One Frontend Different Type Of Backends

Jul 20, 2005

Hello all!!!

For a year and a half now, we have been developing different Access
2000 applications. Most of them are access frontend and access
backends. Some of them have SQL server 2000 as a backend. There is one
application, which consists of a frontend and 3 backend mdb's.
Different companies (80) are using the application:

1. Companies with just one pc and one user.
2. Companies with a Cytrix environment.
3. Companies with Normal network (pc's with WIN 2000, XP, 98, etc).

Recently another company wanted to use the application and this
company has over 50 users and multiple locations. The first thing that
came into my mind was: "let's make another version of the application
with SQL server 2000 as backend", BUT the thing is, we actually just
want one frontend which can communicate with (with normal performance
ofcourse) both the access backend and the sql server backend. This
way, we don't have to solve problems in 2 frontends, but just in one.

My question is, is there anybody who has tried making an access
frontend being able to talk to different kind of backends?

Any help would be appreciated.

Wilco

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The database adminsitrator decided that we use access as frontend for the SQL server which is very annoying because I have a hard time figuring out how to perform certain actions such as drop table queries and so. I have written my own little frontend in coldfusion but I rather work with access for security reasons.

My question:

does anyone have experience with using access as frontend and knows how to use it effectively, or knows where to get a manual? (or even better, a better frontend)

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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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Hi,

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

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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
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--- 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
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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]";
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thx



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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).".

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Task failed: Bulk Insert Task 1

Task failed: Bulk Insert Task

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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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Apr 22, 2004

I have extensively revied both of the design methodologies and I cannot come up with a single clear reason to use one over the other!

Type - Attributes is where you have a table holding the type categories, type, a table holding the type attributes expected and then a table holding the type attribute value:


tbAutombbileCategories
CategoryID | Category
-------------------------------
1 | Car
2 | Truck
3 | Motorcycle

tbAutomobileAttributes
AttributeID | fkCategoryID | Attribute
-------------------------------------------
1 | 1 (car) | Doors
2 | 2 (truck) | Cab
3 | 2 (truck) | Capacity

tbAutomobile
VIN | Category | Make | Model
-------------------------------------
1 | 1 | Honda | Accord
2 | 2 | Ford | F150

tbAutomobileAttributeValues
fkVIN | fkAttributeID | Value
---------------------------------
1 | 1 | 2
2 | 1 | 0
2 | 2 | 1000


Now the above sure is flexible in the sence that a type of automobile can be added without affecting the database schema, but was if some attributes do not take a numeric value? How do you handle computations on attributes specific attributes? Why would I use this structure as opposed to the super type - sub type as shown below?


tbCategories
CategoryID | Category
--------------------------
1 | Cars
2 | Trucks

tbAutomobile (Super Type)
VIN | fkCategoryID | Make | Model
-------------------------------------
1 | 1 |Honda | Accord

tbCars
fkVIN | Doors |
-----------------
1 | 2

tbTrucks
fkVIN | Cab | Capacity
---------------------------
2 | 0 | 1000


Now, adding new sub types probably isn't very flexible but, now you can specify data types for each attribute instead of using sql_variant, which by the documentation cannot be used in aggregate functions and may render poor result when used with ADO.

Regardless of the method used, alot of back end coding is required for computations, what table to send the attributes, etc...

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E.G., what if you wanted to specify attributes about the cap that can be supplied to trucks?


tbTrucks
fkVIN | Cab | Capacity | fkCapID
--------------------------------------
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tbCaps
CapID | Vendor | Price | et....


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SELECT
(



SELECT
MT.MessageId 'MessageId',
MT.MessageType 'MessageType',
FROM MessageTable MT
ORDER BY MT.messageid desc
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)
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Hello --

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Incorrect Syntax Error:

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Could Not Find Type Error:

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What's up??

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