Can we use for loop in ref cursor?

Can we use for loop in ref cursor?

1 Answer. A ref cursor being a pointer to an open cursor used to send an open cursor as an out argument to the client app to loop through the record.

What is cursor FOR loop in Oracle?

The cursor FOR LOOP statement is an elegant extension of the numeric FOR LOOP statement. The numeric FOR LOOP executes the body of a loop once for every integer value in a specified range. Similarly, the cursor FOR LOOP executes the body of the loop once for each row returned by the query associated with the cursor.

How do I declare a ref cursor in Oracle?

First you have to create the “weak ref cursor type” and then you have to create “a cursor variable” using that ref cursor. When using SYS_REFCURSOR, you just have to create a cursor variable and nothing else. SYS_REFCURSOR completely minimizes the first step where you create the weak ref cursor type.

What is ref cursor in Oracle with example?

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.

What is difference between cursor and while loop?

Loop and cursor can be utilized in a circumstance to deal with row-based processing in T-SQL. 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.

How do I create a cursor in SQL?

To work with cursors you must use the following SQL statements: DECLARE CURSOR. OPEN. FETCH….Cursors in SQL procedures

1. Declare a cursor that defines a result set.
2. Open the cursor to establish the result set.
3. Fetch the data into local variables as needed from the cursor, one row at a time.
4. Close the cursor when done.

What does REF CURSOR mean in for loop?

A ref cursor being a pointer to an open cursor used to send an open cursor as an out argument to the client app to loop through the record.

Which is local to the Cursor FOR loop statement?

The record is the name of the index that the cursor FOR LOOP statement declares implicitly as a %ROWTYPE record variable of the type of the cursor. The record variable is local to the cursor FOR LOOP statement. It means that you can only reference it inside the loop, not outside.

How does SQL Cursor FOR loop work in Oracle?

Note that Oracle Database automatically optimizes a cursor FOR LOOP to work similarly to a BULK COLLECT query. Although your code looks as if it fetched one row at a time, Oracle Database fetches multiple rows at a time and allows you to process each row individually. PL/SQL cursor FOR LOOP examples

When does the cursor close in a loop in Java?

If there is no row to fetch, the cursor FOR LOOP closes the cursor. The cursor is also closed if a statement inside the loop transfers control outside the loop, e.g., EXIT and GOTO, or raises an exception. The following illustrates the syntax of the cursor FOR LOOP statement: