Types of Cursors in ADODB

[Jagdish Gada]

Hi, can anyone give me information about the Cursors in ADODB? I don't know anything about it. I am a student of BSC.I.T. and we don't have this in our syllabus. And one of my interview interviewer ask me about the cursors in ADODB and I kept silent. Can anyone give me details about it?

[opaper]

Hi friend, Basically we have four types of cursors in ADODB. Which are as follows:

1.static
2.dynamic
3.keyset
4.Forward only

You need to improve your knowledge with the help of different books which are in market or you can get pdf files from the internet and use those for reading.

[MindSpace]

Hi, there are four types of cursors are available in ADODB, which are as follows:

1.Dynamic Recordsets - This allows viewing the result of add, modify & delete by other users.
2.Keyset Recordsets - This is similar as Dynamic recordset but prevents looking the changes by the other users.
3.Static Recordsets - It provides the static copy of a set of records to find data or generate reports.
4.Forward-only - This improves performance. It behaves identical to a
static recordset and allows forward-only.

[Modifier]

Hi, In ADO there are 4 different cursor types defined:

• Dynamic cursor - Allows you to see additions, changes, and deletions by other users.
  
• Keyset cursor - Like a dynamic cursor, except that you cannot see additions by other users, and it prevents access to records that other users have deleted. Data updation can be visible.
  
• Static cursor - Provides a static copy of a recordset for you to use to find data or generate reports.
  
• Forward-only cursor - Allows you to only scroll forward through the Recordset. Additions, changes, or deletions by other users will not be visible.

You can set the cursor type with the help of CursorType property or by the CursorType parameter in the Open method.

[Praetor]

Hi, you want the details about the Types of Cursors in ADODB. You need to use the simple cursor that provides the required data access. You need to make choice of cursor type depending upon the use of result set. For just scrolling your data use a forward-only or static cursor. If you have a large result set and need to select just a few rows, use a keyset cursor. If you want to synchronize a result set with recent adds, changes, and deletes by all concurrent users, use a dynamic cursor.

Types of Cursors in ADODB:

• Forward-Only Cursors
• Static Cursors
• Keyset Cursors
• Dynamic Cursors

Syntax:

objRecordset.CursorType

Example:

<%
set connect=Server.CreateObject("ADODB.Connection")
connect.Provider="Microsoft.Jet.OLEDB.4.0"
connect.Open(Server.Mappath("northwind.mdb"))
set rst = Server.CreateObject("ADODB.recordset")
sql="SELECT * FROM office"
rst.CursorLocation = adUseClient
rst.CursorType = adOpenStatic
rst.LockType = adLockBatchOptimistic
rst.Open sql, connect
%>