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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 SQLUpdate
        Inherits SQLStatement

        Private pobjFields As New SQLFieldValues
        Private pobjCopyFields As New SQLUpdateCopyFields
        Private pobjConditions As New SQLConditions
        Private pstrTableName As String

        Public Sub New()

        End Sub

        Public Sub New(ByVal strTableName As String)

            Me.TableName = strTableName

        End Sub

        Public Sub New(ByVal strTableName As String, ByVal objValue As SQLFieldValue, ByVal objWhere As SQLCondition)

            Me.TableName = strTableName
            Me.Fields.Add(objValue)
            Me.Where.Add(objWhere)

        End Sub

        Public Property TableName() As String
            Get

                Return pstrTableName

            End Get

            Set(ByVal Value As String)

                pstrTableName = Value

            End Set
        End Property

        Public Property Fields() As SQLFieldValues
            Get

                Return pobjFields

            End Get

            Set(ByVal Value As SQLFieldValues)

                If Value Is Nothing Then
                    Throw New ArgumentNullException
                End If

                pobjFields = Value

            End Set
        End Property

        Public Property CopyFields() As SQLUpdateCopyFields
            Get

                Return pobjCopyFields

            End Get

            Set(ByVal Value As SQLUpdateCopyFields)

                If Value Is Nothing Then
                    Throw New ArgumentNullException
                End If

                pobjCopyFields = Value

            End Set
        End Property

        Public Property Where() As SQLConditions
            Get

                Return pobjConditions

            End Get

            Set(ByVal Value As SQLConditions)

                pobjConditions = Value

            End Set
        End Property

        Public Overrides ReadOnly Property SQL() As String
            Get

                Dim strSQL As String
                Dim strFieldValues As String
                Dim strConditions As String

                If TableName.Trim = Nothing Then
                    Throw New DatabaseObjectsException("TableName property has not been set.")
                End If

                If pobjFields.Count = 0 And pobjCopyFields.Count = 0 Then
                    Throw New DatabaseObjectsException("Field values have not been set.")
                End If

                For intIndex As Integer = 0 To pobjFields.Count - 1
                    With pobjFields(intIndex)
                        'Check the field name has been set. Can't really check whether the value has been set or not.
                        If .Name = Nothing Then
                            Throw New DatabaseObjectsException("Field Name has not been set.")
                        End If

                        strFieldValues &= SQLConvertIdentifierName(.Name, Me.ConnectionType) & " = " & SQLConvertValue(.Value, Me.ConnectionType)
                    End With

                    If intIndex <> pobjFields.Count - 1 Then
                        strFieldValues &= ", "
                    End If
                Next

                If pobjFields.Count > 0 And pobjCopyFields.Count > 0 Then
                    strFieldValues &= ", "
                End If

                For intIndex As Integer = 0 To pobjCopyFields.Count - 1
                    With pobjCopyFields(intIndex)
                        strFieldValues &= SQLConvertIdentifierName(.DestinationFieldName, Me.ConnectionType) & " = " & SQLConvertIdentifierName(.SourceFieldName, Me.ConnectionType)
                    End With

                    If intIndex <> pobjCopyFields.Count - 1 Then
                        strFieldValues &= ", "
                    End If
                Next

                strSQL = _
                    "UPDATE " & SQLConvertIdentifierName(Me.TableName.Trim, Me.ConnectionType) & " " & _
                    "SET " & strFieldValues

                If Not pobjConditions Is Nothing Then
                    strConditions = pobjConditions.SQL(Me.ConnectionType)
                    If strConditions <> Nothing Then
                        strSQL &= " WHERE " & strConditions
                    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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Web03 | 2.8.141015.1 | Last Updated 31 Jan 2007
Article Copyright 2005 by Toby Wicks
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