Solved

Field Name with alias

Posted on 2001-06-06
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Last Modified: 2012-05-05
I'm using a recordset in ADO to access data form multiple tables,say,with the following structure:

Table Name : One
Field Names : name

Table Name : One
Field Names : name

Now I say,
rs.Open "select one.name,two.name from one,two",cn
where rs=recordset name
I want to access this recordset with the fieldname(not with ordinal position) as rs("name") etc..It gives me only the first table's value.Is there any way to retrieve using the alias name,ie,for the second table?
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Question by:mukunth
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6 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 6159220
rs.Open "select one.name AS Name_One,two.name AS name_Two from one,two",cn

Now you can access the fields with
rs("name_one") and rs("name_two")

You might however simply try to access the fields by their indexes:
rs(1)

Cheers
0
 
LVL 43

Expert Comment

by:TimCottee
ID: 6159254
The following code, allows me to use the fully qualified field name:

    Dim rstADO As New ADODB.Recordset
    Dim cnnADO As New ADODB.Connection
    cnnADO.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\testbed\cremosa2k.mdb;Persist Security Info=False"
    cnnADO.Open
    rstADO.Open "select MyTable.Name,MyTable1.Name From MyTable,MyTable1", cnnADO, adOpenStatic, adLockReadOnly
    MsgBox rstADO.Fields("MyTable.Name").Value & " / " & rstADO.Fields("MyTable1.Name").Value
    rstADO.Close
    cnnADO.Close
    Set rstADO = Nothing
    Set cnnADO = Nothing

0
 
LVL 1

Author Comment

by:mukunth
ID: 6162355
to angelIII : Yes,I can "alias" the field name itself but is there any property through which I can retrieve the table aliases?


to TimCottee : rs("tablename.fieldname") doesn't work.It says "Item cannot be found in the collection corresponding to the requested ordinal or position"
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 6162583
Yes, you can:

rs("name_one").Properties("BASECOLUMNTABLE")
rs("name_one").Properties("BASECOLUMNNAME")

Should give you the info you are looking for...

Cheers
0
 
LVL 1

Author Comment

by:mukunth
ID: 6162993
To angelIII :

I tried but it didn't return anything.ie.it returns NULL value.Is the following code correct?:

Dim cn As New ADODB.Connection
Dim rs As New ADODB.Recordset

cn.Open "provider=sqloledb;data source=(local);initial catalog=pubs;uid=sa;pwd=;"
rs.Open "select t.i,t1.i from t,t1", cn

Dim i As Integer
For i = 0 To rs("i").Properties.Count - 1
List1.AddItem rs("i").Properties(i).Name & " = " & rs("i").Properties(i).Value
Next

The above adds ALL the properties in the listbox,but most of the properties have NULL as their value including BASETABLENAME and BASECOLUMNNAME.So,what goes?
0
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 25 total points
ID: 6163025
Dim cn As ADODB.Connection
Dim rs As ADODB.Recordset


set cn = new ADODB.Connection
set rs = new ADODB.Recordset

cn.Open "provider=sqloledb;server=(local);initial catalog=pubs;uid=sa;pwd=;"

set rs.ActiveConnection = cn
rs.CursorLocation = adUseClient
rs.LockType = adLockPessimistic
rs.Open "select t.i,t1.i from t,t1", cn

Dim i As Integer
For i = 0 To rs("i").Properties.Count - 1
List1.AddItem rs("i").Properties(i).Name & " = " & rs("i").Properties(i).Value
Next

This worked for me...
It seems that the locking value enforces ADO to get the underlying tablenames and column names...

Cheers

0

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