: 0xC002F304 at Bulk Insert Task, Bulk Insert Task: An error occurred with the following error message: "Cannot fetch a row from OLE DB provider "BULK" for linked server "(null)".The OLE DB provider "BULK" for linked server "(null)" reported an error. The provider did not give any information about the error.The bulk load failed. The column is too long in the data file for row 1, column 24. Verify that the field terminator and row terminator are specified correctly.Bulk load data conversion error (type mismatch or invalid character for the specified codepage) for row 1, column 23 (cancelled).".

Error: 0xC002F304 at Bulk Insert Task 1, Bulk Insert Task: An error occurred with the following error message: "Cannot fetch a row from OLE DB provider "BULK" for linked server "(null)".The OLE DB provider "BULK" for linked server "(null)" reported an error. The provider did not give any information about the error.The bulk load failed. The column is too long in the data file for row 1, column 24. Verify that the field terminator and row terminator are specified correctly.Bulk load data conversion error (type mismatch or invalid character for the specified codepage) for row 1, column 23 (cancelled).".

Task failed: Bulk Insert Task 1

Task failed: Bulk Insert Task

Warning: 0x80019002 at Package3: The Execution method succeeded, but the number of errors raised (2) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors.

SSIS package "Package3.dtsx" finished: Failure.

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Msg 6522, Level 16, State 2, Line 1: System.InvalidCastException: Conversion From Type 'SqlBoolean' To Type 'Boolean' Is Not Val

Mar 6, 2008

I created a function called Temperature in VB to be used as a UDF in SQL2005. I get the error listed below. Any thoughts?


CREATE FUNCTION Temperature(@FluidName SQL_variant, @InpCode SQL_variant, @Units SQL_variant, @Prop1 SQL_variant, @Prop2 SQL_variant)

RETURNS Float

AS EXTERNAL NAME Fluids_VB6.[Fluids_VB6.FluidProperties.Fluids].Temperature

Then ran function:


select dbo.temperature('R22','t','e','225.6','0')

Got this:


Msg 6522, Level 16, State 2, Line 1

A .NET Framework error occurred during execution of user defined routine or aggregate 'Temperature':

System.InvalidCastException: Conversion from type 'SqlBoolean' to type 'Boolean' is not valid.

System.InvalidCastException:

at Microsoft.VisualBasic.CompilerServices.Conversions.ToBoolean(Object Value)

at Fluids_VB6.FluidProperties.Fluids.Setup(Object& FluidName)

at Fluids_VB6.FluidProperties.Fluids.CalcSetup(Object& FluidName, Object& InpCode, Object& Units, Object& Prop1, Object& Prop2)

at Fluids_VB6.FluidProperties.Fluids.CalcProp(Object& FluidName, Object& InpCode, Object& Units, Object& Prop1, Object& Prop2)

at Fluids_VB6.FluidProperties.Fluids.Temperature(Object FluidName, Object InpCode, Object Units, Object Prop1, Object Prop2)

Thanks

Buck

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