How to update records without invalidating cursor oracle

Posted by / 10-Dec-2019 22:19

How to update records without invalidating cursor oracle

This occurs when a malicious user “injects,” or inserts into the statement, code that changes the behavior of that SQL statement.

For advice on avoiding SQL injection–based security breaches, check out “How to Write SQL Injection Proof PL/SQL".

Best of all, Oracle Database automatically optimizes cursor FOR loops to perform similarly to BULK COLLECT queries (covered in “Bulk Processing with BULK COLLECT and FORALL,” in the September/October 2012 issue of ).

So even though your code looks as if you are fetching one row at a time, Oracle Database will actually fetch 100 rows at a time—and enable you to work with each row individually.

If the statement doesn’t identify any rows to be fetched, Oracle Database will raise the NO_DATA_FOUND exception.

Here are some examples of using SELECT-INTO: Get the last name for a specific employee ID (the primary key in the employees table): If there is a row in the employees table with ID 138, this block will display the last name of that employee.

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Fetch columns from different tables: DECLARE l_last_name employees.last_name%TYPE; l_department_name departments.department_name%TYPE; BEGIN SELECT last_name, department_name INTO l_last_name, l_department_name FROM employees e, departments d WHERE e.department_id=d.department_id AND e.employee_id=138; DBMS_OUTPUT.put_line ( l_last_name || ' in ' || l_department_name); END; the column values in either or both of the tables.

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