Cannot Update ID Because Of No Existing Relationship
Mar 5, 2005
I have one table Phone and a table SmsMessage that are linked by the Cellnumber. Cellnumber is the primary key in Phone.
For some reason in the table Phone the Cellnumbers are stored with extra spaces like: '+27000000000 ', but in the SmsMessage table the same value is stored as '+27000000000'. However when I want perform an update to trim the Cellnumbers, I get the message 'Cannot modify values Cellnumber in Phone because there are dependent values in SmsMessage.
The fact is that there are no dependent values, but for MSSQL '+27000000000' and '+27000000000 ' is the same????! Note that the function Len(Cellnumber) gives me the length of the string WITHOUT the spaces as well.
Even if I remove all relationships from Phone, I still get the same error. Are there more places in MSSQL where relationships are stored besides the Diagrams?
Or is there a command that tells MSSQL to ignore all relationships for the next query?
Any ideas?
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May 14, 2007
<----------I
have 2 tables are: 'customers (parent)' and 'open_ac (child)'
<--------I
have tried to insert and update data into sql database by using textboxes
(don't use datagrid)
<--------My
tables details are below
<-------this
table uses for keeping user data
customers
fields:
Column
name
type
length
Description
cu_id
int
4
Primary key
Identifiers
cu_fname
nvarchar
20
allow null
first name
cu_lname
nvarchar
40 allow null
last name
cu_nat
nvarchar
20 allow
null
nationality
cu_add
nvarchar
40 allow null
address
cu_wplace
nvarchar
40 allow
null
workplace
cu_tel
nvarchar
10
allow
null
telephone
cu_fax
nvarchar
10
allow null
fax
cu_email
nvarchar
10 allow
null
email
<----the
open_ac uses for keeping register date/time of customers
open_ac
fields:
Column
name type
length
Description
cu_id
int
4
link key
op_date
date/time
8
register date
<----------my
code
Imports
System.Data.SqlClient
Public Class cus_reg
Inherits System.Web.UI.Page
Dim DS As DataSet
Dim iRec As Integer 'Current Record
Dim m_Error As String = ""
Public Property MyError() As String
Get
Return
m_Error
End Get
Set(ByVal Value As String)
m_Error =
Value
If
Trim(Value) = "" Then
Label3.Visible = False
Else
Label3.Text = Value
Label3.Visible = True
End If
End Set
End Property
Private Sub Page_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
If Not Page.IsPostBack Then
Dim C1 As
New MISSQL
'DS =
C1.GetDataset("select * from customers;select * from open_ac;select * from
accounts")
DS =
C1.GetDataset("select * from customers;select * from open_ac")
Session("data") = DS
iRec = 0
Viewstate("iRec") = iRec
Me.MyDataBind()
Dim Dtr As
DataRow = DS.Tables(0).NewRow
DS.Tables(0).Rows.Add(Dtr)
iRec =
DS.Tables(0).Rows.Count - 1
viewstate("iRec") = iRec
Me.Label2.Text = DateTime.Now
Me.MyDataBind()
Else
DS =
Session("data")
iRec =
ViewState("iRec")
End If
Me.MyError = ""
End Sub
Public Function BindField(ByVal FieldName As String) As
String
Dim DT As DataTable = DS.Tables(0)
Return DT.Rows(iRec)(FieldName)
& ""
End Function
Public Sub MyDataBind()
Label1.Text = "Record : "
& iRec + 1 & " of " & DS.Tables(0).Rows.Count
txtcu_id.DataBind()
txtcu_fname.DataBind()
txtcu_lname.DataBind()
txtcu_add.DataBind()
txtcu_occ.DataBind()
txtcu_wplace.DataBind()
txtcu_nat.DataBind()
txtcu_tel.DataBind()
txtcu_fax.DataBind()
txtcu_email.DataBind()
End Sub
Here is
update code
Private Sub bUpdate_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles bUpdate.Click
Dim DT As DataTable = DS.Tables(0)
Dim DR As DataRow = DT.Rows(iRec)
'Dim DR1 As DataRow = DT1.Rows(iRec)
If DR.RowState = DataRowState.Added
Then
If
txtcu_id.Text.Trim = "" Then
Me.MyError = "please enter your id"
Exit Sub
End If
DR("cu_id")
= txtcu_id.Text
End If
If txtcu_fname.Text.Trim =
"" Then
Me.MyError =
"please enter your name"
Exit Sub
Else
DR("cu_fname") = txtcu_fname.Text
End If
If txtcu_lname.Text.Trim =
"" Then
Me.MyError =
"please enter your last name"
Exit Sub
Else
DR("cu_lname") = txtcu_lname.Text
End If
If txtcu_add.Text.Trim =
"" Then
Me.MyError =
"please enter your address"
Exit Sub
Else
DR("cu_add") = txtcu_add.Text
End If
If txtcu_occ.Text.Trim =
"" Then
Me.MyError =
"please enter your occupation"
Exit Sub
Else
DR("cu_occ") = txtcu_occ.Text
End If
If txtcu_wplace.Text.Trim =
"" Then
Me.MyError =
"please enter your workplace"
Exit Sub
Else
DR("cu_wplace") = txtcu_wplace.Text
End If
If txtcu_nat.Text.Trim =
"" Then
Me.MyError =
"Please enter your nationality"
Exit Sub
Else
DR("cu_nat") = txtcu_nat.Text
End If
If txtcu_tel.Text.Trim =
"" Then
DR("cu_tel") = DBNull.Value
Else
DR("cu_tel") = txtcu_tel.Text
End If
If txtcu_tel.Text.Trim =
"" Then
DR("cu_fax") = DBNull.Value
Else
DR("cu_fax") = txtcu_fax.Text
End If
If txtcu_email.Text.Trim =
"" Then
DR("cu_email") = DBNull.Value
Else
DR("cu_email") = txtcu_email.Text
End If
Dim Strsql As String
If DR.RowState = DataRowState.Added
Then
Strsql =
"insert into customers (cu_id,cu_fname,cu_lname,cu_add,cu_occ,cu_wplace,cu_nat,cu_tel,cu_fax,cu_email)
values (@P1,@P2,@P3,@P4,@P5,@P6,@P7,@P8,@P9,@P10)"
Else
Strsql =
"update customers set
cu_fname=@P2,cu_lname=@P3,cu_add=@P4,cu_occ=@P5,cu_wplace=@P6,cu_nat=@P7,cu_tel=@P8,cu_fax=@P9,cu_email=@P10
where cu_id =@P1"
End If
Dim C1 As New MISSQL
Dim cmd As SqlCommand =
C1.CreateCommand(Strsql)
C1.CreateParam(cmd,
"ITTTTTTTTT")
cmd.Parameters("@P1").Value = DR("cu_id")
cmd.Parameters("@P2").Value
= DR("cu_fname")
cmd.Parameters("@P3").Value = DR("cu_lname")
cmd.Parameters("@P4").Value = DR("cu_add")
cmd.Parameters("@P5").Value = DR("cu_occ")
cmd.Parameters("@P6").Value = DR("cu_wplace")
cmd.Parameters("@P7").Value
= DR("cu_nat")
cmd.Parameters("@P8").Value = DR("cu_tel")
cmd.Parameters("@P9").Value = DR("cu_fax")
cmd.Parameters("@P10").Value = DR("cu_email")
Dim Y As Integer = C1.Execute(cmd)
If Y > 0 Then
DR.AcceptChanges()
Else
Me.MyError =
"Can not register"
End If
<---------code above in this sub it can update only customers tables and when I tried to coding below<------------it alerts can not update
Dim DT1 As DataTable = DS.Tables(1)
Dim DR1 As DataRow = DT1.Rows(iRec)
If DR1.RowState = DataRowState.Added
Then
If
txtcu_id.Text.Trim = "" Then
Me.MyError = "Please enter id"
Exit Sub
End If
DR1("cu_id")
= txtcu_id.Text
End If
If Label2.Text.Trim = ""
Then
DR1("op_date") = Label2.Text
End If
Dim StrSql1 As String
If DR1.RowState =
DataRowState.Deleted Then
StrSql1 =
"insert into open_ac (cu_id,op_date) values (@P13,@P14)"
Else
StrSql1 =
"update open_ac set op_date=@P14 where cu_id=@P13"
End If
Dim C2 As New MISSQL
Dim cmd2 As SqlCommand =
C2.CreateCommand(StrSql1)
C2.CreateParam(cmd2, "ID")
cmd2.Parameters("@P1").Value = DR1("cu_id")
cmd2.Parameters("@P2").Value = DR1("op_date")
Dim Y1 As Integer = C2.Execute(cmd2)
If Y1 > 0 Then
DR1.AcceptChanges()
Else
Me.MyError =
"Can not register"
End If
End Sub
End Class
<------this
is class I use for connecting to database and call parameters....
MISSQL
class
Imports
System.Data.SqlClient
Public Class MISSQL
Dim PV As String =
"Server=web_proj;uid=sa;pwd=sqldb;"
Dim m_Database As String = "c1_itc"
Public Strcon As String
Public Sub New()
Strcon = PV &
"database=" & m_Database
End Sub
Public Sub New(ByVal DBName As String)
m_Database = DBName
Strcon = PV &
"database=" & m_Database
End Sub
Public Property Database() As String
Get
Return
m_Database
End Get
Set(ByVal Value As String)
m_Database =
Value
Strcon = PV
& "database=" & m_Database
End Set
End Property
Public Function GetDataset(ByVal Strsql As String, _
Optional ByVal DatasetName As String
= "Dataset1", _
Optional ByVal TableName As String =
"Table") As DataSet
Dim DA As New SqlDataAdapter(Strsql,
Strcon)
Dim DS As New DataSet(DatasetName)
Try
DA.Fill(DS,
TableName)
Catch x1 As Exception
Err.Raise(60002, , x1.Message)
End Try
Return DS
End Function
Public Function GetDataTable(ByVal Strsql As String, _
Optional ByVal TableName As
String = "Table") As DataTable
Dim DA As New SqlDataAdapter(Strsql,
Strcon)
Dim DT As New DataTable(TableName)
Try
DA.Fill(DT)
Catch x1 As Exception
Err.Raise(60002, , x1.Message)
End Try
Return DT
End Function
Public Function CreateCommand(ByVal Strsql As String) As
SqlCommand
Dim cmd As New SqlCommand(Strsql)
Return cmd
End Function
Public Function Execute(ByVal Strsql As String) As
Integer
Dim cmd As New SqlCommand(Strsql)
Dim X As Integer = Me.Execute(cmd)
Return X
End Function
Public Function Execute(ByRef Cmd As SqlCommand) As
Integer
Dim Cn As New SqlConnection(Strcon)
Cmd.Connection = Cn
Dim X As Integer
Try
Cn.Open()
X =
Cmd.ExecuteNonQuery()
Catch
X = -1
Finally
Cn.Close()
End Try
Return X
End Function
Public Sub CreateParam(ByRef Cmd As SqlCommand, ByVal
StrType As String)
'T:Text, M:Memo, Y:Currency,
D:Datetime, I:Integer, S:Single, B:Boolean, P: Picture
Dim i As Integer
Dim j As String
For i = 1 To Len(StrType)
j =
UCase(Mid(StrType, i, 1))
Dim P1 As
New SqlParameter
P1.ParameterName = "@P" & i
Select Case
j
Case "T"
P1.SqlDbType = SqlDbType.NVarChar
Case "M"
P1.SqlDbType = SqlDbType.Text
Case "Y"
P1.SqlDbType = SqlDbType.Money
Case "D"
P1.SqlDbType = SqlDbType.DateTime
Case "I"
P1.SqlDbType = SqlDbType.Int
Case "S"
P1.SqlDbType = SqlDbType.Decimal
Case "B"
P1.SqlDbType = SqlDbType.Bit
Case "P"
P1.SqlDbType = SqlDbType.Image
End Select
Cmd.Parameters.Add(P1)
Next
End Sub
End Class
<-------Thank you in advance<-------and Thank you very much for all help
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Jul 23, 2005
I created 2 tables with one to one relationship. if I add a record intable A, how does table B record get created? Does SQL do thisautomatically because it is one to one relationship? or do I need tocreate a trigger? if i need a trigger, how do I get the ID of newrecord to create the same ID in table B?thanks for any help.Joe Klein
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Oct 10, 2005
Hi,Do you guys know what's wrong with a one-to-one relationship?The reason I want to make it like this is that at the very end of the chain,the set of keys is huge. I want to limit the number of columns to be thekey. i.e. the [company] table has 1 column as the key. The [employee]table will have 2 columns as the key.e,g,If I add a [sale] table to the [company]-[employee] relationship, the thirdtablewill have 3 columns as the key -- "company id", "employee id", and "saleid".(e.g.)I have a company with many employees and computers. But instead of classifyall these, I just want to call all these as an entity. A company is anentity. An employee is just another entity. etc.So, instead of a one-to-many:[company]---*[employee]---*[sale]||*[computer]I make it one-to-one.[entity]---*[entity]If I want to know the name and address of the entity "employee", I will havea 1-to-1 table [employee] to look up the information for this employeeentity.[entity]---*[entity]||[company]||[employee]||[computer]||[sale]--[color=blue]> There is no answer.> There has not been an answer.> There will not be an answer.> That IS the answer!> And I am screwed.> Deadline was due yesterday.>> There is no point to life.> THAT IS THE POINT.> And we are screwed.> We will run out of oil soon.[/color]
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Feb 14, 2006
How do I create a one to one relationship in a SQL2005 Express database? The foreign key needs to be the same as the primary key so it can't just increment to the next number.
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Nov 17, 2007
Hi.
I get this error when i try to create a relationship in a db diagram (sql 2005)
"'tblActivedir' table saved successfully
'tblClient' table
- Unable to create relationship 'FK_tblClient_tblActivedir1'.
Introducing FOREIGN KEY constraint 'FK_tblClient_tblActivedir1' on table 'tblClient' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.
Could not create constraint. See previous errors."
What i have is 2 tables.
1 named client
1 named activedir
In the client table the columns i want to bind with activedirtable are FR1 and DC1
I want to bind them in the ID of the activedir table (both, in different fk relationships) so that they get the id of activedir.
Fr1 has an fk relationship with activedir (pk is activedir' id)
and DC1 exactly the same in another fk.
So i want both columns to comunicate with activedir.
If p.e. activedir has 3 elements (a,b,c) when i delete element a then werever FR1 or DC1 have this element(binded to it's id) then the element will also be deleted (id of the element) from both FR1 and DC1
I don't want to set Delete and Update action to none because i want the element changed or deleted from activedir, to do the same on Fr1 or DC1 or both.
Any help?
Thanks.
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Nov 2, 2006
I am trying to create a 1:1 relationship, but not primary key to primary key. In table 1 I have a uniqueidentifier as a primary key. In table 2 I have an int as the primary key and a column that takes the uniqueidentifier from table 1. Everytime I drag and drop the relationship line and link table 1 to table 2 it creates a 1:N relationship: ie. tbl1.primarykey links to tbl2.column2. So I'm not linking primary key to primary key however I still want a 1:1 relationship.
How do I do that?
Thanks in advance.
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