Copy Row to same Table in new Database - ms-access

Question

I have very little experience with Access Databases however I have wrote a similar VBA macro in excel. I am trying to copy rows from one .mdb file into the exact same table on a different .mdb file. However I would like it to only import it if it does not already exsist. Could someone please advise me the best way to go about this and maybe some code I can use and modify? I have already looked around stack overflow and can't seem to find any examples that work.
There are 8 different tables and inside these a few hundred rows. with maybe 5-20 columns.
If the script could be made inside VBS this would be ideal, as it would allow me to run the updates without loading into access.
Thanks for any help or advice,
Simon
EDIT -
Zev's answer seems to do the job however I am getting this error, also the MDB inside site2 is the one I am copying from and putting it into site1
Error: Expected end of statement
Code: 800A0401
Line: 17
Char: 13
Code (saved as "update.vbs"):
Dim eng
Set eng = CreateObject("DAO.DBEngine.120")
Set dest = eng.OpenDatabase("C:\Users\simon\Documents\garden games redesign\import script\Site1\ActinicCatalog.mdb")
Sub CopyTable()
Dim rs
Set rs = dest.OpenRecordset("Person")
Dim sWhere
For Each fld In rs.Fields
sWhere = sWhere & " AND " & fld.Name & " <> t1." & fld.Name
Next
sWhere = Mid(sWhere, 6)
Dim sql: sql= _
"INSERT INTO Person " & _
"SELECT * " & _
"FROM Person AS t1 IN ""C:\Users\simon\Documents\garden games redesign\import script\Site2\ActinicCatalog.mdb"" " & _
"WHERE " & sWhere
dest.Execute(sql)
End Sub
Edit for more info:
\Site1\ActinicCatalog.mdb - is destination database
\Site2\ActinicCatalog.mdb - is original database
These databases have about 20 columns

Answer 1

Here is an example to get you started. It copies the content of [Table1] of the current database to [Table1] of a second database.
Option Compare Database
Option Explicit
Sub copyTables()
'Open source database
Dim dSource As Database
Set dSource = CurrentDb
'Open dest database
Dim dDest As Database
Set dDest = DAO.OpenDatabase("C:\Users\Admin\Desktop\DBdest.accdb")
'Open source recordset
Dim rSource As Recordset
Set rSource = dSource.OpenRecordset("Table1", dbOpenForwardOnly)
'Open dest recordset
Dim rDest As Recordset
Set rDest = dDest.OpenRecordset("Table1", dbOpenDynaset)
'Loop through source recordset
While Not rSource.EOF
'Look for record in dest recordset
rDest.FindFirst _
"Field1 = '" & rSource.Fields("Field1") & "' AND " & _
"Field2 = " & rSource.Fields("Field2")
'If not found, copy record - Field1 is text / Field2 is numeric
If rDest.NoMatch Then
rDest.AddNew
rDest.Fields("Field1") = rSource.Fields("Field1")
rDest.Fields("Field2") = rSource.Fields("Field2")
rDest.Update
End If
'Next source record
rSource.MoveNext
Wend
'Close dest recordset
rDest.Close
Set rDest = Nothing
'Close source recordset
rSource.Close
Set rSource = Nothing
'Close dest database
dDest.Close
Set dDest = Nothing
'Close source database
dSource.Close
Set dSource = Nothing
End Sub

Answer 2

I would suggest using an SQL statement if possible. From VBScript using DAO/ACE:
Dim eng
Set eng = CreateObject("DAO.DBEngine.120")
Set dest = eng.OpenDatabase("path\to\destination\database.accdb")
Using ADO:
Dim conn
Set conn = CreateObject("ADODB.Connection")
With conn
.Provider = "Microsoft.ACE.OLEDB.12.0"
.ConnectionString = "Data Source=""path\to\destination\database.accdb"";"
.Open
End With
The SQL statement would be something like this:
INSERT INTO Table1
SELECT *
FROM Table1 AS t1 IN "path\to\source\database.accdb"
WHERE Table1.Field1 <> t1.Field1
and executed like this:
Dim sql = _
"INSERT INTO Table1 " & _
"SELECT * " & _
"FROM Table1 AS t1 IN "path\to\source\database.accdb" " & _
"WHERE Table1.Field1 <> t1.Field1"
'Using DAO or ADO
dest.Execute sql
Considering that each table has a variable number of columns, you might have to generate the WHERE expression dynamically:
Sub CopyTable(tablename)
Dim rs
Set rs = dest.OpenRecordset(tablename)
'if using ADO:
'Set rs = conn.Execute(tablename)
Dim sWhere
For Each fld In rs.Fields
sWhere = sWhere & " AND " & fld.Name & " <> t1." & fld.Name
Next
sWhere = Mid(sWhere, 6)
Dim sql
sql = _
"INSERT INTO " & tablename & " " & _
"SELECT * " & _
"FROM " & tablename & " AS t1 IN ""path\to\source\database.accdb"" " & _
"WHERE " & sWhere
dest.Execute(sql)
End Sub
Update
If you are only using one column to determine whether the record exists, the SQL statement should look like this:
INSERT INTO Table1
SELECT *
FROM Table1 AS t1 IN "path\to\source\database.accdb"
LEFT JOIN Table1 ON t1.FirstField = Table1.FirstField
WHERE Table1.FirstField IS NULL
and CopyTable like this:
Sub CopyTable(tablename)
Dim rs
Set rs = dest.OpenRecordset(tablename)
'if using ADO:
'Set rs = conn.Execute(tablename)
Dim field0Name
field0Name=rs.Fields(0).Name
Dim sql
sql = _
"INSERT INTO " & tablename & " " & _
"SELECT * " & _
"FROM " & tablename & " AS t1 IN ""path\to\source\database.accdb"" " & _
"LEFT JOIN " & tablename & " ON t1." & field0Name & "=" & tablename & "." & field0Name & " " & _
"WHERE " & tablename & "." & field0Name & " IS NULL"
dest.Execute(sql)
End Sub