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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 SQLCreateIndex
        Inherits SQLStatement

        Private pstrName As String
        Private pstrTableName As String
        Private pbIsUnique As Boolean
        Private pobjFields As SQLIndexFields = New SQLIndexFields

        Public Sub New()

        End Sub

        Public Sub New(ByVal strIndexName As String, ByVal strTableName As String, ByVal strFieldNames() As String)

            Me.Name = strIndexName
            Me.TableName = strTableName

            For Each strFieldName As String In strFieldNames
                Me.Fields.Add(strFieldName)
            Next

        End Sub

        Public Sub New(ByVal strIndexName As String, ByVal strTableName As String, ByVal strFieldNames() As String, ByVal bIsUnique As Boolean)

            Me.New(strIndexName, strTableName, strFieldNames)
            pbIsUnique = bIsUnique

        End Sub

        Public Property Name() As String
            Get

                Return pstrName

            End Get

            Set(ByVal Value As String)

                pstrName = Value.Trim

            End Set
        End Property

        Public Property TableName() As String
            Get

                Return pstrTableName

            End Get

            Set(ByVal Value As String)

                pstrTableName = Value.Trim

            End Set
        End Property

        Public Property IsUnique() As Boolean
            Get

                Return pbIsUnique

            End Get

            Set(ByVal Value As Boolean)

                pbIsUnique = Value

            End Set
        End Property

        Public ReadOnly Property Fields() As SQLIndexFields
            Get

                Return pobjFields

            End Get
        End Property

        Public Overrides ReadOnly Property SQL() As String
            Get

                Dim strSQL As String

                'Although the index name is optional with SQL Server it is not optional with MySQL
                If Me.Name = Nothing Then
                    Throw New DatabaseObjectsException("IndexName has not been set.")
                End If

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

                strSQL = _
                    "CREATE " & UniqueString() & "INDEX " & _
                    SQLConvertIdentifierName(Me.Name, Me.ConnectionType) & " ON " & _
                    SQLConvertIdentifierName(Me.TableName, Me.ConnectionType) & _
                    " (" & pobjFields.SQL(Me.ConnectionType) & ")"

                Return strSQL

            End Get
        End Property

        Private Function UniqueString() As String

            If pbIsUnique Then
                Return "UNIQUE "
            Else
                Return ""
            End If

        End Function

    End Class


    Public Class SQLIndexFields

        Private pcolFields As ArrayList = New ArrayList

        Friend Sub New()

        End Sub

        Public Function Add() As SQLIndexField

            Return Add("", OrderBy.Ascending)

        End Function

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

            Return Add(strFieldName, OrderBy.Ascending)

        End Function

        Public Function Add( _
            ByVal strFieldName As String, _
            ByVal eOrder As OrderBy) As SQLIndexField

            Dim objField As SQLIndexField = New SQLIndexField

            With objField
                .Name = strFieldName
                .Order = eOrder
            End With

            pcolFields.Add(objField)
            Add = objField

        End Function

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

                Const cstrSeperator As String = ", "

                Dim strSQL As String

                For Each objField As SQLIndexField In pcolFields
                    strSQL &= objField.SQL(eConnectionType) & cstrSeperator
                Next

                Return strSQL.Substring(0, strSQL.Length - cstrSeperator.Length)      'remove the last comma and space

            End Get
        End Property

    End Class



    Public Class SQLIndexField

        Private pstrName As String
        Private peOrder As OrderBy

        Friend Sub New()

        End Sub

        Public Property Name() As String
            Get

                Return pstrName

            End Get

            Set(ByVal Value As String)

                pstrName = Value.Trim

            End Set
        End Property

        Public Property Order() As OrderBy
            Get

                Return peOrder

            End Get

            Set(ByVal Value As OrderBy)

                peOrder = Value

            End Set
        End Property

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

                Return SQLConvertIdentifierName(Me.Name, eConnectionType) & OrderString()

            End Get
        End Property

        Private Function OrderString() As String

            If peOrder = OrderBy.Descending Then
                Return " DESC"
            Else
                Return ""
            End If

        End Function

    End Class

End Namespace

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About the Author

Toby Wicks

United States United States
No Biography provided

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Web03 | 2.8.140916.1 | Last Updated 31 Jan 2007
Article Copyright 2005 by Toby Wicks
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