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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 SQLSelectTableJoin

        Public Enum Type
            Inner
            FullOuter
            LeftOuter
            RightOuter
        End Enum

        Private pobjParent As SQLSelectTableJoins
        Private pobjLeftTable As SQLSelectTable
        Private pobjRightTable As SQLSelectTable
        Private pobjConditions As SQLSelectTableJoinConditions
        Private peType As SQLSelectTableJoin.Type

        Friend Sub New(ByVal objParent As SQLSelectTableJoins)

            MyBase.New()
            pobjParent = objParent
            pobjConditions = New SQLSelectTableJoinConditions(Me)

        End Sub

        Property TheType() As SQLSelectTableJoin.Type
            Get

                Return peType

            End Get

            Set(ByVal Value As SQLSelectTableJoin.Type)

                peType = Value

            End Set
        End Property

        Public Property LeftTable() As SQLSelectTable
            Get
                LeftTable = pobjLeftTable
            End Get

            Set(ByVal Value As SQLSelectTable)

                If Value Is Nothing Then
                    Throw New ArgumentNullException
                End If

                pobjLeftTable = Value

            End Set
        End Property

        Public Property RightTable() As SQLSelectTable
            Get
                Return pobjRightTable
            End Get

            Set(ByVal Value As SQLSelectTable)

                If Value Is Nothing Then
                    Throw New ArgumentNullException
                End If

                pobjRightTable = Value

            End Set
        End Property

        Public Property Where() As SQLSelectTableJoinConditions
            Get
                Return pobjConditions
            End Get

            Set(ByVal Value As SQLSelectTableJoinConditions)
                pobjConditions = Value
            End Set
        End Property

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

                Dim strSQL As String
                Dim strJoin As String

                Select Case Me.TheType
                    Case SQLSelectTableJoin.Type.Inner
                        strJoin = "INNER JOIN"
                    Case SQLSelectTableJoin.Type.FullOuter
                        strJoin = "FULL OUTER JOIN"
                    Case SQLSelectTableJoin.Type.LeftOuter
                        strJoin = "LEFT OUTER JOIN"
                    Case SQLSelectTableJoin.Type.RightOuter
                        strJoin = "RIGHT OUTER JOIN"
                End Select

                If Index() = 0 Then
                    strSQL = pobjLeftTable.SQL(eConnectionType)
                Else
                    strSQL = pobjParent(Index() - 1).SQL(eConnectionType)
                End If

                strSQL &= " " & strJoin & " " & pobjRightTable.SQL(eConnectionType)

                If Not pobjConditions Is Nothing Then
                    If pobjConditions.SQL(eConnectionType) <> Nothing Then
                        strSQL &= " ON " & pobjConditions.SQL(eConnectionType)
                    End If
                End If

                'Surround the join with parentheses - MS Access won't accept it otherwise
                Return "(" & strSQL & ")"

            End Get
        End Property

        Private Function Index() As Integer

            For intIndex As Integer = 0 To pobjParent.Count - 1
                If pobjParent(intIndex) Is Me Then
                    Return intIndex
                End If
            Next

        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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