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Data Access
The options in this section define how the data access components will be migrated.
This optional feature allows the VBUC to convert ADODB to ADO.NET by using the System.Data.Common libraries and some helpers.
- This option converts ADODB to ADO.NET by using helper classes, achieving very high automation levels.
- If the VB6 code is using data binding to grids, it is also recommended to convert all data grids to .NET components.
General Description:
This solution uses a set of helper objects to provide equivalent behavior in .NET and to encapsulate the ADO.NET machinery required to handle a set of data, more specifically, for the RecordSet object, which is very powerful and flexible in Visual Basic 6 and does not have a direct equivalent in .NET. This approach reduces the manual changes effort to achieve functional equivalence.
The usage of System.Data.Common libraries provide the application with the ability to interact with different Database Manager Systems (e.g. SQL Server, Oracle, MS Access, etc) through its ADO.NET 2.0 compliant providers with just minimal configuration effort.
Deployment Note:
This feature uses a .NET configuration file containing specific sections. An example file is created in the output path of the migration solution. This file should be added to the main executable assembly and configured according to your needs by selecting the proper provider factory.
Class | Maps To |
ADODB.RecordSet | UpgradeHelpers.DB.ADO.ADORecordSetHelper |
ADODB.Command | System.Data.Common.DbCommand |
ADODB.CommandTypeEnum | System.Data.CommandType |
ADODB.Connection | System.Data.Common.DbConnection |
ADODB.DataTypeEnum | System.Data.DbType |
ADODB.Field | System.Data.DataColumn |
ADODB.Fields | System.Data.DataColumnCollection |
ADODB.IsolationLevelEnum | System.Data.IsolationLevel |
ADODB.ObjectStateEnum | System.Data.ConnectionState |
ADODB.Parameter | System.Data.Common.DbParameter |
ADODB.ParameterDirectionEnum | System.Data.ParameterDirection |
ADODB.Parameters | System.Data.Common.DbParameterCollection |
ADODB.Stream | System.IO.StreamWriter |
ADODB.LockTypeEnum | UpgradeHelpers.DB.ADO.LockTypeEnum |
ADODB.CursorLocationEnum | UpgradeHelpers.DB.ADO.CursorLocationEnum |
ADODB.AffectEnum | UpgradeHelpers.DB.ADO.AffectEnum |
ADODB.EventStatusEnum | UpgradeHelpers.DB.ADO.Events.EventStatusEnum |
ADODB.EventReasonEnum | UpgradeHelpers.DB.ADO.Events.EventReasonEnum |
ADODB.PositionEnum | UpgradeHelpers.DB.ADO.PositionEnum |
MSAdodcLib.Adodc | UpgradeHelpers.DB.ADO.ADODataControlHelper |
MSAdodcLib.EOFActionEnum | UpgradeHelpers.DB.Controls.EOFActionEnum |
MSAdodcLib.BOFActionEnum | UpgradeHelpers.DB.Controls.BOFActionEnum |
This optional feature also includes the conversion of ADOR to ADO.NET.
Class | Maps To |
ADOR.RecordSet | UpgradeHelpers.DB.ADO.ADORecordSetHelper |
Original VB6 code:
Dim conConnection As New ADODB.Connection
Dim cmdCommand As New ADODB.Command
Dim rstRecordSet As New ADODB.Recordset
conConnection.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source= NWIND.MDB;Persist Security Info=False;"
conConnection.Open
rstRecordSet.Open "SELECT * FROM Customers", conConnection
If rstRecordSet.EOF = False Then
MsgBox rstRecordSet.Fields(0).Name & "=" & rstRecordSet.Fields(0)
Else
MsgBox "No records were returned using the query " & cmdCommand.CommandText
End If
C# code:
DbConnection conConnection = UpgradeHelpers.DB.AdoFactoryManager.GetFactory().CreateConnection();
DbCommand cmdCommand = UpgradeHelpers.DB.AdoFactoryManager.GetFactory().CreateCommand();
ADORecordSetHelper rstRecordSet = new ADORecordSetHelper("");
conConnection.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source= NWIND.MDB;Persist
Security Info=False;";
//UPGRADE_TODO: (7010) The connection string must be verified to fullfill the .NET data provider connection string requirements.
conConnection.Open();
rstRecordSet.Open("SELECT * FROM Customers", conConnection);
if (!rstRecordSet.EOF)
{
MessageBox.Show(rstRecordSet.GetField(0).FieldMetadata.ColumnName + "=" + Convert.ToString(rstRecordSet[0]), AssemblyHelper.GetTitle(System.Reflection.Assembly.GetExecutingAssembly()));
}
else
{
MessageBox.Show("No records were returned using the query " + cmdCommand.CommandText, AssemblyHelper.GetTitle(System.Reflection.Assembly.GetExecutingAssembly()));
}
VB.NET code:
Dim conConnection As DbConnection = UpgradeHelpers.DB.AdoFactoryManager.GetFactory().CreateConnection()
Dim cmdCommand As DbCommand = UpgradeHelpers.DB.AdoFactoryManager.GetFactory().CreateCommand()
Dim rstRecordSet As New ADORecordSetHelper("")
conConnection.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source= NWIND.MDB;Persist
Security Info=False;"
'UPGRADE_TODO: (7010) The connection string must be verified to fullfill the .NET data provider connection string requirements. '
conConnection.Open()
rstRecordSet.Open("SELECT * FROM Customers", conConnection)
If Not rstRecordSet.EOF Then
MessageBox.Show(rstRecordSet.GetField(0).FieldMetadata.ColumnName & "=" & rstRecordSet(0), My.Application.Info.Title)
Else
MessageBox.Show("No records were returned using the query " & cmdCommand.CommandText, My.Application.Info.Title)
End If
This optional feature allows the VBUC to Convert ADODB to plain ADO.NET by using the provider-specific System.Data.SqlClient libraries.
This approach converts ADODB to plain ADO.NET, but it might require several manual changes to achieve functional equivalence, especially if the application uses RecordSets extensively.
General Description:
This solution converts ADODB data access patterns to plain ADO.NET specifically to interact with a SQL Server database.
Class | Maps To |
ADOBD.Command | System.Data.SqlClient.SqlCommand |
ADOBD.Parameters | System.Data.SqlClient.SqlParameterCollection |
ADOBD.DataTypeEnum | System.Data.DbType |
ADOBD.ParameterDirectionEnum | System.Data.ParameterDirection |
ADOBD.Parameter | System.Data.SqlClient.SqlParameter |
ADOBD.RecordSet | System.Data.DataSet |
ADOBD.CommandTypeEnum | System.Data.CommandType |
ADOBD.Connection | System.Data.SqlClient.SqlConnection |
ADOBD.Error | System.Data.SqlClient.SqlError |
ADOBD.Errors | System.Data.SqlClient.SqlErrorCollection |
ADOBD.IsolationLevelEnum | System.Data.IsolationLevel |
ADOBD.ObjectStateEnum | System.Data.ConnectionState |
This optional feature also includes the conversion of ADOR to ADO.NET.
Class | Maps To |
ADOR.RecordSet | System.Data.DataSet |
Original VB6 code:
Dim conConnection As New ADODB.Connection
Dim cmdCommand As New ADODB.Command
Dim rstRecordSet As New ADODB.Recordset
conConnection.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source= NWIND.MDB;Persist Security Info=False;"
conConnection.Open
rstRecordSet.Open "SELECT * FROM Customers", conConnection
If rstRecordSet.EOF = False Then
MsgBox rstRecordSet.Fields(0).Name & "=" & rstRecordSet.Fields(0)
Else
MsgBox "No records were returned using the query " & cmdCommand.CommandText
End If
C# code:
SqlConnection conConnection = new SqlConnection();
SqlCommand cmdCommand = new SqlCommand();
DataSet rstRecordSet = new DataSet();
//UPGRADE_TODO: (7010) The connection string must be verified to fullfill the .NET data provider conecction string requirements.
conConnection.Open();
...
cmdCommand.CommandText = "SELECT * FROM Customers";
...
//UPGRADE_ISSUE: (2064) ADODB.LockTypeEnum property LockTypeEnum.adLockUnspecified was not upgraded.
//UPGRADE_ISSUE: (2064) ADODB.CursorTypeEnum property CursorTypeEnum.adOpenUnspecified was not upgraded.
//UPGRADE_ISSUE: (2064) ADODB.Recordset method rstRecordSet.Open was not upgraded.
UpgradeStubs.ADODB_Recordset.Open(rstRecordSet, null, null, UpgradeStubs.ADODB_CursorTypeEnum.getadOpenUnspecified(), UpgradeStubs.ADODB_LockTypeEnum.getadLockUnspecified(), -1);
if (rstRecordSet.Tables[0].Rows.Count != 0)
{
//UPGRADE_WARNING: (2077) Change the default 0 index in the Rows property with the correct one.
MessageBox.Show(Convert.ToString(rstRecordSet.Tables[0].Rows[0][0]), Application.ProductName);
}
else
{
MessageBox.Show("No records were returned using the query " + cmdCommand.CommandText, Application.ProductName);
}
VB.NET code:
Dim conConnection As New SqlConnection
Dim cmdCommand As New SqlCommand
Dim rstRecordSet As New DataSet
'UPGRADE_TODO: (7010) The connection string must be verified to fulfill the .NET data provider connection string requirements.'
conConnection.Open()
...
cmdCommand.CommandText = "SELECT * FROM Customers"
...
'UPGRADE_ISSUE: (2064) ADODB.Recordset method rstRecordSet.Open was not upgraded. '
UpgradeStubs.ADODB_Recordset.Open(rstRecordSet)
If Not (rstRecordSet.Tables(0).Rows.Count = 0) Then
'UPGRADE_WARNING: (2077) Change the default 0 index in the Rows property with the correct one.'
MessageBox.Show(rstRecordSet.Tables(0).Rows(0)(0), Application.ProductName)
Else
MessageBox.Show("No records were returned using the query " & cmdCommand.CommandText, Application.ProductName)
End If
This feature will take the legacy COM control and create an interoperability code wrapper to make it visible from the managed code. This means the control's functionality will remain the same since it will use the same binary, but the resulting application will depend on the legacy control.
Original VB6 code:
Dim conConnection As New ADODB.Connection
Dim cmdCommand As New ADODB.Command
Dim rstRecordSet As New ADODB.Recordset
conConnection.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source= NWIND.MDB;Persist Security Info=False;"
conConnection.Open
rstRecordSet.Open "SELECT * FROM Customers", conConnection
If rstRecordSet.EOF = False Then
MsgBox rstRecordSet.Fields(0).Name & "=" & rstRecordSet.Fields(0)
Else
MsgBox "No records were returned using the query " & cmdCommand.CommandText
End If
C# code:
ADODB.Connection conConnection = new ADODB.Connection();
ADODB.Command cmdCommand = new ADODB.Command();
ADODB.Recordset rstRecordSet = new ADODB.Recordset();
...
conConnection.Open("", "", "", -1);
cmdCommand.CommandText = "SELECT * FROM Customers";
...
rstRecordSet.Open(Type.Missing, Type.Missing, ADODB.CursorTypeEnum.adOpenUnspecified, ADODB.LockTypeEnum.adLockUnspecified, -1);
if (! rstRecordSet.EOF)
{
MessageBox.Show(rstRecordSet.Fields[0].Name + "=" + Convert.ToString(rstRecordSet.Fields[0].Value), Application.ProductName);
}
else
{
MessageBox.Show("No records were returned using the query " + cmdCommand.CommandText, Application.ProductName);
}
VB.NET code:
Dim conConnection As New ADODB.Connection
Dim cmdCommand As New ADODB.Command
Dim rstRecordSet As New ADODB.Recordset
...
conConnection.Open()
cmdCommand.CommandText = "SELECT * FROM Customers"
...
rstRecordSet.Open()
If Not rstRecordSet.EOF Then
MessageBox.Show(rstRecordSet.Fields(0).Name & "=" & rstRecordSet.Fields(0).Value, Application.ProductName)
Else
MessageBox.Show("No records were returned using the query " & cmdCommand.CommandText, Application.ProductName)
End If
This optional feature allows the VBUC to convert DAO to ADO.NET by using the System.Data.Common libraries and some helper classes.
- This option converts DAO to ADO.NET using helper classes, achieving high automation levels.
- If the VB6 code is using data binding to grids, it is also recommended to convert all data-bound grids to .NET components.
General Description:
This solution uses a set of helper objects to provide equivalent behavior in .NET and to encapsulate the ADO.NET machinery required to handle a set of data, more specifically, for the RecordSet object, which is very powerful and flexible in Visual Basic 6 and does not have a direct equivalent in .NET. This approach reduces the manual changes effort to achieve functional equivalence.
The usage of System.Data.Common libraries provide the application with the ability to interact with different Database Manager Systems (e.g. SQL Server, Oracle, MS Access, etc) through its ADO.NET 2.0 compliant providers with just minimal configuration efforts.
Deployment Note:
This feature uses a .NET configuration file containing specific sections. An example file is created in the output path of the migration solution. This file should be added to the main executable assembly and configured according to your needs by selecting the proper provider factory.
Class | Maps to |
DAO.Recordset | UpgradeHelpers.DB.DAO.DAORecordSetHelper |
DAO.Field | System.Data.DataColumn |
DAO.Fields | System.Data.DataColumnCollection |
DAO.Database | System.Data.Common.DBConnection |
DAO.ParameterDirectionEnum | System.Data.ParameterDirection |
DAO.Parameters | System.Data.Common.DbParameterCollection |
DAO.Parameter | System.Data.Common.DbParameter |
DAO.QueryDef | System.Data.Common.DbCommand |
DAO.Connection | System.Data.Common.DbConnection |
DAO.Workspace | UpgradeHelpers.DB.DAO.WorkspaceHelper |
DAO.DBEngine | UpgradeHelpers.DB.DAO.DBEngineHelper |
DAO.RecordsetTypeEnum | UpgradeHelpers.DB.DAO.DAORecordsetTypeEnum |
DAO.LockTypeEnum | UpgradeHelpers.DB.DAO.DAOLockTypeEnum |
DAO.RecordsetOptionEnum | UpgradeHelpers.DB.DAO.DAORecordsetOptionEnum |
Original VB6 code:
Dim ws As Workspace
Dim db As Database
Dim strConnection As String
Set ws = DBEngine.Workspaces(0)
strConnection = "ODBC;DSN=" & "DatabaseName" & ";UID=" & "UserName" & ";PWD=" & "UserPassword"
Set db = ws.OpenDatabase("", False, False, strConnection)
Dim rs As Recordset
Set rs = db.OpenRecordset("TableName")
If Not rs.EOF Then
MsgBox rs!IDField
End If
C# code:
WorkspaceHelper ws = DBEngineHelper.Instance(UpgradeHelpers.DB.AdoFactoryManager.GetFactory())[0];
string strConnection = "ODBC;DSN=" + "DatabaseName" + ";UID=" + "UserName" + ";PWD=" + "UserPassword";
//UPGRADE_WARNING: (2065) DAO.Workspace method ws.OpenDatabase has a new behavior.
DAODatabaseHelper db = ws.OpenDatabase("<Connection-String>");
DAORecordSetHelper rs = db.OpenRecordset("TableName");
if (! rs.EOF)
{
MessageBox.Show(Convert.ToString(rs["IDField"]), Application.ProductName);
}
VB.NET code:
Dim ws As WorkspaceHelper = DBEngineHelper.Instance(UpgradeHelpers.DB.AdoFactoryManager.GetFactory())(0)
Dim strConnection As String = "ODBC;DSN=" & "DatabaseName" & ";UID=" & "UserName" & ";PWD=" & "UserPassword"
'UPGRADE_WARNING: (2065) DAO.Workspace method ws.OpenDatabase has a new behavior.'
Dim db As DAODatabaseHelper = ws.OpenDatabase("<Connection-String>")
Dim rs As DAORecordSetHelper = db.OpenRecordset("TableName")
If Not rs.EOF Then
MessageBox.Show(rs("IDField"), Application.ProductName)
End If
This optional feature will take the legacy COM control and create an interoperability code wrapper to make it visible from the managed code. This means the control’s functionality will remain the same since it will use the same binary, but the resulting application will depend on the legacy control.
Original VB6 code:
Dim ws As Workspace
Dim db As Database
Dim strConnection As String
Set ws = DBEngine.Workspaces(0)
strConnection = "ODBC;DSN=" & "DatabaseName" & ";UID=" & "UserName" & ";PWD=" & "UserPassword"
Set db = ws.OpenDatabase("", False, False, strConnection)
Dim rs As Recordset
Set rs = db.OpenRecordset("TableName")
If Not rs.EOF Then
MsgBox rs!IDField
End If
C# code:
dao.Workspace ws = UpgradeSupport.DAO_DBEngine_definst.Workspaces[0];
string strConnection = "ODBC;DSN=" + "DatabaseName" + ";UID=" + "UserName" + ";PWD=" + "UserPassword";
dao.Database db = ws.OpenDatabase("", false, false, strConnection);
dao.Recordset rs = db.OpenRecordset("TableName", Type.Missing, Type.Missing, Type.Missing);
if (! rs.EOF)
{
MessageBox.Show(Convert.ToString(rs.Fields["IDField"].Value), Application.ProductName);
}
VB.NET code:
Dim ws As dao.Workspace = DAO_DBEngine_definst.Workspaces(0)
Dim strConnection As String = "ODBC;DSN=" & "DatabaseName" & ";UID=" & "UserName" & ";PWD=" & "UserPassword"
Dim db As dao.Database = ws.OpenDatabase("", False, False, strConnection)
Dim rs As dao.Recordset = db.OpenRecordset("TableName")
If Not rs.EOF Then
MessageBox.Show(rs.Fields("IDField").Value, Application.ProductName)
End If
Converts OracleInProcServer to ADO.NET by using the System.Data.Common libraries and some helpers.
- This option converts OracleInProcServer to ADO.NET by using helper classes but with a high automation level.
- If the VB6 code is using data binding to grids it is also recommended to convert all data grids to .Net components.
General Description:
This solution uses a set of helper objects to provide equivalent behavior in .NET and to encapsulate the ADO.NET machinery required in order to handle a set of data, more specifically for the RecordSet object, which is very powerful and flexible in VB6 and does not have a direct equivalence in .NET. The approach reduces the manual changes effort to achieve functional equivalence.
The usage of System.Data.Common libraries provide the application with the ability to interact with different Database Manager Systems (e.g. SQL Server, Oracle, MS Access, etc) through its ADO.NET 2.0 compliant providers with just a minimal configuration effort and proper dialect changes.
Deployment Note:
This feature needs to be configured using a .NET configuration file containing specific sections. An example file is created in the output path of the migration solution. This file should be added to the main executable assembly and configured according to your needs by selecting the proper provider factory.
Class | Maps to |
OracleInProcServer.OraSession / OracleInProcServer.OraSessionClass | System.Data.Common.DbConnection |
OracleInProcServer.OraDatabase | System.Data.Common.DbCommand |
OracleInProcServer.OraParameters | System.Data.Common.DbParameterCollection |
OracleInProcServer.OraDynaset | UpgradeHelpers.DB.ADO.ADORecordSetHelper |
OracleInProcServer.OraParameter | System.Data.Common.DbParameter |
OracleInProcServer.OraSqlStmt | UpgradeHelpers.DB.ADO.ADORecordSetHelper |
OracleInProcServer.OraField | UpgradeHelpers.DB.Essentials.FieldHelper |
OracleInProcServer.OraFields | UpgradeHelpers.DB.Essentials.FieldsHelper |
Original VB6 code:
Dim OraSession As OraSession
Dim OraDatabase As OraDatabase
Dim EmpDynaset As OraDynaset
'OraSession'
Set OraSession = New OraSessionClass
'OraDatabase'
Set OraDatabase = OraSession.OpenDatabase("Database", "username", 0&)
'OraDynaset'
Set EmpDynaset = OraDatabase.CreateDynaset("SELECT id, name FROM employee", 0&)
C# code:
//OraSession
DbConnection OraSession = UpgradeHelpers.DB.AdoFactoryManager.GetFactory().CreateConnection();
//OraDatabase
OraSession.ConnectionString = "Database" + "username";
OraSession.Open();
DbCommand TempCommand = UpgradeHelpers.DB.AdoFactoryManager.GetFactory().CreateCommand();
TempCommand.Connection = OraSession;
DbCommand OraDatabase = (DbCommand) TempCommand;
//OraDynaset
ADORecordSetHelper tempDynaset = new ADORecordSetHelper();
OraDatabase.CommandText = "SELECT id, name FROM employee";
OraDatabase.CommandType = CommandType.Text;
tempDynaset.Open(OraDatabase);
ADORecordSetHelper EmpDynaset = (ADORecordSetHelper) tempDynaset;
VB.NET code:
'OraSession'
Dim OraSession As DbConnection = UpgradeHelpers.DB.AdoFactoryManager.GetFactory().CreateConnection()
'OraDatabase'
OraSession.ConnectionString = "Database" & "username"
OraSession.Open()
Dim TempCommand As DbCommand = UpgradeHelpers.DB.AdoFactoryManager.GetFactory().CreateCommand()
TempCommand.Connection = OraSession
Dim OraDatabase As DbCommand = TempCommand
'OraDynaset'
Dim tempDynaset As New ADORecordSetHelper()
OraDatabase.CommandText = "SELECT id, name FROM employee"
OraDatabase.CommandType = CommandType.Text
tempDynaset.Open(OraDatabase)
Dim EmpDynaset As ADORecordSetHelper = tempDynaset
This optional feature will take the legacy COM control and create an interoperability code wrapper to make it visible from the managed code. This means the control’s functionality will remain the same since it will use the same binary, but the resulting application will depend on the legacy control.
Original VB6 code:
Dim OraSession As OraSession
Dim OraDatabase As OraDatabase
Dim EmpDynaset As OraDynaset
'OraSession'
Set OraSession = New OraSessionClass
'OraDatabase'
Set OraDatabase = OraSession.OpenDatabase("Database", "username", 0&)
'OraDynaset'
Set EmpDynaset = OraDatabase.CreateDynaset("SELECT id, name FROM employee", 0&)
C# code:
//OraSession
OracleInProcServer.OraSession OraSession = new OracleInProcServer.OraSessionClass();
//OraDatabase
OracleInProcServer.OraDatabase OraDatabase = (OracleInProcServer.OraDatabase) OraSession.get_OpenDatabase("Database", "username", 0);
//OraDynaset
object tempRefParam = Type.Missing;
OracleInProcServer.OraDynaset EmpDynaset = (OracleInProcServer.OraDynaset) OraDatabase.get_CreateDynaset("SELECT id, name FROM employee", 0, ref tempRefParam);
VB.NET code:
'OraSession'
Dim OraSession As OracleInProcServer.OraSession = New OracleInProcServer.OraSessionClass()
'OraDatabase'
Dim OraDatabase As OracleInProcServer.OraDatabase = OraSession.OpenDatabase("Database", "username", 0)
'OraDynaset'
Dim EmpDynaset As OracleInProcServer.OraDynaset = OraDatabase.CreateDynaset("SELECT id, name FROM employee", 0)
This optional feature allows the VBUC to convert RDO to plain ADO.NET by using the provider-specific System.Data.SqlClient libraries.
- This approach converts RDO to plain ADO.NET, but it might require several manual changes to achieve functional equivalence.
- Transformations to occurrences of MSRDC will also be applied when selecting this choice.
General Description:
This solution converts RDO data access patterns to plain ADO.NET specifically to interact with a SQL Server database.
This feature also supports the MSRDC data control.
Class | Maps to |
RDO.rdoConnection | System.Data.SqlClient.SqlConnection |
RDO.rdoResultset | System.Data.DataSet |
RDO.rdoColumns | The property “rdoColumns.item” is the only supported member of this class. |
RDO.rdoError | System.Data.SqlClient.SqlError |
RDO.Parameter | System.Data.SqlClient.SqlParameter |
RDO.Parameters | System.Data.SqlClient.SqlParameterCollection |
RDO.rdoPreparedStatement | System.Data.SqlClient.SqlCommand |
RDO.rdoQuery | System.Data.SqlClient.SqlCommand |
Original VB6 code:
Dim mobjRDOConn As rdoConnection
Dim mobjRDORst As rdoResultset
Dim mstrSQL As String
Set mobjRDOConn = rdoEngine.rdoEnvironments(0).OpenConnection ("PropDB", rdDriverNoPrompt, , "UID=admin;PWD=")
Set mobjRDORst = mobjRDOConn.OpenResultset(mstrSQL, rdOpenKeyset, rdConcurRowVer)
If Not mobjRDORst.EOF Then
MsgBox mobjRDORst("propno")
End If
C# code:
string mstrSQL = String.Empty;
//Connect to the Property database:
//UPGRADE_ISSUE: (2068) RDO.rdoEngine object was not upgraded.
//UPGRADE_ISSUE: (2064) RDO.rdoEngine method RDO.rdoEngine was not upgraded.
//UPGRADE_ISSUE: (2064) RDO.rdoEngine property rdoEngine.rdoEnvironments was not upgraded.
SqlConnection mobjRDOConn = (SqlConnection) rdoEngine.rdoEnvironments[0].OpenConnection("PropDB", RDO.PromptConstants.rdDriverNoPrompt, Type.Missing, "UID=admin;PWD=", Type.Missing);
SqlDataAdapter tempAdapter = new SqlDataAdapter(mstrSQL, mobjRDOConn);
DataSet mobjRDORst = new DataSet();
tempAdapter.Fill(mobjRDORst);
if (mobjRDORst.Tables[0].Rows.Count != 0)
{
//UPGRADE_WARNING: (2077) Change the default 0 index in the Rows property with the correct one.
MessageBox.Show(Convert.ToString(mobjRDORst.Tables[0].Rows[0]["propno"]), Application.ProductName);
}
VB.NET code:
Dim mstrSQL As String = ""
'UPGRADE_ISSUE: (2068) RDO.rdoEngine object was not upgraded. '
'UPGRADE_ISSUE: (2064) RDO.rdoEngine method RDO.rdoEngine was not upgraded. '
'UPGRADE_ISSUE: (2064) RDO.rdoEngine property rdoEngine.rdoEnvironments was not upgraded. '
Dim mobjRDOConn As SqlConnection = rdoEngine.rdoEnvironments(0).OpenConnection("PropDB", RDO.PromptConstants.rdDriverNoPrompt, , "UID=admin;PWD=")
Dim tempAdapter As SqlDataAdapter = New SqlDataAdapter(mstrSQL, mobjRDOConn)
Dim mobjRDORst As New DataSet
tempAdapter.Fill(mobjRDORst)
If Not (mobjRDORst.Tables(0).Rows.Count = 0) Then
'UPGRADE_WARNING: (2077) Change the default 0 index in the Rows property with the correct one.'
MessageBox.Show(mobjRDORst.Tables(0).Rows(0).Item("propno"), Application.ProductName)
End If
This optional feature allows the VBUC to convert RDO to ADO.NET by using the System.Data.Common libraries and some helpers.
- This option converts RDO to ADO.NET using helper classes, achieving a higher automation level.
- If the VB6 code is using data binding to grids, it is also recommended to convert all data-bound grids to .NET components.
- Transformations to occurrences of MSRDC will also be applied when selecting this choice.
General Description:
This solution uses a set of helper objects to provide equivalent behavior in .NET and to encapsulate the ADO.NET machinery required to handle a set of data, more specifically, for the RecordSet object, which is very powerful and flexible in Visual Basic 6 and does not have a direct equivalent in .NET. This approach reduces the manual changes effort to achieve functional equivalence.
The usage of System.Data.Common libraries provide the application with the ability to interact with different Database Manager Systems (e.g. SQL Server, Oracle, MS Access, etc) through its ADO.NET 2.0 compliant providers with just minimal configuration effort.
This feature also supports the MSRDC data control.
Deployment Note:
This feature uses a .NET configuration file containing specific sections. An example file is created in the output path of the migration solution. This file should be added to the main executable assembly and configured according to your needs by selecting the proper provider factory.
Class | Maps to |
RDO.rdoConnection | System.Data.Common.DbConnection |
RDO.rdoResultset | UpgradeHelpers.DB.RDO.RDORecordSetHelper |
RDO.rdoColumns | System.Data.DataColumnCollection |
RDO.rdoParameter | System.Data.Common.DbParameter |
RDO.rdoParameters | System.Data.Common.DbParameterCollection |
RDO.rdoPreparedStatement | System.Data.Common.DbCommand |
RDO.rdoQuery | System.Data.Common.DbCommand |
RDO.rdoEngine | UpgradeHelpers.DB.RDO.RDOEngineHelper |
RDO.rdoEnvironment | UpgradeHelpers.DB.RDO.RDOEnvironmentHelper |
RDO.rdoColumn | System.Data.DataColumn |
RDO.DataTypeConstants | System.Data.DbType |
RDO.LockTypeConstants | UpgradeHelpers.DB.RDO.LockTypeConstants |
RDO.QueryTypeConstants | System.Data.CommandType |
Original VB6 code:
Dim mobjRDOConn As rdoConnection
Dim mobjRDORst As rdoResultset
Dim mstrSQL As String
'Connect to the Property database:'
Set mobjRDOConn = rdoEngine.rdoEnvironments(0).OpenConnection ("PropDB", rdDriverNoPrompt, , "UID=admin;PWD=")
Set mobjRDORst = mobjRDOConn.OpenResultset(mstrSQL, rdOpenKeyset, rdConcurRowVer)
If Not mobjRDORst.EOF Then
MsgBox mobjRDORst("propno")
End If
C# code:
string mstrSQL = String.Empty;
//Connect to the Property database:
DbConnection mobjRDOConn = (DbConnection)RDOEngineHelper.Instance(UpgradeHelpers.DB.AdoFactoryManager.GetFactory()).Environments[0].OpenConnection("UID=admin;PWD=");
RDORecordSetHelper mobjRDORst = RDORecordSetHelper.Open(mstrSQL, mobjRDOConn, LockTypeConstants.rdConcurRowVer, "");
if (!mobjRDORst.EOF)
{
MessageBox.Show(Convert.ToString(mobjRDORst["propno"]), Application.ProductName);
}
VB.NET code:
Dim mstrSQL As String = ""
'Connect to the Property database:'
Dim mobjRDOConn As DbConnection = RDOEngineHelper.Instance(UpgradeHelpers.DB.AdoFactoryManager.GetFactory()).Environments(0).OpenConnection("UID=admin;PWD=")
Dim mobjRDORst As RDORecordSetHelper = RDORecordSetHelper.Open(mstrSQL, mobjRDOConn, LockTypeConstants.rdConcurRowVer, "")
If Not mobjRDORst.EOF Then
MessageBox.Show(mobjRDORst("propno"), Application.ProductName)
End If
This optional feature will take the legacy COM control and create an interoperability code wrapper to make it visible from the managed code. This means the control’s functionality will remain the same since it will use the same binary, but the resulting application will depend on the legacy control.
Original VB6 code:
Dim mobjRDOConn As rdoConnection
Dim mobjRDORst As rdoResultset
Dim mstrSQL As String
Set mobjRDOConn = rdoEngine.rdoEnvironments(0).OpenConnection ("PropDB", rdDriverNoPrompt, , "UID=admin;PWD=")
Set mobjRDORst = mobjRDOConn.OpenResultset(mstrSQL, rdOpenKeyset, rdConcurRowVer)
If Not mobjRDORst.EOF Then
MsgBox mobjRDORst("propno")
End If
C# code:
string mstrSQL = String.Empty;