Updating multiple rows in pl sql
In Example 6-1, a PL/SQL anonymous block declares three PL/SQL variables and uses them in the static SQL statements DROP TABLE employees_temp; CREATE TABLE employees_temp AS SELECT employee_id, first_name, last_name FROM employees; DECLARE emp_id employees_temp.employee_id%TYPE := 299; emp_first_name employees_temp.first_name%TYPE := 'Bob'; emp_last_name employees_temp.last_name%TYPE := 'Henry'; BEGIN DROP TABLE employees_temp; CREATE TABLE employees_temp AS SELECT employee_id, first_name, last_name FROM employees; DROP TABLE employees_temp2; CREATE TABLE employees_temp2 AS SELECT employee_id, first_name, last_name FROM employees; DECLARE seq_value NUMBER; BEGIN .
You can get information about any session cursor from its attributes (which you can reference in procedural statements, but not in SQL statements).
To list the session cursors that each user session currently has opened and parsed, query the dynamic performance view Note: Generally, PL/SQL parses an explicit cursor only the first time the session opens it and parses a SQL statement (creating an implicit cursor) only the first time the statement runs. A SQL statement is reparsed only if it is aged out of the cache by a new SQL statement.
Although you must close an explicit cursor before you can reopen it, PL/SQL need not reparse the associated query.
I think that Ali H's point is that it's not necessary to assign it to a variable until you have another SQL statement that would affect the row count.
As you can probably guess, there are situations where using PL/SQL can be the better option.
Such as in life, in technology the only guarantee is that there are no guarantees.
When the error is raised, an alert is issued to the alert log and DBMS_SQL becomes inoperable for the life of the session.
If the actual value for the cursor number in a call to the IS_OPEN Function denotes a cursor currently open in the session, the return value is subprogram that has no formal parameter for the cursor number; rather, it returns a cursor number. DEFINE_ARRAY(c, 1, n_tab, 10, indx); d := DBMS_SQL.