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Posted by / 19-Jul-2020 21:53

Cursors for updating

You give the cursor a name and associate it with a specific query.You can optionally declare a return type for the cursor, such as DECLARE my_emp_id NUMBER(6); -- variable for employee_id my_job_id VARCHAR2(10); -- variable for job_id my_sal NUMBER(8,2); -- variable for salary CURSOR c1 IS SELECT employee_id, job_id, salary FROM employees WHERE salary The cursor is not a PL/SQL variable: you cannot assign values to a cursor or use it in an expression.It is important not to allow one operation to succeed while the other fails.At the end of a transaction that makes database changes, Oracle makes all the changes permanent or undoes them all.Also, you can add new formal parameters without having to change existing references to the cursor.statement retrieves the rows in the result set one at a time.PL/SQL also conforms to the current ANSI/ISO SQL standard.In addition to static SQL discussed in this chapter, PL/SQL also supports dynamic SQL, which enables you to execute SQL data definition, data control, and session control statements dynamically.

CREATE TABLE employees_temp AS SELECT employee_id, first_name, last_name FROM employees; DECLARE emp_id employees_temp.employee_id%TYPE; emp_first_name employees_temp.first_name%TYPE; emp_last_name employees_temp.last_name%TYPE; BEGIN INSERT INTO employees_temp VALUES(299, 'Bob', 'Henry'); UPDATE employees_temp SET first_name = 'Robert' WHERE employee_id = 299; DELETE FROM employees_temp WHERE employee_id = 299 RETURNING first_name, last_name INTO emp_first_name, emp_last_name; COMMIT; DBMS_OUTPUT.A transaction is a series of SQL data manipulation statements that does a logical unit of work.For example, two statements might credit one bank account and debit another.As the following example shows, you can initialize cursor parameters to default values.You can pass different numbers of actual parameters to a cursor, accepting or overriding the default values as you please.

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After creating a sequence, you can use it to generate unique sequence numbers for transaction processing. PUT_LINE ('Initial sequence value: ' || TO_CHAR(seq_value)); -- The NEXTVAL value is the same no matter what table you select from -- You usually use NEXTVAL to create unique numbers when inserting data. NEXTVAL, 'Lynette', 'Smith'); -- If you need to store the same value somewhere else, you use CURRVAL INSERT INTO employees_temp2 VALUES (employees_seq.

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