CURSORS IN PLSQL HOW TO
In this tutorial, you’ve learned how to use PL/SQL Cursor to loop through a set of rows with all necessary steps that need to be done including DECLARE, OPEN, FETCH and CLOSE. Returns TRUEif the cursor cursor_nameis open Returns the number of records fetched from the cursor cursor_nameat the time we test %ROWCOUNT attribute Returns TRUEif record was not fetched successfully by cursor cursor_name Returns TRUEif record was fetched successfully by cursor cursor_name These are the main attributes of a PL/SQL cursor and their descriptions. Code language: SQL (Structured Query Language) ( sql ) PL/SQL Cursor Attributes fetch information from cursor into recordĭBMS_OUTPUT.PUT_LINE(r_partment_name || ' - ' ||
INNER JOIN departments d ON d.manager_id = e.employee_id Here is an example of declaring a cursor:ĭECLARE - declare a cursor CURSOR cur_chief IS SELECT first_name, This part is optional so you can omit it in the CURSOR declaration. Third, you can indicate a list of columns that you want to update after the FOR UPDATE OF.Second, you specify a valid SQL statement that returns a result set where the cursor points to.
The RETURN return_specification is also an optional part. Creating a SQL Server cursor is a consistent process, so once you learn the steps you are easily able to. These parameters allow you to pass arguments into the cursor. The parameter1, parameter2… are optional elements in the cursor declaration. It is important to note that cursor’s name is not a variable so you cannot use it as a variable such as assigning it to other cursor or using it in an expression. The name of the cursor can have up to 30 characters in length and follows the naming rules of identifiers in PL/SQL. First, you declare the name of the cursor cursor_nameafter the CURSOR keyword.] Code language: SQL (Structured Query Language) ( sql )