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Introduction to ADO.Net and Visual Studio Database Tools

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Title: Visual Basic Database Access Author: cob Last modified by: David Created Date: 2/14/2001 11:47:53 PM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Introduction to ADO.Net and Visual Studio Database Tools


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
Ado.Net
Dataset
Data Consumer
Adapter
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
  • ODBC 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
  • Control Panel /Administrative Tools/DataSource(ODB
    C)
  • 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.SQLE
    XPRESS\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 tables 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 "ProviderMicrosoft.ACE.OLEDB.12.
    0Data SourceC\\SalesDB2007.accdb"
  • OleDbConnection objConn new OleDbConnection(strC
    onn)

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 controls 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 tables 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
  • 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.
  • Preview data
  • Code view
  • Form load event
  • Adapters 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 FormsDepartment/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 objects smart tag to choose Edit
    in Dataset Designer
  • With the designer, right click the parent table
    and choose Add/Relation
  • Change dataGrids 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
    Toolboxs 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 Adapters Fill method
    to load the dataset
  • OleDbDataAdapter1.Fill(DataSet11)
  • Note 1 No navigation capability
  • Note 2 View adapters properties and see the SQL
    commands.

39
Creating a Form with Bound Textboxes
  • Configure Adapter and generate dataset.
  • Select textboxs Data Bindings property
  • Text choose field from bindingSOurce object
  • In the Form Load event, use Adapters 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 objects property window to set
    its DataSource and Data Member properties to the
    dataset object and table object.
  • Set controls DataBinding property to the
    BindingSource object.

42
Use BindingSource Objects 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
Adapters Update method
private void button4_Click(object sender,
EventArgs e)
bindingSource1.EndEdit()
oleDbDataAdapter1.Update(dataSet2.CUSTOMER)

44
Binding ListBox
  • Example Bind Customer Tables 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 objects properties,
    methods. Ex. System.Data.OleDbDataAdapter

48
Unbound TextboxNavigate from Dataset to Table
from Table to Row and Field
textBox3.Text dataSet41.Tables"employee".Rows
listBox1.SelectedIndex1.ToString() textBox4.Te
xt dataSet41.Tables"employee".RowslistBox1.Se
lectedIndex"Salary".ToString()
49
Working with SQL Server Data Adapter
  • From the Data tab
  • Choose SQLDataAdapter
  • (If you dont 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 tables DataAdapter to generate a
    dataset then use the child tables DataAdapter
    to generate the child table into the same
    dataset.
  • Open datasets 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 buttons using parent tables
    BindingSource object.
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