What is the difference between cursor and ref cursor in Oracle?

What is the difference between cursor and ref cursor in Oracle?

The ref cursor can be anything. Another difference is a ref cursor can be returned to a client. a plsql “cursor cursor” cannot be returned to a client. Another difference is a ref cursor can be passed from subroutine to subroutine — a cursor cannot be.

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 .

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.

What is the advantage of ref cursor in Oracle?

Answer: A ref cursor is a PL/SQL 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.

Can ref cursor be used for dynamic queries?

Answer: Here is an example script that performs dynamic SQL and returns the data as a ref cursor. The best on site “Oracle training classes” are just a phone call away!

How do I return a ref cursor in Oracle?

CREATE OR REPLACE FUNCTION TEST_CUR RETURN SYS_REFCURSOR AS VAR_REF SYS_REFCURSOR; BEGIN OPEN VAR_REF FOR SELECT * FROM DUAL; RETURN VAR_REF; END; In this case, Oracle will close the cursor as soon as it is out of scope.

How do I check my ref cursor count?

first_name%TYPE, p_last_name IN record_table. last_name%TYPE, p_resultCursor OUT sys_refcursor ) IS BEGIN OPEN p_resultCursor FOR SELECT count(*) from record_table WHERE first_name LIKE (p_first_name || ‘%’) OR last_name LIKE (p_last_name || ‘%’); END; PROCEDURE get_records( p_first_name IN record_table.

How do I run a ref cursor in Oracle?

Here is the generalized syntax for declaring Ref cursors in Oracle Database: DECLARE TYPE [cursor_variable_name] IS REF CURSOR [RETURN (return_type)]; Syntax can be modified and used depending on what type of Ref Cursors you want to use in your application.

How many rows can a cursor hold?

A cursor can be viewed as a pointer to one row in a set of rows. The cursor can only reference one row at a time, but can move to other rows of the result set as needed.

Can ref cursor be used with procedure out parameter?

The Oracle Database adapter provides support for strongly-typed and weakly-typed (SYS_REFCURSOR) REF CURSORs that can be passed to PL/SQL procedures and functions as IN, OUT, or IN OUT parameters.

How do you call a ref cursor in procedure?

Returning REF CURSORs from PL/SQL : Functions, Procedures …

Can function return ref cursor in Oracle?

Answers. Yes, functions can return refcursors.

What are the 4 cursor attributes?

Every explicit cursor and cursor variable has four attributes: %FOUND , %ISOPEN %NOTFOUND , and %ROWCOUNT . When appended to the cursor or cursor variable, these attributes return useful information about the execution of a data manipulation statement.

How do I see ref cursor results in SQL Developer?

Using the classic SQL*PLUS PRINT command to view the refcursor output will work in SQL Developer just like it would work in your command line tools. You execute your program, you create a local variable or 3 to ‘catch’ said output, and then you PRINT it.

What is ref cursor and its types?

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.

How do I display ref cursor in SQL Developer?

Steps to Print ref cursor Output in SQL Developer

1. Create a test function to print its result.
2. Execute the function.
3. View the output.
4. Verify the result set.

What are different types of cursor?

There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors. These are explained as following below.

How many records can a cursor hold in Oracle?

there is no limit (i’m aware of) to the number of rows a cursor can process. Obviously, if you try and process 50 million records from a cursor, your program won’t likely finish anytime soon.

Do we need to close ref cursor in Oracle?

Best Answer

RefCursor does not need to explicitly closed.

How do I declare a ref cursor in Oracle SQL Developer?

How many rows a cursor can hold in Oracle?

What is cursor and types?

Cursor is a Temporary Memory or Temporary Work Station. It is Allocated by Database Server at the Time of Performing DML(Data Manipulation Language) operations on Table by User. Cursors are used to store Database Tables. There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors.

How do I create a ref cursor in Oracle?

What are the four types of cursor?

SQL Server Different Types of Cursors

• Static Cursors. A static cursor populates the result set at the time of cursor creation and the query result is cached for the lifetime of the cursor.
• Dynamic Cursors.
• Forward Only Cursors.
• Keyset Driven Cursors.

What are different types of cursors in Oracle?

PL/SQL – Cursors

• Implicit Cursors. Implicit cursors are automatically created by Oracle whenever an SQL statement is executed, when there is no explicit cursor for the statement.
• Explicit Cursors.
• Declaring the Cursor.
• Opening the Cursor.
• Fetching the Cursor.
• Closing the Cursor.