Why ref cursor in oracle

Therefore, once a row is read from an OracleRefCursor object, that same row cannot be obtained again from it unless it is populated again from a query. All the OracleDataReader objects or DataSet objects created from the OracleRefCursor objects are active at the same time, and can be accessed in any order. However, data that is retrieved into a DataSet can be updated. NET application, you cannot pass it back to another stored procedure. Client; using System. If you have not previously saved the password, the Oracle Server Login opens and you can enter the password now.

If you have saved the password, then the connection expands immediately. Under the Parameter Details group on the right, enter these three parameters. Click Add before each parameter that you need to add. A Preview SQL window appears, containing code similar to the following. Note that this code has been abbreviated by removing most of the comments. The Parameter Details area appears, showing the employees in department This section demonstrates how to modify your Oracle Data Provider for.

Make a copy of Form3. In the Form1 window, enter the connection information, and click Connect. Description of the illustration procedure1. The primary advantage of the reference cursors over the static cursors is that they can be passed as IN, OUT and INOUT parameters between the different subroutines also as return types for the functions and the external calling environments.

We can also handle all the cursor attributes in Ref-Cursors just how the static explicit cursors do it. These indigenous characteristics of the reference cursor make them more popular and flexible over the static cursors. The dynamic cursors cannot be created permanently in the database, but can only be declared in the declaration section of anonymous blocks, subroutines or packages as REF CURSOR types.

Initially, when they are declared, they are not associated with any memory space, but can be associated with any number of context areas during run time. The prototype for defining a Ref-Cursor is shown below,. There are two types of Ref-Cursors based on whether they have a return type or not. They are,. Restrictions in the Reference Cursors. Privacy Policy. Password recovery. Recover your password. Friday, November 12, Get help.

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