How do you see the output of a ref cursor?
This article demonstrates a few simple ways to display the contents of ref cursors.
- Test Function.
- SQL*Plus and SQLcl Variable.
- SQL*Plus and SQLcl Implicit Statement Results.
- Manual Approach Using PL/SQL.
- JSON Using APEX_JSON.
- XML Using XMLTYPE.
How do I return a ref cursor in Oracle?
With a cursor variable, you simply pass the reference to that cursor. To declare a cursor variable, you use the REF CURSOR is the data type. PL/SQL has two forms of REF CURSOR typeS: strong typed and weak typed REF CURSOR . The following shows an example of a strong REF CURSOR .
Can function return ref cursor?
Since Oracle 7.3 the REF CURSOR type has been available to allow recordsets to be returned from stored procedures and functions. Oracle 9i introduced the predefined SYS_REFCURSOR type, meaning we no longer have to define our own REF CURSOR types.
How do you call a procedure with Ref cursor out parameter?
Show activity on this post. create or replace procedure my_proc( p_rc OUT SYS_REFCURSOR ) as begin open p_rc for select 1 col1 from dual; end; / variable rc refcursor; exec my_proc( :rc ); print rc; will work in SQL*Plus or SQL Developer.
What is the difference between ref cursor and Sys_refcursor?
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 . type sys_refcursor is ref cursor; SYS_REFCURSOR was introduced in Oracle 9i.
Why ref cursor is used in PL SQL?
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.
What is the difference between cursor and ref cursor?
A cursor is really any SQL statement that runs DML (select, insert, update, delete) on your database. A ref cursor is a pointer to a result set. This is normally used to open a query on the database server, then leave it up to the client to fetch the result it needs.
How do you return a empty cursor from a stored procedure?
The only options you have are:
- open all the cursors in the procedure, using selects where 1=2 as necessary.
- catch and handle the invalid cursor error (-1001)
- Change the code structure completely so that you the client is only trying to get refcursors that will actually return data in the first place.
What is the difference between ref cursor and Sys Ref cursor in Oracle?
What is the difference between cursor and ref cursor in Oracle?
What is the advantage of ref cursor in Oracle?
A ref cursor is a variable, defined as a cursor type, which will point to, or reference a cursor result. The advantage that a ref cursor has over a plain cursor is that is can be passed as a variable to a procedure or a function. The ref cursor can be assigned to other ref cursor variables.
When should we use ref cursor in Oracle?
Using REF CURSOR s is one of the most powerful, flexible, and scalable ways to return query results from an Oracle Database to a client application. A REF CURSOR is a PL/SQL data type whose value is the memory address of a query work area on the database.
How to declare a weak REF CURSOR in Oracle 9i?
Starting from Oracle 9i, you can use SYS_REFCURSOR, which is a predefined weak typed REF CURSOR, to declare a weak REF CURSOR as follows: The following function gets all direct reports of a manager based on the manager id from the employees table in the sample database.
What is REF CURSOR type in PL/SQL?
PL/SQL has two forms of REF CURSOR typeS: strong typed and weak typed 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; Code language: SQL (Structured Query Language) (sql)
Why are cursor variables called strong typed REF CURSOR?
This form of cursor variable called strong typed REF CURSOR because the cursor variable is always associated with a specific record structure, or type. And here is an example of a weak typed REF CURSOR declaration that is not associated with any specific structure:
How do you use a cursor variable?
Without a cursor variable, you have to fetch all data from a cursor, store it in a variable e.g., a collection, and pass this variable as an argument. With a cursor variable, you simply pass the reference to that cursor.