Microsoft KB Archive/252908

= How To Create a Table with Primary Key Through ADOX =

Article ID: 252908

Article Last Modified on 7/1/2004

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APPLIES TO


 * Microsoft ActiveX Data Objects 2.1
 * Microsoft ActiveX Data Objects 2.1 Service Pack 1
 * Microsoft ActiveX Data Objects 2.1 Service Pack 2
 * Microsoft ActiveX Data Objects 2.5
 * Microsoft ActiveX Data Objects 2.6
 * Microsoft ActiveX Data Objects 2.7
 * Microsoft Visual Basic 5.0 Professional Edition
 * Microsoft Visual Basic 6.0 Professional Edition
 * Microsoft Visual Basic 5.0 Enterprise Edition
 * Microsoft Visual Basic 6.0 Enterprise Edition

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This article was previously published under Q252908



SUMMARY
ADOX is an extension to ActiveX Data Objects that allows the manipulation of the database schema. This article illustrates how to use ADOX to create a table and add a Primary Key.



MORE INFORMATION
NOTE: Not all OLE DB providers support the interfaces required to support ADOX methods. With those providers, you have to use Data Definition Queries or another object model to manipulate the database schema.

The first procedure in the example below creates a new table in an existing Microsoft Access database, creates a new field in that table, then creates a primary key index. When adding a single-field primary key, you do not need to use the ADOX Key object.

The second procedure utilizes the ADOX Key object to add a multiple field key to a table.

Steps to Create the Sample Application
 In Microsoft Visual Basic 5.0 or 6.0, create a new Standard EXE project. Form1 is created by default. On the Project menu, select References to add the following type libraries:

Microsoft ActiveX Data Objects 2.1 Library

Microsoft ADO Ext. 2.1 for DDL and Security

  Add two Command buttons (Command1 and Command2) and the following code to the Form1: Option Explicit

Private Sub Command1_Click ' ' This code adds a single-field Primary key ' Dim Cn As ADODB.Connection, Cat As ADOX.Catalog, objTable As ADOX.Table

Set Cn = New ADODB.Connection Set Cat = New ADOX.Catalog Set objTable = New ADOX.Table

'Open the connection Cn.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=biblio.mdb" 'Open the Catalog Set Cat.ActiveConnection = Cn

'Create the table objTable.Name = "Test_Table" 'Create and Append a new field to the "Test_Table" Columns Collection objTable.Columns.Append "PrimaryKey_Field", adInteger 'Create and Append a new key. Note that we are merely passing 'the "PimaryKey_Field" column as the source of the primary key. This 'new Key will be Appended to the Keys Collection of "Test_Table" objTable.Keys.Append "PrimaryKey", adKeyPrimary, "PrimaryKey_Field"

'Append the newly created table to the Tables Collection Cat.Tables.Append objTable

' clean up objects Set objKey = Nothing Set objTable = Nothing Set Cat = Nothing Cn.Close Set Cn = Nothing End Sub

Private Sub Command2_Click ' ' This code adds a multi-field Primary Key ' Dim Cn As ADODB.Connection, Cat As ADOX.Catalog Dim objTable As ADOX.Table, objKey As ADOX.Key

Set Cn = New ADODB.Connection Set Cat = New ADOX.Catalog Set objTable = New ADOX.Table Set objKey = New ADOX.Key

Cn.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=biblio.mdb" Set Cat.ActiveConnection = Cn objTable.Name = "Test_Table2" objTable.Columns.Append "PrimaryKey_Field1", adInteger objTable.Columns.Append "PrimaryKey_Field2", adInteger objKey.Name = "PrimaryKey" objKey.Type = adKeyPrimary objKey.Columns.Append "PrimaryKey_Field1" objKey.Columns.Append "PrimaryKey_Field2" objTable.Keys.Append objKey Cat.Tables.Append objTable

' clean up objects Set objKey = Nothing Set objTable = Nothing Set Cat = Nothing Cn.Close Set Cn = Nothing End Sub NOTE: You might have to adjust the connect string to point to a valid Jet database.  Run the application and click the Command buttons. You can check the table definitions for Test_Table and TestTable2 in Microsoft Access 97, Microsoft Access 2000, or the Visual Basic Visual Data Manager add-in.

