Inserting updating records using pl sql cursor who is david cross dating
From the basics to virtualization and backup, we got you covered.Using PL/SQL Records in SQL Statements Pages: 1, 2 PL/SQL developers are demanding, no doubt about that.(Ideally we'd use DECLARE v_emprec employees%ROWTYPE := emp_util.get_one_row; BEGIN v_emprec.salary := v_emprec.salary * 1.2; UPDATE employees SET first_name = v_emprec.first_name, last_name = v_emprec.last_name, email = v_emprec.email, phone_number = v_emprec.phone_number, hire_date = v_emprec.hire_date, job_id = v_emprec.job_id, salary = v_emprec.salary, commission_pct = v_emprec.commission_pct, manager_id = v_emprec.manager_id, department_id = v_emprec.department_id WHERE employee_id = v_emprec.employee_id; END; DECLARE v_emprecs emp_util.emprec_tab_t := emp_util.get_many_rows; BEGIN -- This will not work, due to: -- PLS-00436: -- implementation restriction: -- cannot reference fields of -- BULK In-BIND table of records. In general, if you're already working with and populating records (particularly if you're transferring data from one table to another using records), you'll find this feature to be a wonderful enhancement.Records have always been a very powerful programming construct for PL/SQL developers.Use of records reduces code volume and also increases the resiliency of one's code, since a record defined using automatically (upon recompilation of the program) adapts to the current structure of the base cursor or table.The inability to utilize records within SQL DML statements in a PL/SQL program has long been a frustration to developers.The only exception is the CA Before Insert/Before Update/te events, but they only occur, if you set the connection to not work in bulks and only do single record operations. TABLEUPDATE() And this is very universal, step 1 can also mean to query any data you want to modify, in step 2 you cannot only append data to cursors, you can bind them to VFP forms controls and work on them as on DBF data.
It's even possible to update more than one table (eg via a view) if you have multiple primary keys of several tables in the alias, on which you apply the TABLEUPDATE().You can, on the other hand, insert using a record in the highly efficient 1 CREATE OR REPLACE PROCEDURE retire_them_now 2 IS 3 bulk_errors EXCEPTION; 4 PRAGMA EXCEPTION_INIT (bulk_errors, -24381); 5 TYPE employees_t IS TABLE OF employees%ROWTYPE 6 INDEX BY PLS_INTEGER; 7 retirees employees_t; 8 BEGIN 9 FOR rec IN (SELECT * 10 FROM employees 11 WHERE hire_date . LAST UPDATE employees SET ROW = v_emprecs (j) WHERE employee_id = v_emprecs (j).employee_id; END; DECLARE v_emprecs emp_util.emprec_tab_t := emp_util.get_many_rows; TYPE employee_id_tab_t IS TABLE OF employees.employee_id%TYPE INDEX BY PLS_INTEGER; v_employee_ids employee_id_tab_t; BEGIN -- Transfer just the IDs into their own -- collection for use in the WHERE clause -- of the UPDATE statement. Record-based DML was added to the PL/SQL language primarily as a "usability" feature, rather than one related to performance.It's most useful when the source of the row is one table and the target is a different table with the same column specification-for example, in a scenario where rows in an application table are updated once or many times and may eventually be deleted, and where the latest state of each row (including when it's been deleted) must be reflected in an audit table. Part of the challenge of integrating new features into your "box of tricks" is that you need to know when not to use them.This is shown here: Notice that we don't put the record inside parentheses. LAST LOOP v_employee_ids (j) := v_emprecs (j).employee_id; END LOOP; FORALL j IN v_emprecs. Is there, however, a penalty to be paid in runtime execution of this leaner code?You are, unfortunately, not able to use this technique with Native Dynamic SQL. Our tests (see Table 2) show for the most part that there's no measurable difference between field and record-based operations.