3. OLE DB: The OLE database protocol
Allows a program to access information in any
type of data source, and it is the basis for ADO.
Data provider: databases, spreadsheets, etc.
ADO: ActiveX Data Objects
An Interface for OLE DB.
Allow programmers to use a standard set of
objects to refer to any OLE DB data source.
ODBC: Open Database Connectivity
A driver manager
Used for relational databases
5. Three types of data source names
User DSN: usable only by you and only on the
machine currently using.
System DSN: Any one using the machine can use.
File DSN: Can be copied and used by other
computers with the same driver installed.
6. Visual Data Manager
Data Environments
Data Views
Data Report Designer
Data Projects
7. Add-Ins/Visual Data Manager
Supports: Access, dBase, FoxPro, Paradox,
ODBC, Text files.
Creating new database
Managing existing database
Query Builder, Form Wizard
DAO
8. Project/More ActiveX Designer/Data
Environment
Data Environments are designed to be the
basis of design-time and run-time data
access. They make data available to any
forms and modules in your application.
9. Right Click Connection1
Click Properties to set up database connection
Click Add Command to choose record source.
Drag and drop fields from Command1 to
form. Text box properties:
Data Source: Data Environment1
Data Member: Command1 (Note: Data
environment can support many command
objects)
Data Field
12. View/Data View Window
An overview of the database objects you
have in a project, such as Data
Environments, connections, data links.
13. Project/Add Data Report
Features of Data Report Designer
Drag and Drop fields from the Data Environment
to report detail section. The DataMember and
DataField properties of the text box are
automatically set.
Drag and Drop the Command object (Must make
sure the DataSOurce and DataMember properties
of the DataReport are set properly).
15. VB projects come with built-in Data
Environments and Data Report Designer.
16. Three VB database objects:
DAO, RDO, ADO
Two ways to work with these objects:
VB Data controls, data-bound controls
Programming objects
17. Support the Jet database
DAO data control
Database property
RecordSource property: tables, queries, SQL
statement
RecordSet Type Property: Table, Dynaset,
Snapshot
Able to connect to data sources such as dBase,
text files, and Excel spreadsheet.
18. Project/Components/Microsoft ADO 6.0
Double Click ADO to insert ADO
Right Click and select ADODC Properties
General : Source of Connection
RecordSource:
1 – adCmdText: SQL statement
2 – adCmdTable: Table in the database
4 - adCmdStoredProc
19. BOF Action, EOF Action
Command TimeOut: Amount of time in
seconds the ADO control will allow for
commands to be executed on the server.
ConnectionString
CursorLocation: server site, client site
CursorType
MaxRecords: 0 means no limit.
RecordSource
20. Forward Only: Can only move forward
through the recordset (can only
MoveNext). Use the least amount of
system resources.
Static: Can navigate in both directions.
Unable to see changes made by other
users.
Keyset: Can see changes made by other
users (except insertions).
Dynamic: Use most of resources, and can
see all changes made by other users.
21. ReadOnly
Optimistic: Does not lock the file until
updates are actually applied.
BatchOptimistic: All changes be submitted
at one time.
Pessimistic: Lock the table the entire time
that the recordset is open.
22. Determines the access rights of the user.
Read
Write
ReadWrite
ShareDenyRead: Deny other from opening
connections with read permissions.
ShareDenyWrite
ShareExclusive
ShareDenyNone: Prevent others from opening
conections with any permissions.