wdaprojects.vb

数据库学习的绝好例子简单的数据库经典入门

Public Class WDAProjects
    Inherits WDABase

#Region " Constructor and Destructor "
    Public Sub New(ByVal Company As String, ByVal Application As String)
        MyBase.New(Company, Application)
    End Sub

    Public Shadows Sub Dispose()
        MyBase.Dispose()
    End Sub
#End Region

#Region " Public Project Functions "
    Public Function GetProjects() As DataSet
        Try
            GetProjects = New DataSet
            MyBase.SQL = "ProjectsPackage.usp_SelectProjects"
            'Initialize the Command object
            MyBase.InitializeCommand()
            'Add a Parameter to the Parameters collection
            MyBase.AddParameter("results_cursor", _
                OracleClient.OracleType.Cursor, ParameterDirection.Output)
            'Fill the DataSet
            MyBase.FillDataSet(GetProjects, "Projects")
        Catch ExceptionErr As Exception
            Throw New System.Exception(ExceptionErr.Message, _
            ExceptionErr.InnerException)
        End Try
    End Function

    Public Function GetProject(ByVal ProjectID As Guid) As DataSet
        Try
            GetProject = New DataSet
            MyBase.SQL = "ProjectPackage.usp_SelectProject"
            'Initialize the Command object
            MyBase.InitializeCommand()
            'Add the Parameters to the Parameters collection
            MyBase.AddParameter("inProjectID", _
                OracleClient.OracleType.Char, 36, ProjectID.ToString)
            MyBase.AddParameter("results_cursor", _
                OracleClient.OracleType.Cursor, ParameterDirection.Output)
            'Fill the DataSet
            MyBase.FillDataSet(GetProject, "Project")
        Catch ExceptionErr As Exception
            Throw New System.Exception(ExceptionErr.Message, _
            ExceptionErr.InnerException)
        End Try
    End Function

    Public Function AddProject(ByVal Project As DataSet) As Boolean
        Try
            MyBase.SQL = "usp_InsertProject"
            'Initialize the Command object
            MyBase.InitializeCommand()
            'Add the Parameters to the Parameters collection
            MyBase.AddParameter("inProjectID", _
                OracleClient.OracleType.Char, 36, _
                Project.Tables("Project").Rows(0).Item("ProjectID").ToString)
            MyBase.AddParameter("inProjectName", _
                OracleClient.OracleType.VarChar, 50, _
                Project.Tables("Project").Rows(0).Item("ProjectName"))
            MyBase.AddParameter("inProjectDescription", _
                OracleClient.OracleType.Clob, _
                Project.Tables("Project").Rows(0).Item( _
                "ProjectDescription").ToString.Length, _
                Project.Tables("Project").Rows(0).Item("ProjectDescription"))
            MyBase.AddParameter("inSequenceNumber", _
                OracleClient.OracleType.Number, 1, _
                Project.Tables("Project").Rows(0).Item("SequenceNumber"))
            'Execute the stored procedure
            AddProject = ExecuteStoredProcedure
        Catch ExceptionErr As Exception
            Throw New System.Exception(ExceptionErr.Message, _
            ExceptionErr.InnerException)
        End Try
    End Function

    Public Function UpdateProject(ByVal Project As DataSet) As Boolean
        Try
            MyBase.SQL = "usp_UpdateProject"
            'Initialize the Command object
            MyBase.InitializeCommand()
            'Add the Parameters to the Parameters collection
            MyBase.AddParameter("inProjectName", _
                OracleClient.OracleType.VarChar, 50, _
                Project.Tables("Project").Rows(0).Item("ProjectName"))
            MyBase.AddParameter("inProjectDescription", _
                OracleClient.OracleType.Clob, _
                Project.Tables("Project").Rows(0).Item( _
                "ProjectDescription").ToString.Length, _
                Project.Tables("Project").Rows(0).Item("ProjectDescription"))
            MyBase.AddParameter("inSequenceNumber", _
                OracleClient.OracleType.Number, 1, _
                Project.Tables("Project").Rows(0).Item("SequenceNumber"))
            MyBase.AddParameter("inProjectID", _
                OracleClient.OracleType.Char, 36, _
                Project.Tables("Project").Rows(0).Item("ProjectID").ToString)
            'Execute the stored procedure
            UpdateProject = ExecuteStoredProcedure
        Catch ExceptionErr As Exception
            Throw New System.Exception(ExceptionErr.Message, _
            ExceptionErr.InnerException)
        End Try
    End Function

    Public Function DeleteProject(ByVal ProjectID As Guid) As Boolean
        Try
            MyBase.SQL = "usp_DeleteProject"
            'Initialize the Command object
            MyBase.InitializeCommand()
            'Add a Parameter to the Parameters collection
            MyBase.AddParameter("inProjectID", _
                OracleClient.OracleType.Char, 36, ProjectID.ToString)
            'Execute the stored procedure
            DeleteProject = ExecuteStoredProcedure
        Catch ExceptionErr As Exception
            Throw New System.Exception(ExceptionErr.Message, _
            ExceptionErr.InnerException)
        End Try
    End Function
#End Region
End Class