How do you declare a ref cursor?

How do you declare a ref cursor?

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 .

What is reference cursor 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.

How do I display ref cursor output in PL SQL Developer?

Using the PRINT command in a SQL Worksheet 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 cursor declaration?

DECLARE CURSOR defines the attributes of a Transact-SQL server cursor, such as its scrolling behavior and the query used to build the result set on which the cursor operates. The OPEN statement populates the result set, and FETCH returns a row from the result set.

Which keyword is used to declare a cursor variable?

A cursor variable is like an explicit cursor that is not limited to one query. To create a cursor variable, either declare a variable of the predefined type SYS_REFCURSOR or define a REF CURSOR type and then declare a variable of that type. You cannot use a cursor variable in a cursor FOR LOOP statement.

What is 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.

What is the difference between cursor and ref cursor?

Is ref cursor return?

REF CURSOR types may be passed as parameters to or from stored procedures and functions. The return type of a function may also be a REF CURSOR type. This provides the capability to modularize the operations on a cursor into separate programs by passing a cursor variable between programs.

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.

What is weak ref cursor in Oracle?

When a Ref-Cursor is defined without a return type, it is called as a weakly typed dynamic Ref-Cursor. There is no dependency on its return structure, thus making it open to all SELECT statements independent of its structure.

Which keyword is used to declare cursor?

To create a cursor variable, either declare a variable of the predefined type SYS_REFCURSOR or define a REF CURSOR type and then declare a variable of that type. You cannot use a cursor variable in a cursor FOR LOOP statement.

Can we declare a cursor inside begin?

In general, yes you can, you just nest another execution block inside your current one…

How are ref cursors represented 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. REF CURSOR s are represented through the OracleRefCursor ODP.NET class. REF CURSOR s have the following characteristics: A…

Which is the best definition of a REF CURSOR?

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.

Are there different types of REF CURSOR in Oracle Database?

As we learnt in the introduction to the ref cursor that there are three types of PL/SQL ref cursor in Oracle Database. So far in this series we have covered the concepts of Strong as well as Weak ref cursor. The only type of cursor which still untouched is PL/SQL SYS_REFCURSOR in Oracle Database.

How to declare a cursor for a function?

Below is a function that uses this cursor. As we get more complicated, we can declare cursors with parameters. For example, you could define a cursor called c2 as below. The result set of this cursor is all course_numbers whose subject_id matches the subject_id passed to the cursor via the parameter.