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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

''' --------------------------------------------------------------------------------
''' <summary>
''' An IDatabaseObject object represents a single record in a database table. The 
''' Database class provides the facility for classes implementing IDatabaseObject to 
''' copy data to and from the associated database record. Rather than directly 
''' implementing IDatabaseObject inherit from DatabaseObject as the DatabaseObject 
''' class provides the basic "plumbing" code required by IDatabaseObjects.
''' </summary>
''' --------------------------------------------------------------------------------
''' 
Public Interface IDatabaseObject

    ''' --------------------------------------------------------------------------------
    ''' <summary>
    ''' Should return whether the object has been saved to the database. Generally, 
    ''' this is implemented using a private variable that stores the object's saved state.
    ''' If a new object is saved or an existing object is loaded then this property 
    ''' is automatically set to true by the library.
    ''' </summary>
    ''' --------------------------------------------------------------------------------
    ''' 
    Property IsSaved() As Boolean

    ''' --------------------------------------------------------------------------------
    ''' <summary>
    ''' Should return the distinct value that uniquely identifies this 
    ''' object in the database. If a new object is saved (which uses an auto increment 
    ''' field) or an existing object is loaded then this property is automatically 
    ''' set by the library.
    ''' Typically, this is the value of an identity or auto increment database field.
    ''' </summary>
    ''' --------------------------------------------------------------------------------
    ''' 
    Property DistinctValue() As Object

    ''' --------------------------------------------------------------------------------
    ''' <summary>
    ''' This subroutine should copy the database fields from objFields to the object's 
    ''' variables. objFields is populated with all of the fields from the associated record.
    ''' </summary>
    ''' 
    ''' <example> 
    ''' <code>
    ''' Protected Sub LoadFields(ByVal objFields As SQL.SQLFieldValues) Implements IDatabaseObject.LoadFields
    ''' 
    '''     pstrCode = objFields("ProductCode").Value
    '''     pstrDescription = objFields("ProductDescription").Value
    ''' 
    ''' End Sub
    ''' </code>
    ''' </example>
    ''' --------------------------------------------------------------------------------
    ''' 
    Sub LoadFields(ByVal objFields As SQL.SQLFieldValues)

    ''' --------------------------------------------------------------------------------
    ''' <summary>
    ''' Should return an SQLFieldValues object populated with the  
    ''' fields to be written to the database. The first argument of the SQLFieldValues.Add 
    ''' function is the database field name, the second is the field's value.
    ''' </summary>
    ''' 
    ''' <example> 
    ''' <code>
    ''' Protected Function SaveFields() As SQL.SQLFieldValues Implements IDatabaseObject.SaveFields
    ''' 
    '''     SaveFields = New SQL.SQLFieldValues
    '''     SaveFields.Add("ProductCode", pstrCode)
    '''     SaveFields.Add("ProductDescription", pstrDescription)
    ''' 
    ''' End Function
    ''' </code>
    ''' </example>
    ''' --------------------------------------------------------------------------------
    ''' 
    Function SaveFields() As SQL.SQLFieldValues

End Interface

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Toby Wicks

United States United States
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