What is ref cursor in Oracle 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.
How do I run 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 .
Is ref cursor return?
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 I display ref cursor 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.
Why collections are used in Oracle?
Storing elements in a collection can provide a number of advantages. For starters, collections can help to simplify code. If you need to process a number of items of a similar type, storing these items in a collection will allow you to loop through each element with ease, referencing each one by an index.
What is the use of cursor in Oracle?
To execute a multi-row query, Oracle opens an unnamed work area that stores processing information. A cursor lets you name the work area, access the information, and process the rows individually. For more information, see “Querying Data with PL/SQL”.
What is SYS ref cursor?
The data server supports the declaration of cursor variables of the SYS_REFCURSOR built-in data type, which can be associated with any result set. The SYS_REFCURSOR data type is known as a weakly-typed REF CURSOR type.
How to use REF CURSOR example?
Given that block of code – you see perhaps the most “salient” difference – no matter how many times you run that block – cursor C will always be select
How to call Oracle stored procedure which returns REF CURSOR?
Returning REF CURSORs from PL/SQL : Functions,Procedures and Implicit Statement Results
How to execute dynamic SQL into cursor in Oracle?
EXECUTE IMMEDIATE Statement. The EXECUTE IMMEDIATE statement is the means by which native dynamic SQL processes most dynamic SQL statements.
Implicit Cursor. Whenever any DML operations occur in the database,an implicit cursor is created that holds the rows affected,in that particular operation.