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How to create a table in Sql server from a datareader.GetSchemaTable DataTable

Posted on 2008-01-30
Medium Priority
Last Modified: 2013-11-24
Can anyone help me with VB.NET code to create a table in Sql server from a datareader.GetSchemaTable DataTable?

I'm having trouble with comparing the datatype column and converting it.

I need a way to convert dBASE IV tables to SQL Server tables on the fly.
Question by:straucha
  • 3
LVL 12

Expert Comment

ID: 20784242

Could you tell us more about your datatype problems? Are the GetSchemaTable not getting the correct type (DataType should be mapped to the .NET Framework type of the column.)

Are you using T-SQL or SMO to create the datatable in SQL Server?
LVL 12

Accepted Solution

vb_jonas earned 2000 total points
ID: 20784453
Here's code I wrote to test creating a datatable from datareader.GetSchemaTable:
 Sub CreateDb(ByVal strTableName As String, ByVal dtSchema As DataTable)
  ' dtSchema is a schema from 
  ' dtSchema=somekindofdatareader.GetSchemaTable()
  ' You will need references to 
  ' Microsoft.SqlServer.ConnectionInfo
  ' Microsoft.SqlServer.Smo()
  ' Microsoft.SqlServer.SmoEnum()
  ' Microsoft.SqlServer.SqlEnum()
  Dim server As New Server(".\SQLEXPRESS") ' local pc SQLEXPRESS
  Dim db As Database = server.Databases("TestDataBase")
  ' Create new table
  Dim newTable As New Table(db, strTableName)
  Dim rw As DataRow
  Dim smoColumn As Column
  Dim nColumnSize As Integer
  Dim nColumnNumericPrecision As Decimal
  Dim nColumnNumericScale As Decimal
  Dim strIndexColumnName As String = ""
  For Each rw In dtSchema.Rows
   smoColumn = New Column(newTable, rw("ColumnName"))
   Select Case rw("DataType").ToString
    ' Handle datatype conversion - add the types you need
    Case "System.Int32"
     smoColumn.DataType = DataType.Int
    Case "System.String"
     nColumnSize = rw("ColumnSize")
     If nColumnSize = -1 Then
      smoColumn.DataType = DataType.VarCharMax
      smoColumn.DataType = DataType.VarChar(nColumnSize)
     End If
    Case "System.Decimal"
     nColumnNumericPrecision = rw("NumericPrecision")
     nColumnNumericScale = rw("NumericScale")
     smoColumn.DataType = DataType.Decimal(nColumnNumericScale, nColumnNumericPrecision)
    Case Else
     Err.Raise(555, , "Handle this type please")
   End Select
   smoColumn.Nullable = rw("AllowDBNull")
   ' Handle id-column
   If rw("IsAutoIncrement") And rw("IsUnique") Then
    strIndexColumnName = rw("ColumnName")
    smoColumn.Identity = True
    smoColumn.IdentitySeed = 1
    smoColumn.IdentityIncrement = 1
   End If
  If strIndexColumnName <> "" Then
   ' Create a PK Index
   Dim index As New Index(newTable, "PK_TestTable")
   index.IndexKeyType = IndexKeyType.DriPrimaryKey
   index.IndexedColumns.Add(New IndexedColumn(index, strIndexColumnName))
  End If
  ' Create the table in the database
 End Sub

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Author Comment

ID: 20793921
I should have stated that I was using VS 2003, however your post still helped me.

My original problem was with the following Line:
Select Case rw("DataType").ToString

The .ToString doesn't appear as an option for the datarow("ColumnName") in the tip that pops up, only .getType, however as your code showed it works anyway.


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