The cursor for loop will terminate when all of the records in the cursor have been fetched. We can give the cursor name instead of range limit in the for loop statement so that the loop will work from the first record of the cursor to the last record of the cursor. The cursor for loop is an elegant and natural extension of the numeric for loop in plsql. The for loop loops for a specific number of times defined by for statement. Structure for traversing and processing results sequentially. If however you will stick to this crappy method, close the cursor after the loop. With a numeric for loop, the body of the loop executes once for. The cursor for loop implicitly creates its loop index as a record variable with the row type in which the cursor returns and then opens the cursor. The cursor for loop is one of my favorite plsql features. Cursor for loop in oracle database by manish sharma. Opening and fetching cursors manually is not the preferred way of doing this. The variable used as the counter for the for loop does not need to be declared in the declaration section of the code.
Oracle control structures loops for while cursor if then. Steven feuerstein is oracle corporations developer advocate for plsql, and an expert. Oracle cursors what a select for update cursor represent. For loop cursor in plsql oracle plsql tutorial videos. Using %rowtype with cursors plsql ibm knowledge center. The openfor statement executes the query associated with a cursor variable.
Using procedure or cursor to store a selectstatement. Oracle 19c plsql fundamentals provides a complete, handson, comprehensive introduction to plsql including the use of both sql developer and sql plus. You would use a cursor for loop when you want to fetch and process every record in a cursor. If there is no row to fetch, the cursor for loop closes the cursor. The syntax for the cursor for loop in oracle plsql is. The %rowtype attribute is prefixed by a cursor name or a cursor variable.
Cursor for loop allows us to simplify this procedure by letting plsql do most of the things for us. This oracle tutorial explains how to use the cursor for loop in oracle with syntax and examples. But theres a problem with using a cursor for loop for a singlerow fetch. It allocates database resources to process the query and identifies the result set the rows that meet the query conditions.
In sometime you require to use explicit cursor with for loop instead of use open, fetch, and close statement. In essence, a ref cursor is a pointer or a handle to a result set on the database. Description an exploration into the very useful and elegant cursor for loop, in which we declaratively tell the plsql engine i want to do x for. Plsql cursor for loop has one great advantage of loop continued until row not found. The cursor variable is positioned before the first row in the result set. Plsql cursor for loop statement by practical examples. Hi, shall we declare or define a cursor inside a for loop. All dml statements and cursor for loops, which affect multiple rows fall under the category of multiple row implicit cursors. Using ref cursors 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 plsql data type whose value is the memory address of a query work area on the database. Using plsql stored procedures and ref cursors oracle. You can simplify coding by using a cursor for loop instead of the open, fetch, and close statements. It doesnt sound like the optimal way of doing things, but unless you give us more details, were not going to be able to offer the best advice.
Different types of cursors in plsql oracle live sql. A cursor for loop implicitly declares its loop index as a record that represents a row fetched from the database. Introduction to oracle 11g cursors eye on databases. This tutorial introduces you the plsql cursor for loop statement and show you how to fetch and process every record from a cursor. Create procedure curdemo begin declare done int default false. Access out parameters of a procedure from another procedure in oracle.