What is SYS 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.
Do we need to close ref cursor in Oracle?
Best Answer RefCursor does not need to explicitly closed.
How do I print a ref cursor in Oracle 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.
How do you see the output of a ref cursor?
How can I fetch from a ref cursor that is returned from a stored procedure (OUT variable) and print the resulting rows to STDOUT in SQL*PLUS?…
- Create a test function to print its result.
- Execute the function.
- View the output.
- Verify the result set.
What is difference between cursor and for loop?
Unlike an implicit cursor, you can reference an explicit cursor or cursor variable by its name. Therefore, an explicit cursor or cursor variable is called a named cursor. The cursor FOR LOOP statement lets you run a SELECT statement and then immediately loop through the rows of the result set.
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.
What is difference between cursor and ref cursor in Oracle?
Which is better cursor or while loop?
Always confusing thing is which one is better; SQL While loop or cursor? While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets.
Can we use cursor in FOR LOOP with Oracle?
You can embed the SELECT directly inside the FOR loop. That’s easiest, but that also means you cannot reuse the SELECT in another FOR loop, if you have that need. You can also declare the cursor explicitly and then reference that in the FOR loop.