1. Introduction to ADO.Net and Visual Studio Database Tools
ISYS 512

2. Database Processing Querying database Updating database:
Insertion, deletion, modification

3. Steps to Retrieve Data Establishes a connection to the database.
Executes query commands against the database.
SQL Select commands
Process the returned data.

4. Steps to Update Data Establishes a connection to the database.
Executes update commands against the database.
SQL Insert, Delete, Update commands
Receive confirmation of completion.

5. ADO.Net: Connected and Disconnected Data Processing
The ADO.Net environment can be categorized into connected and disconnected environments.
A connected environment requires a constant connection to transfer data between the client application and the data source.
A disconnected environment retrieves data and performs modification without a constant connection to the data source.

6. ADO.Net Classes

7. ADO.Net Classes and Data Consumer
Adapter
Dataset
Data Consumer
WinForm
Connection
Command
WebForm
DataReader

8. ADO.NET Objects
Connection Object: Represent a connection to the database.
Command Object: The command object allows us to execute a SQL statement or a stored procedure.
DataReader: It is a read-only and forward-only pointer into a table to retrieve records.
DataSet Object: A DataSet object can hold several tables and relationships between tables.
DataAdapter: This the object used to pass data between the database and the dataset.

9. Data Providers Etc. ODBC Provider OLE DB Provider SQL Server Provider
Open Database Connectivity
A driver manager
Used for relational databases
OLE DB Provider
OLE DB interfaces provide applications with uniform access to data stored in diverse information sources, or data stores.
MS Access (accdb)
SQL Server Provider
Oracle Provider
Etc.

10. Using ODBC Windows 7: Three types of data source names, DSN
Control Panel /Administrative Tools/DataSource(ODBC)
Three types of data source names, DSN
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.
Note: For 32 bit software, you have to open the ODBC panel from C:\Windows\SysWOW64\odbcad32.exe

11. Define an ODBC DSN for Access Database
Download: SalesDB2011.accdb
Open ODBC Window
Define a System DSN to SalesDB2011 and name it: MySalesData

12. SQL Server Express/ SQL Server Express LocalDB
SQL Server Express is available free from Microsoft, but it requires more computer resources.
SQL Server Express LocalDB is a light-weight version of SQL Server Express that is already installed with VS 2012, and it does not bring heavy workload on development machines

13. VS Database Tools View/Server Explorer:
For connection to ODBC data sources, OleDB to MS Access, and SQL Server Express
View/SQL Server Object Explorer
For connection to SQL Server LocalDB

14. Connect to Access Database using OLE DB
From Server Explorer, right-click Add Connection:
Microsoft Access Database File (OLE DB)
Browse for database
Test Connection
Tools/Connect to database

15. Connect to Access Database using ODBC
From Server Explorer:
right-click Add Connection
Click Change
Microsoft Access ODBC Data source
Select DSN from the dropdown list
Test Connection

16. To Start SQL Server Express LocalDB
View/SQL Server Object Explorer
Point to SQL Server and Right-click:
Add SQL Server
Connect to Server
Serve name: (localdb)\v11.0
Connect

17. Lab: Creating a LocalDB Database
Database Name: MyDept
Tables:
Department:
DID, Dname, Office
Employee
EID, Ename, Sex, Salary, HireDate, DID

18. To Add a New Database Open the LocalDB node Right-click Databases
Add new database
Enter database name
Example: MyDept

19. To Add a New Table: Department
Open the Database node: Open the MyDept node
Right-click Tables and select: Add New Table
Change the table name to Department
CREATE TABLE [dbo].[Department]
Click Update; then click Update Database

20. To Add Records Open the Tables node
Right-click the table name (Department) and select View Data

21. To Modify Table Design Point and right-click the table name:
Select: View/Designer
Change the CREATE TABLE command
Or Change the design with the designer

22. Add Employee Table Right-click Tables and select Add Table:
EID, Ename, Sex, Salary, HireDate, DID

23. Working with SQL Server Express
Starting SQL Server:
Control Panel/Administrative Tools /Services/SQLServer(SQLExpress)
SQL Server database file extension: mdf
Default database folder:
A SQL Server file: testSQLServer.mdf
C:\Program Files\Microsoft SQL Server\MSSQL10.SQLEXPRESS\MSSQL\DATA\testSQLServer.mdf

24. Creating SQL Server Database
From Server Explorer, right click data connection and choose:
Create new SQL Server Database
Server name:
LocalServerName\SQLExpress
Ex: David-PC\SQLExpress
Add new table: Right click Tables and choose Add New Table
Define table’s fields
Add rows: Right click the table name and choose Show table data.

25. Create a New SQL Server Database: EmployeeDB
Add a new table: EmployeeTable
EID Char 10
Ename Char 30
Sex Char 1
Salary Numeric (10,2)
HireDate Date
Enter data

26. Three Ways to Create ADO.Net Objects
1. Automatically generated when creating data bound form.
Form wizard
2. Using Data Adapter Wizard
3. Using code:
Example:
string strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\SalesDB2007.accdb";
OleDbConnection objConn = new OleDbConnection(strConn);

27. Data Binding
Connect a control or property to one or more data elements.
Simple binding: Use simple binding to display a field value in controls that show Data Bindings in the property window, such as text box or label.
Complex binding: Use complex binding to bind more than one field to controls such as DataGrid and list box. Use the control’s Data Source and Data Member to bind the data.

28. Automatically Generating Data Bound Form
Creating a form with ADO.Net objects and data-bound controls to display and update information in a dataset.
Step 1: Add a new data source:
Step 2: Select controls for table fields:
Click the dropdown list next to the table’s name:
Datagrid view
Details
Step 3: Drag the table to form.

29. Add Data Source Data Source window: View/Other windows/Data Source
Add New Data Source
From Dataset
Select connection
Select tables

30. Data Bound Form Examples
Using the LocalDB database MyDept, show records of the Employee table:
with dataGridView
with detail view

31. Items Added to the Form Table Adapter: click smart tag Dataset:
Add query
Preview data
Dataset:
Edit in dataset designer
Binding Source: It is an object that keeps track of position (the current row) of a data source.
Code view:
Form load event:
Adapter’s Fill command

32. Other Data Form Demos DataGrid View Add /Modify/Delete records.
Read only form:
Delete AddNew, Delete, Save buttons from navigator bar.

33. Hierarchical Forms: Department/Employees
Parent table/Child table
Add parent table and child table to Data Source
Drag the parent table and the child table to the form. Parent table uses detail view and child table uses dataGrid view
Click Dataset object’s smart tag to choose Edit in Dataset Designer
With the designer, right click the parent table and choose Add/Relation
Change dataGrid’s DataSource property to the relation.

34. Detail Form with Bound ListBox
Example: Employee table form with EID listbox and displays selected employee information in textboxes.
Choose detail view for the Employee table.
Click the dropdown list next to the EID field and click ListBox
Drag the Employee table to the form.
Bind the EID field to the BindingSource:
Activate the Property window and click the listbox
Set the DataSOurce property to BindingSource
Set the Display Member property to EID

35. Creating A Database Application Without Programming
Creating a database application to display information and update database.
A main form with buttons to open data forms:
DisplayInfo
Enter New
Modify
Exit

36. Demo: Add Data Source from OleDB and ODBC Data source

37. Data Adapter Wizard – 2nd Level of Using ADO.Net
Configure Data Adapter and generating a dataset:
From the Data tab of the ToolBox, Drag OledbDataAdapter to the form.
Use the Data Adapter Wizard to configure the Adapter.
Right Click the Adapter to preview data and create dataset.
Note: If OledbDataAdapter is not listed in Toolbox’s Data tab , right click ToolBox Data Tab and select Choose Item; then select OleDbDataAdapter from .Net Framework components.

38. Creating a Form with Bound DataGridView
Configure Adapter and generate dataset.
Bind DataGridView control to the table:
Data Source property:
DataSet
Data Member property
A table in the dataset
In the Form Load event, use Adapter’s Fill method to load the dataset:
OleDbDataAdapter1.Fill(DataSet11);
Note 1: No navigation capability
Note 2: View adapter’s properties and see the SQL commands.

39. Creating a Form with Bound Textboxes
Configure Adapter and generate dataset.
Select textbox’s Data Bindings property:
Text: choose field from bindingSOurce object
In the Form Load event, use Adapter’s Fill method to load the dataset:
OleDbDataAdapter1.Fill(DataSet11)
Note: No navigation capability

40. Using BindingSource Object to Do the Binding and Navigation
It is an object that keeps track of position (the current row) of a data source.
Useful properties:
DataSource
DataMember
Position property: is the index of the current row. The index is a 0-based index, the first record has a position of 0.
Methods:
MoveFirst, MoveLast, MoveNext, MovePrevious
AddNew
AllowEdit
EndEdit
Current
RemoveCurrent

41. Bind Controls to BindingSource Object
Configure Adapter and generate dataset.
Add BindingSource object to the form
Use BindingSource object’s property window to set its DataSource and Data Member properties to the dataset object and table object.
Set control’s DataBinding property to the BindingSource object.

42. Use BindingSource Object’s MoveNext, MovePrevious Methods
Add a MoveNext button
bindingSource1.MoveNext();
Add a MovePrevious button:
bindingSource1.MovePrevious();

43. Adding AddNew and Save Button
AddNew button: Use BindingSource AddNew Method:
private void button3_Click(object sender, EventArgs e) {
bindingSource1.AddNew(); }
Save button: Use BindingSource EndEdit method and Adapter’s Update method:
private void button4_Click(object sender, EventArgs e) {
bindingSource1.EndEdit();
oleDbDataAdapter1.Update(dataSet2.CUSTOMER); }

44. Binding ListBox Example: Bind Customer Table’s CID field to a listbox.
Create a Adapter for Customer table , and generate the dataset.
Add ListBox and set binding properties:
Data Source: Customer table
Display Member: Field to display in the listbox.
Value Member: the actual values for items in the list box.

45. Display Selected Record
Bound textbox (same data source as the listbox):
If the Listbox and the textbox are bound to the same BindingSource object, the textbox will automatically displays the record of the selected listbox item.
Unbound textbox
To display the ValueMember
textBox3.Text = listBox1.SelectedValue.ToString();
To display other fields:
VB with late binding
Textbox1.text = ListBox1.SelectedItem(“Cname”)
C# does not support late binding:
No!

46. ListBox SelectedItem Property: (Works for VB)
How to display the selected record in unbound textbox?
After binding to a data source, this property return a DataRowView object.
What is DataRowView?
Object Browser:
System.Data
DataRowView: Item property is the default property
To retrieve a column from a DataRowView object (use 0-based index to identity a column):
ListBox1.SelectedItem.Item(1)
Or: ListBox1.SelectedItem(1)
Or: ListBox1.SelectedItem(“Cname”)

47. Using Object Browser View/Object Browser DataSet object model:
System.Data
DataSet
Relations
Tables
Rows
Columns
Use Object Browser to study object’s properties, methods. Ex. System.Data.OleDbDataAdapter

48. Unbound Textbox: Navigate from Dataset to Table; from Table to Row and Field
textBox3.Text = dataSet41.Tables["employee"].Rows[listBox1.SelectedIndex][1].ToString();
textBox4.Text = dataSet41.Tables["employee"].Rows[listBox1.SelectedIndex]["Salary"].ToString();

49. Working with SQL Server Data Adapter
From the Data tab:
Choose: SQLDataAdapter
(If you don’t see it, right-click the Data tab and select Choose Item. Then select it from the .Net components)

50. DataSet and Data Adapter
DataSet Object: A DataSet object can hold several tables and relationships between tables.
DataAdapter: This the object used to pass data between the database and the dataset.
It is an object with SQL Select, Insert, Update and Delete commands.

51. Creating Parent/Child Form Using DataAdapter Wizard
Add two DataAdapters to the form: one for the parent table and one for the child table.
Use the parent table’s DataAdapter to generate a dataset; then use the child table’s DataAdapter to generate the child table into the same dataset.
Open dataset’s designer and right-click the parent table and choose Add/Relation to add a relation.
Add and bind textboxes to the parent table; add dataGridView and bind its datasource property to the relation.
Add navigation button’s using parent table’s BindingSource object.