Asp #2
- 1. Introduction to ASPIntroduction to ASP (Day 2)(Day 2) JoniJoni ATL - Bina NusantaraATL - Bina Nusantara
- 2. Agenda • Database Processing using ADO in ASP
- 3. ADO - ActiveX Data Object • A high-level data access API to access any data source • Relational database: Access, MSSQL, Oracle and any ODBC compliant database • Non-relational: e.g. Microsoft Index Server, Active Directory Service • Dual-interface COM interface • Can be used in any scripting language (e.g. VBScript in ASP) and compiled language (e.g. in Delphi).
- 4. ADO - ActiveX Data Object • A high-level data access API to access any data source • Relational database: Access, MSSQL, Oracle and any ODBC compliant database • Non-relational: e.g. Microsoft Index Server, Active Directory Service • Dual-interface COM interface • Can be used in any scripting language (e.g. VBScript in ASP) and compiled language (e.g. in Delphi).
- 5. A Generic API... • ADO provides a generic API for data access. But the underlying data source may not support some properties / methods. • Check the documentation of ADO and the data provider.
- 6. Important ADO Objects • Connection • RecordSet • Command • How to report error
- 7. Making Connection Dim conn Dim ConnectionString ConnectionString = "DSN=Pubs;UID=sa;PWD=pwd;" Set conn = Server.CreateObject(“ADODB.Connection”) conn.Open ConnectionString ‘Now you can use conn to issue SQL command ‘... conn.Close Set conn = Nothing
- 8. Connection String (ODBC) "DSN=Pubs;UID=sa;PWD=pwd;”"DSN=Pubs;UID=sa;PWD=pwd;” “PROVIDER=MSDASQL; DRIVER={Microsoft Access Driver (*.mdb)};DBQ=C:NWind.mdb; UID=admin; PWD=;” “PROVIDER=MSDASQL; DRIVER={Microsoft Access Driver (*.mdb)};DBQ=C:NWind.mdb; UID=admin; PWD=;” “driver={SQL Server};server=srv; uid=sa;pwd=pwd;database=pubs” “driver={SQL Server};server=srv; uid=sa;pwd=pwd;database=pubs” Using DSN DSNless, to MS SQL server DSNless, to Access MDB DSNless connection is a bit faster DSNless connection is a bit faster
- 9. Connection String (OLE DB) “Provider=Microsoft.Jet.OLEDB.3.51; Data Source=c:inetpubwwwrootusers.mdb” “Provider=SQLOLEDB; Data Source=myMachine; Initial Catalog=pubs; User ID=sa; Password=pwd” OLE DB, to MS SQL server OLE DB, to Access MDB Direct OLE DB connection is faster than ODBC connection in both connection establishment and record retrieval. Direct OLE DB connection is faster than ODBC connection in both connection establishment and record retrieval.
- 10. Executing SQL You’ll need to use ADODB.Command ... •If your update statement is executed many times, you should consider using prepared command for efficiency. •If you call stored procedure with parameters, use ADODB.Parameter with ADODB.Command •If your update statement has BLOB objects, use Property.AddChunk You’ll need to use ADODB.Command ... •If your update statement is executed many times, you should consider using prepared command for efficiency. •If you call stored procedure with parameters, use ADODB.Parameter with ADODB.Command •If your update statement has BLOB objects, use Property.AddChunk ‘assume conn is a live connection strCommand = “UPDATE, INSERT or DELETE SQL” conn.Execute strCommand, nRecordsAffected
- 11. Retrieving Data using RecordSet ‘assume conn is a live connection strQuery = “select * from Employee” Set rs = Server.CreateObject(“ADODB.RecordSet”) rs.Open strQuery, conn, cursorType, lockType Do While Not rs.EOF ‘access the current record by rs(“fieldname”) ‘or rs(fieldnum) rs.MoveNext Loop rs.Close Set rs = Nothing cursorType and lockType are optional. The default values are adOpenForwardOnly and adLockReadOnly cursorType and lockType are optional. The default values are adOpenForwardOnly and adLockReadOnly
- 12. Retrieving Data using RecordSet ‘assume conn is a live connection conn.BeginTrans conn.Execute strCommand1 conn.Execute strCommand2 ‘... conn.CommitTrans ‘or conn.RollbackTrans
- 13. Demo