Entity Object and Entity Associations in OAF

Entity Object: 

• The EO are used if one whishes to do some insert/update operations.
• EO represents a data base row in a table.
• EO will be based on the view(Oracle View) ,synonyms are snapshots.
• we need to create EO if we want to perform DML operations on OAF Page.
• All the EO ends with the EO. Example: EmployeeEO.
• When we create EO , One subclass will generate that is Example : Oracle.apps.fnd.framework.server.OAEnityImpl

we have to types of EO's.

1. PL/SQL Based EO's
2. Java Based EO's.

Note that we have 2 types of tables in Oracle apps they are custom tables and seeded tables.

if we want to perform the DML operations on standard(Seeded) tables then we go for PLSQL Based EO's and if we want to perform DML operations on custom tables then we go for Java based EO's.

Entity Associations:

• Entity Associations (AO)  is the relation ship between 2 EO's having one common column.
• All the AO's are end with AO. Example : EmpDeptAO.
• if we want to perform DML Operations on master detail page will go for AO.
• if we want to know common know column between two tables we wll go for AO's