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Object-Oriented database design with the DatabaseObjects library

, 31 Jan 2007
Demonstrates creating object-oriented database systems with the DatabaseObjects library.
databaseobjects_demo_net.zip
VB.NET
demo
source
Northwind
NorthwindDB
bin
Northwind.vbproj.user
AxInterop.SHDocVw.dll
DatabaseObjects.dll
Interop.SHDocVw.dll
Northwind.exe
NorthwindDatabase.dll
NorthwindDatabase.vbproj.user
Attributes
bin
Database
DatabaseObjects.vbproj.user
Misc
SQL
DatabaseObjects.dll
Data
mysql_northwind.zip
Documentation
DatabaseObjects.chm
databaseobjects_demo_vb6.zip
VB6
demo
regsvr32.exe
source
Northwind
Northwind.vbg
NorthwindDB
ControlAnchor.cls
frmMain.frm
frmMain.frx
frmOrder.frm
frmOrder.frx
frmProducts.frm
frmProducts.frx
frmProductSearch.frm
frmProductSearch.frx
frmProductSearchExtended.frm
frmProductSearchExtended.frx
frmSuppliers.frm
frmSuppliers.frx
Northwind.exe
northwind.RES
Northwind.vbp
Categories.cls
Category.cls
Data.bas
LateBoundObject.cls
NorthwindDatabase.cls
NorthwindDatabase.OBJ
NorthwindDB.dll
NorthwindDB.vbp
Order.cls
OrderDetail.cls
OrderDetails.cls
Orders.cls
Product.cls
Products.cls
ProductSearch.cls
Supplier.cls
Suppliers.cls
bin
Database.cls
DBO.vbp
GlobalDatabase.cls
GlobalDatabaseObjects.cls
IDatabaseObject.cls
IDatabaseObjects.cls
IGlobalDatabaseObjects.cls
ISQLStatement.cls
modMisc.bas
SQLAlterTable.cls
SQLAutoIncrementValue.cls
SQLCondition.cls
SQLConditionFieldCompare.cls
SQLConditionInSelect.cls
SQLConditions.cls
SQLConditionSelect.cls
SQLCreateIndex.cls
SQLCreateTable.cls
SQLDelete.cls
SQLDropIndex.cls
SQLDropTable.cls
SQLFieldValue.cls
SQLFieldValues.cls
SQLIndexExists.cls
SQLIndexField.cls
SQLIndexFields.cls
SQLInsert.cls
SQLSelect.cls
SQLSelectField.cls
SQLSelectFields.cls
SQLSelectGroupByField.cls
SQLSelectGroupByFields.cls
SQLSelectOrderByField.cls
SQLSelectOrderByFields.cls
SQLSelectTable.cls
SQLSelectTableJoin.cls
SQLSelectTableJoinCondition.cls
SQLSelectTableJoinConditions.cls
SQLSelectTableJoins.cls
SQLSelectTables.cls
SQLTableExists.cls
SQLTableField.cls
SQLTableFields.cls
SQLUpdate.cls
SQLUpdateCopyField.cls
SQLUpdateCopyFields.cls
DatabaseObjects_vb6.dll
mysql_northwind.zip
images
templates
databaseobjects_classdiagram.jpg
logo.jpg
databaseobjects_src_net.zip
DatabaseObjects.vbproj.user
DatabaseObjects.dll
databaseobjects_src_vb6.zip
Database.cls
DBO.vbp
GlobalDatabase.cls
GlobalDatabaseObjects.cls
IDatabaseObject.cls
IDatabaseObjects.cls
IGlobalDatabaseObjects.cls
ISQLStatement.cls
modMisc.bas
SQLAlterTable.cls
SQLAutoIncrementValue.cls
SQLCondition.cls
SQLConditionFieldCompare.cls
SQLConditionInSelect.cls
SQLConditions.cls
SQLConditionSelect.cls
SQLCreateIndex.cls
SQLCreateTable.cls
SQLDelete.cls
SQLDropIndex.cls
SQLDropTable.cls
SQLFieldValue.cls
SQLFieldValues.cls
SQLIndexExists.cls
SQLIndexField.cls
SQLIndexFields.cls
SQLInsert.cls
SQLSelect.cls
SQLSelectField.cls
SQLSelectFields.cls
SQLSelectGroupByField.cls
SQLSelectGroupByFields.cls
SQLSelectOrderByField.cls
SQLSelectOrderByFields.cls
SQLSelectTable.cls
SQLSelectTableJoin.cls
SQLSelectTableJoinCondition.cls
SQLSelectTableJoinConditions.cls
SQLSelectTableJoins.cls
SQLSelectTables.cls
SQLTableExists.cls
SQLTableField.cls
SQLTableFields.cls
SQLUpdate.cls
SQLUpdateCopyField.cls
SQLUpdateCopyFields.cls
DatabaseObjects_vb6.dll
' ___________________________________________________
'
'  � Hi-Integrity Systems 2007. All rights reserved.
'  www.hisystems.com.au - Toby Wicks
' ___________________________________________________
'

Option Strict On
Option Explicit On

Namespace SQL

    Public Class SQLSelectGroupByFields
        Implements IEnumerable

        Private pobjGroupByFields As ArrayList

        Public Sub New()
            MyBase.New()
            pobjGroupByFields = New ArrayList
        End Sub

        Public Function Add() As SQLSelectGroupByField

            Return Add("", Nothing)

        End Function

        Public Function Add( _
            ByVal strFieldName As String) As SQLSelectGroupByField

            Return Add(strFieldName, Nothing)

        End Function

        Public Function Add( _
            ByVal strFieldName As String, _
            ByVal objTable As SQLSelectTable) As SQLSelectGroupByField

            Dim objFieldOrder As SQLSelectGroupByField
            objFieldOrder = New SQLSelectGroupByField

            With objFieldOrder
                .Table = objTable
                .Name = strFieldName
            End With

            pobjGroupByFields.Add(objFieldOrder)

            Return objFieldOrder

        End Function

        Default Public ReadOnly Property Item(ByVal strFieldName As String) As SQLSelectGroupByField
            Get

                Return DirectCast(pobjGroupByFields.Item(FieldNameIndex(strFieldName)), SQLSelectGroupByField)

            End Get
        End Property

        Default Public ReadOnly Property Item(ByVal intIndex As Integer) As SQLSelectGroupByField
            Get

                Return DirectCast(pobjGroupByFields.Item(intIndex), SQLSelectGroupByField)

            End Get
        End Property

        Public ReadOnly Property Count() As Integer
            Get

                Return pobjGroupByFields.Count()

            End Get
        End Property

        Friend ReadOnly Property SQL(ByVal eConnectionType As Database.ConnectionType) As String
            Get

                Dim strSQL As String

                For intIndex As Integer = 0 To Me.Count - 1
                    strSQL &= Me.Item(intIndex).SQL(eConnectionType)
                    If intIndex <> Me.Count - 1 Then
                        strSQL &= ", "
                    End If
                Next

                Return strSQL

            End Get
        End Property

        Public Function Exists(ByVal strFieldName As String) As Boolean

            Return FieldNameIndex(strFieldName) >= 0

        End Function

        Public Sub Delete(ByRef objGroupByField As SQLSelectGroupByField)

            If Not pobjGroupByFields.Contains(objGroupByField) Then
                Throw New ObjectDoesNotExistException
            End If

            pobjGroupByFields.Remove(objGroupByField)
            objGroupByField = Nothing

        End Sub

        Private Function FieldNameIndex(ByVal strFieldName As String) As Integer

            Dim objGroupByField As SQLSelectGroupByField

            strFieldName = strFieldName.Trim()

            For intIndex As Integer = 0 To Me.Count - 1
                objGroupByField = DirectCast(pobjGroupByFields.Item(intIndex), SQLSelectGroupByField)
                If String.Compare(strFieldName, objGroupByField.Name, ignoreCase:=True) = 0 Then
                    Return intIndex
                End If
            Next

            Return -1

        End Function

        Private Function GetEnumerator() As System.Collections.IEnumerator Implements System.Collections.IEnumerable.GetEnumerator

            Return pobjGroupByFields.GetEnumerator

        End Function

    End Class

End Namespace

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About the Author

Toby Wicks

United States United States
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Article Copyright 2005 by Toby Wicks
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