Matakuliah
Tahun
Versi
: T0063/Pemrograman Visual
: 2005
: 1/0
Pertemuan 10
Pemrograman Database
1
Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
• Mendemonstrasikan penggunaan
database yang ditunjang oleh
pemrograman visual (C3)
2
Outline Materi
Pemrograman Database
• Database
• ADO
• Connection
• Connection String Argument
• State
• Command
• RecordSet
• Cursor Type
• Fields
• Connection in Action
• Command in Action
• RecordSet in Action
• Processing Data
• Query Data
• Modifying Data
3
Database
• Akses database
– ODBC
– DAO
– RDO
– ADO
4
ADO
• ActiveX Data Object (ADO)
– Generasi paling baru untuk mengakses data
– Terdiri :
• Consumer
• Service
• Data provider
5
ADO
ADO Object Model
• Connection
– Error
– Property
• Command
– Parameter
– Property
• Recordset
– Fields
– Property
6
Connection
Connection
•
Characteristics
– Mewakili satu session dengan data source
•
Properties
–
–
–
–
–
–
–
•
ConnectionString
Provider
ConnectionTimeOut (default 30 detik)
CommandTimeOut (default 30 detik)
CursorLocation (adUseClient atau adUseServer)
State
Errors
Events
– WillConnect, ConnectComplete, Disconnect
– WillExecute, ExecuteComplete,
•
Methods
– Open
– Execute
7
Connection String Argument
Argument
Description
Data Source
The name of the SQL Server or the name of the MDB database to which you want
to connect. When connecting to an ODBC source, this argument can also be
the name of a Data Source Name (DSN).
DSN
An ODBC source name registered on the current machine; this argument can
replace the Data Source argument.
Filename
A file that contains information about the connection; this argument can be an
ODBC DSN file or a Microsoft Data Link (UDL) file.
Initial Catalog
The name of the default database. When connecting to an ODBC source, you can
also use the Database argument.
Password
The user's password. When connecting to an ODBC source, you can use the
PWD argument. You don't need to pass your user ID and password if you're
connecting to SQL Server and you use integrated security.
Persist Security
Info
True if ADO stores the user ID and the password in the data link.
Provider
The name of the OLE DB provider; the default value is MSDASQL, the provider
for ODBC sources.
User ID
The user's name. When connecting to an ODBC source, you can use the UID
argument instead.
8
State
Value
Description
0-adStateClosed
The connection is closed.
1-adStateOpen
The connection is open.
2-adStateConnecting
The connection is being opened.
4-adStateExecuting
The connection is executing a command.
8-adStateFetching
A Recordset is being retrieved.
9
Command
Command
• Characteristics
– Berisi sintak SQL dan parameter untuk dieksekusi
• Properties
– CommandText
– ActiveConnection
– Parameters
• Events
– Tidak ada
• Methods
– Execute
– Cancel
10
RecordSet
RecordSet
• Characteristics
– Interface data
•
Properties
–
–
–
–
–
–
•
Events
–
–
–
–
–
•
Source
ActiveConnection
DataSource
Filter
CursorLocation (2-adUseServer atau 3-adUseClient )
CursorType
FetchProgress, FetchComplete
WillMove, MoveComplete
EndOfRecordset
WillChangeField, FieldChangeComplete
WillChangeRecord, RecordChangeComplete
Methods
– Open
11
Cursor Type
Value
Description
0-adOpenForwardOnly
Server side cursor, you can navigate a forwardonly Recordset only by using the MoveNext
method
1-adOpenKeyset
Keyset cursors are similar to dynamic cursors, but
they don't include records added by other users
2-adOpenDynamic
Dynamic cursors consist of a set of bookmarks to
the actual data in the data source,
automatically updated when other users add or
delete a record or change any record already in
the Recordset
3-adOpenStatic
Actually a copy of the data coming from the
database. Static cursors create a fully
scrollable snapshot of all the records
12
Fields
Fields
• Cara mengakses field :
– rs.Fields(Index).Value
– rs.Fields(“FieldName”).Value
– rs.!FieldName
13
Connection in Action
• Persiapan
– Database
– Reference
14
Connection in Action
• Connection
– Deklarasi object Connection
– Tentukan Data Provider
– Tentukan spesifikasi sumber data
– Open Connection
15
Connection in Action
Koneksi ke
Access
Koneksi ke
SQLServer
16
Command in Action
• Command
– Deklarasi object Command
– Hubungkan command dengan koneksi aktif
– Tentukan spesifikasi query data
– Jalankan command
17
Command in Action
18
RecordSet in Action
• RecordSet
– Deklarasi object recordset
– Jalankan command dan tampung ke dalam recordset
19
RecordSet in Action
Cara Lain Akses Data *
• Untuk mempersingkat perintah, biasanya Command jarang dipakai
• Execute dilakukan langsung oleh connection, tanpa melalui
command, dan ditampung oleh recordset
*Masih banyak cara lainnya, coba eksplor cara akses
data cukup menggunakan recordset saja
20
RecordSet in Action
• Bandingkan hasilnya dengan program
sebelumnya
21
Processing Data
• Struktur Navigasi Recordset
– BOF, penanda awal record
– EOF, penanda akhir record
– MoveFirst, kembali ke posisi awal
– MoveLast, maju ke posisi akhir
– MovePrevious, kembali ke posisi sebelumnya
– MoveNext, maju ke posisi sesudahnya
– RecordCount, mengetahui jumlah record
22
Query Data
• Loop
– Recordset berisi collection data, sehingga
untuk mengaksesnya diperlukan loop
Do
List1.AddItem rs.Fields(0).Value
rs.MoveNext
Loop Until rs.EOF
– atau
If rs.RecordCount <> 0 Then
rs.MoveFirst
Do
List1.AddItem rs.Fields(0).Value
rs.MoveNext
Loop Until rs.EOF
End If
23
Modifying Data
• Modifying Record
– Banyak record, menggunakan sintaks SQL
– Satu record, menggunakan recordset
• Sintaks SQL
– Select
– Insert
– Update
– Delete
SELECT * FROM table1 WHERE field=?
INSERT INTO table1 (field1, field2)
VALUES (newValue1, newValue2)
UPDATE table1 SET field=newValue
DELETE FROM table WHERE field1=?
24
Modifying Data
25
Modifying Data
Memodifikasi record tunggal
• AddNew
– Menambah record baru
rs.AddNew
rs!fname = "Nana"
rs!lname = “Sylva"
rs.Update
• Delete
– Menghapus record aktif
• Modify
– Memodifikasi record aktif
rsAuthors.Delete
rs!fname = “Nana"
rs!lname = “Sylva"
rs.Update
26
Modifying Data
• Contoh :
27