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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 SQLUnion
        Inherits SQLStatement

        Public Enum Type
            Distinct        'default
            All
        End Enum

        Private Const pceDefaultUnionType As SQLUnion.Type = Type.Distinct

        Private pobjSelectStatements As New ArrayList
        Private pobjUnionType As New ArrayList
        Private pobjOrderByFields As SQLSelectOrderByFields = New SQLSelectOrderByFields

        Public Sub New()

        End Sub

        Public Sub New(ByVal objSelect1 As SQLSelect, ByVal objSelect2 As SQLSelect)

            Me.New(objSelect1, pceDefaultUnionType, objSelect2)

        End Sub

        Public Sub New(ByVal objSelect1 As SQLSelect, ByVal eType As SQLUnion.Type, ByVal objSelect2 As SQLSelect)

            Add(objSelect1)
            AddUnionType(eType)
            Add(objSelect1)

        End Sub

        Public Sub Add(ByVal objSelect As SQLSelect)

            EnsurePreviousTypeExists()
            pobjSelectStatements.Add(objSelect)

        End Sub

        Public Sub AddUnionType(ByVal eType As SQLUnion.Type)

            If pobjUnionType.Count() + 1 > pobjSelectStatements.Count() Then
                Throw New DatabaseObjectsException("First call the Add function - this function has been called without a prior call to Add")
            End If

            pobjUnionType.Add(eType)

        End Sub

        Public Property OrderBy() As SQLSelectOrderByFields
            Get

                Return pobjOrderByFields

            End Get

            Set(ByVal Value As SQLSelectOrderByFields)

                pobjOrderByFields = Value

            End Set
        End Property

        Private Sub EnsurePreviousTypeExists()

            'Add the AND operator if an operator hasn't been called after the previous Add call
            If pobjUnionType.Count() < pobjSelectStatements.Count() Then
                Me.AddUnionType(pceDefaultUnionType)
            End If

        End Sub

        Public Overrides ReadOnly Property SQL() As String
            Get

                Dim strSQL As String
                Dim objSelect As SQLSelect
                Dim strOrderBy As String

                If pobjSelectStatements.Count = 0 Then
                    Throw New DatabaseObjectsException("The table has not been set.")
                End If

                For intIndex As Integer = 0 To pobjSelectStatements.Count() - 1
                    If intIndex > 0 Then
                        strSQL &= " UNION "
                        If DirectCast(pobjUnionType(intIndex - 1), SQLUnion.Type) = Type.All Then
                            strSQL &= "ALL "
                        End If
                    End If

                    objSelect = DirectCast(pobjSelectStatements(intIndex), SQLSelect)
                    objSelect.ConnectionType = Me.ConnectionType
                    strSQL &= "(" & objSelect.SQL & ")"
                Next

                If Not pobjOrderByFields Is Nothing Then
                    strOrderBy = pobjOrderByFields.SQL(Me.ConnectionType)
                    If strOrderBy <> Nothing Then
                        strSQL &= " ORDER BY " & strOrderBy
                    End If
                End If

                Return strSQL

            End Get
        End Property

    End Class

End Namespace

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About the Author

Toby Wicks

United States United States
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