Updating columns in oracle
You can do this at the record level or by referencing individual fields of that record, with the same dot notation used in SQL to refer to the column of a table.So if I declare a record as follows, Populating Records with Data Most of the time when you work with records, you will be assigning a row from a table to a record.Suppose I have an employees table in an application that looks like this: CREATE PROCEDURE process_employee ( employee_id_in IN omag_employees.employee_id%TYPE) IS l_employee_id omag_employees.employee_id%TYPE; l_last_name omag_employees.last_name%TYPE; l_salary omag_employees.salary%TYPE; BEGIN SELECT employee_id, last_name, salary INTO l_employee_id, l_last_name, l_salary FROM omag_employees WHERE employee_id = employee_id_in; END; (Note that I use suffixes in my parameters to indicate their mode.Here _in indicates an IN parameter.) That is, however, an awful lot of code to write, read, and maintain.Tables are made up of rows of data, each consisting of one or more columns, so it stands to reason that Oracle Database would make it as easy as possible to work with those rows of data inside a PL/SQL program.And it does precisely that through its implementation of the datatype, such as a number or string.
Listing 1 demonstrates an insert of a single row into the omag_employees table that specifies each column individually.
It’s rare, in fact, that the data with which you are working is just a single value, so records and other composite datatypes are likely to figure prominently in your PL/SQL programs.
This article explores how you declare records, populate them with rows from a table, and even insert or change an entire row in a table by using a record.
I can even shorten things further and write CREATE PROCEDURE process_employee ( employee_id_in IN omag_employees.employee_id%TYPE) IS l_employee omag_employees%ROWTYPE; BEGIN SELECT * INTO l_employee FROM omag_employees WHERE employee_id = employee_id_in; END; The SELECT * syntax tells Oracle Database to fetch all the columns in the table.
I can also use %ROWTYPE to declare a record that has the same structure as a SELECT statement in a cursor.