What is a ref cursor in Oracle?
A REF CURSOR is a PL/SQL data type whose value is the memory address of a query work area on the database. In essence, a REF CURSOR is a pointer or a handle to a result set on the database. REF CURSOR s are represented through the OracleRefCursor ODP.NET class.
What is the difference between ref cursor and Sys Ref cursor in Oracle?
There is no difference between using a type declared as REF CURSOR and using SYS_REFCURSOR , because SYS_REFCURSOR is defined in the STANDARD package as a REF CURSOR in the same way that we declared the type ref_cursor .
How do I create a ref cursor?
The following shows an example of a strong REF CURSOR .
- DECLARE TYPE customer_t IS REF CURSOR RETURN customers%ROWTYPE; c_customer customer_t;
- DECLARE TYPE customer_t IS REF CURSOR; c_customer customer_t;
- DECLARE c_customer SYS_REFCURSOR;
What is Pragma Autonomous_transaction in Oracle?
The AUTONOMOUS_TRANSACTION pragma changes the way a subprogram works within a transaction. A subprogram marked with this pragma can do SQL operations and commit or roll back those operations, without committing or rolling back the data in the main transaction.
Can you have two stored functions with the same name?
No, you can’t. That means only packaged function/procedures can be overloaded, and we can’t create two stored functions with the same name as seperate objects in the database.
How do I get the REF CURSOR data type in Oracle?
A REF CURSOR data type can be obtained as an OracleDataReader object by calling the ExecuteReader method of the OracleCommand object. The output parameter with the OracleDbType property set is bound to OracleDbType.RefCursor. None of the output parameters of type OracleDbType.RefCursor is populated after the ExecuteReader method is invoked.
What is an oraclerefcursor object?
The OracleRefCursor object is a corresponding ODP.NET type for the REF CURSOR type. This section discusses the following aspects of using the REF CURSOR data type and OracleRefCursor objects:
Which data table is populated for the null REF CURSOR?
No DataTable is populated for the NULL REF CURSOR . When the ExecuteNonQuery method is invoked on a command that returns one or more REF CURSOR data types, each of the OracleCommand parameters that are bound as an OracleDbType.RefCursor gets a reference to an OracleRefCursor object.
What is the REF CURSOR function in a stored procedure?
This feature is useful in scenarios where a stored procedure or a function returns a REF CURSOR type to the .NET application, and based on the application logic, the application passes this REF CURSOR to another stored procedure for processing.