Improve company productivity with a Business Account.Sign Up

x
?
Solved

MS Access metadata?

Posted on 2004-08-30
5
Medium Priority
?
4,775 Views
Last Modified: 2011-04-14
My problem is:
How can I get all table name, column names in a Access file by using queries?
Thankx alot!
0
Comment
Question by:tinh911
  • 2
  • 2
5 Comments
 
LVL 41

Expert Comment

by:shanesuebsahakarn
ID: 11931628
All table names:

SELECT [Name] FROM MSysObjects WHERE [Type]=1

As for field names, you can't retrieve this in a query. You can construct a new table to hold this data though. Run this function to load the table with all the table/field names:

Function GetTableFields()
Dim fld As Field
Dim tdf As TableDef

For Each tdf In CurrentDb.TableDefs
   For Each fld In tdf.Fields
      CurrentDb.Execute "INSERT INTO MyTable ([TableName],[FieldName]) VALUES ('" & tdf.Name & "','" & fld.Name & "')"
   Next
Next
End Function

This assumes you have a table called MyTable containing the fields TableName and FieldName (both text).
0
 

Author Comment

by:tinh911
ID: 11939300
It means that I can't retrieve the field names of a table in a query!
0
 
LVL 41

Accepted Solution

by:
shanesuebsahakarn earned 750 total points
ID: 11941572
If you use the piece of code that I have posted above, you'll have a table containing table and fieldnames, which you can then run a query on to retrieve just the fieldnames of the table that you are interested in, i.e.:

SELECT FieldName FROM MyTable WHERE TableName="SomeTable"

after you've run the code.
0
 

Author Comment

by:tinh911
ID: 12071779
Thank you!
0
 

Expert Comment

by:AxisGroup
ID: 25018806
Here's a simple example that will dump metadata to a table.  Should provide a good starting point.
Public Sub PopulateTableMetadata()
    ' This is a simple procedure that will create a table and
    ' populate it with metadata from the database
    ' It should get you started - modify to suit your specific needs
 
    Dim db As DAO.Database
    Dim tdf As DAO.TableDef
    Dim fld As DAO.Field
    Dim qd As DAO.QueryDef
    Dim rs As DAO.Recordset
    
    Set db = CurrentDb()
    
    ' First create the metadata table, if it doesn't exist
    On Error Resume Next ' allows you to keep going if the table doesn't exist - admitted
    Set tdf = db.TableDefs("table_metadata")
    If tdf Is Nothing Then
        Set tdf = db.CreateTableDef("table_metadata")
        With tdf
            .Fields.Append .CreateField("table_nm", dbText, 255)
            .Fields.Append .CreateField("column_nm", dbText, 255)
            .Fields.Append .CreateField("zero_length_ind", dbBoolean)
            .Fields.Append .CreateField("required_ind", dbBoolean)
            .Fields.Append .CreateField("length_no", dbInteger)
        End With
        db.TableDefs.Append tdf
    Else
        Set qd = db.CreateQueryDef("")
        qd.SQL = "DELETE * FROM table_metadata"
        qd.Execute
    End If
    
    ' Next, populate the table
    Set rs = tdf.OpenRecordset(dbOpenDynaset)
    For Each tdf In db.TableDefs
        For Each fld In tdf.Fields
            With rs
                .AddNew
                !table_nm = tdf.Name
                !column_nm = fld.Name
                !zero_length_ind = fld.AllowZeroLength
                !required_ind = fld.Required
                !length_no = fld.Size
                .Update
            End With
        Next
    Next
    
    rs.Close
    Set rs = Nothing
    Set fld = Nothing
    Set tdf = Nothing
    db.Close
    Set db = Nothing
    
End Sub

Open in new window

0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Implementing simple internal controls in the Microsoft Access application.
When we develop an application in Ms Access 2016 we should also try to protect the queries, macros and table links. I know I may not have a permanent solution but for novice users, they will not manage to break your application. Below is the detail …
In Microsoft Access, learn how to use Dlookup and other domain aggregate functions and one method of specifying a string value within a string. Specify the first argument, which is the expression to be returned: Specify the second argument, which …
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…

585 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question