How can I make this join in ADF and make CRUD operation in this

Question

How to make this relation in ADF
I have table employees and this is my master table
Table Name: Employees
Columns:
Employee_id(PK)
Employee_name
Employee_Salary
I have a child table that is called related employee that contains employees related to this employee
Table_name: Related_Employee
Columns:
Related_Employee_Table_Id(PK)
Employee_id(FK)
Related_Employee_Id
When I open employee id = 100 for example and add related employee id = 10
this is added with no problem but the requirement is that when I open employee 10 I find employee id 100 as related employee
How can I make this scenario.

Answer 1

The best way to understand this is to look at an example. If you are using an oracle database such as XE for you have a schema called hr. This shema has a number of tables two of which are departments and employees. a department has multiple employees correct. So in your example a employee may be related to x # of other employees perhaps. A very similar scenario as that in the hr Schema. If you don't have an Oracle XE database, download one from here -> http://www.oracle.com/technetwork/database/express-edition/downloads/index.html
Create Business Components off of the Departments and Employees schema and you'll see that due to the db design, you get what you're talking about for free (i.e. the join). Thus, you have the master-detail relationship you're looking for. For a quick tip, here is the relationship between departments and employees in the hr schema via a create script that you can exam with data inserts included:
SET SQLBLANKLINES ON
CREATE TABLE DEPARTMENTS
DEPARTMENT_ID NUMBER(4, 0) NOT NULL
, DEPARTMENT_NAME VARCHAR2(30 BYTE) NOT NULL
, MANAGER_ID NUMBER(6, 0)
, LOCATION_ID NUMBER(4, 0)
, CONSTRAINT DEPT_ID_PK PRIMARY KEY
DEPARTMENT_ID
USING INDEX
CREATE UNIQUE INDEX DEPT_ID_PK ON DEPARTMENTS (DEPARTMENT_ID ASC)
LOGGING
TABLESPACE "USERS"
PCTFREE 10
INITRANS 2
STORAGE
INITIAL 65536
MINEXTENTS 1
MAXEXTENTS UNLIMITED
BUFFER_POOL DEFAULT
ENABLE
LOGGING
TABLESPACE "USERS"
PCTFREE 10
INITRANS 1
STORAGE
INITIAL 65536
MINEXTENTS 1
MAXEXTENTS UNLIMITED
BUFFER_POOL DEFAULT
CREATE TABLE EMPLOYEES
EMPLOYEE_ID NUMBER(6, 0) NOT NULL
, FIRST_NAME VARCHAR2(20 BYTE)
, LAST_NAME VARCHAR2(25 BYTE) NOT NULL
, EMAIL VARCHAR2(25 BYTE) NOT NULL
, PHONE_NUMBER VARCHAR2(20 BYTE)
, HIRE_DATE DATE NOT NULL
, JOB_ID VARCHAR2(10 BYTE) NOT NULL
, SALARY NUMBER(8, 2)
, COMMISSION_PCT NUMBER(2, 2)
, MANAGER_ID NUMBER(6, 0)
, DEPARTMENT_ID NUMBER(4, 0)
, CONSTRAINT EMP_EMP_ID_PK PRIMARY KEY
EMPLOYEE_ID
USING INDEX
CREATE UNIQUE INDEX EMP_EMP_ID_PK ON EMPLOYEES (EMPLOYEE_ID ASC)
LOGGING
TABLESPACE "USERS"
PCTFREE 10
INITRANS 2
STORAGE
INITIAL 65536
MINEXTENTS 1
MAXEXTENTS UNLIMITED
BUFFER_POOL DEFAULT
ENABLE
LOGGING
TABLESPACE "USERS"
PCTFREE 10
INITRANS 1
STORAGE
INITIAL 65536
MINEXTENTS 1
MAXEXTENTS UNLIMITED
BUFFER_POOL DEFAULT
CREATE INDEX DEPT_LOCATION_IX ON DEPARTMENTS (LOCATION_ID ASC)
LOGGING
TABLESPACE "USERS"
PCTFREE 10
INITRANS 2
STORAGE
INITIAL 65536
MINEXTENTS 1
MAXEXTENTS UNLIMITED
BUFFER_POOL DEFAULT
CREATE INDEX EMP_DEPARTMENT_IX ON EMPLOYEES (DEPARTMENT_ID ASC)
LOGGING
TABLESPACE "USERS"
PCTFREE 10
INITRANS 2
STORAGE
INITIAL 65536
MINEXTENTS 1
MAXEXTENTS UNLIMITED
BUFFER_POOL DEFAULT
CREATE INDEX EMP_JOB_IX ON EMPLOYEES (JOB_ID ASC)
LOGGING
TABLESPACE "USERS"
PCTFREE 10
INITRANS 2
STORAGE
INITIAL 65536
MINEXTENTS 1
MAXEXTENTS UNLIMITED
BUFFER_POOL DEFAULT
CREATE INDEX EMP_MANAGER_IX ON EMPLOYEES (MANAGER_ID ASC)
LOGGING
TABLESPACE "USERS"
PCTFREE 10
INITRANS 2
STORAGE
INITIAL 65536
MINEXTENTS 1
MAXEXTENTS UNLIMITED
BUFFER_POOL DEFAULT
CREATE INDEX EMP_NAME_IX ON EMPLOYEES (LAST_NAME ASC, FIRST_NAME ASC)
LOGGING
TABLESPACE "USERS"
PCTFREE 10
INITRANS 2
STORAGE
INITIAL 65536
MINEXTENTS 1
MAXEXTENTS UNLIMITED
BUFFER_POOL DEFAULT
ALTER TABLE EMPLOYEES
ADD CONSTRAINT EMP_EMAIL_UK UNIQUE
EMAIL
USING INDEX
CREATE UNIQUE INDEX EMP_EMAIL_UK ON EMPLOYEES (EMAIL ASC)
LOGGING
TABLESPACE "USERS"
PCTFREE 10
INITRANS 2
STORAGE
INITIAL 65536
MINEXTENTS 1
MAXEXTENTS UNLIMITED
BUFFER_POOL DEFAULT
ENABLE;
ALTER TABLE DEPARTMENTS
ADD CONSTRAINT DEPT_LOC_FK FOREIGN KEY
LOCATION_ID
REFERENCES LOCATIONS
LOCATION_ID
ENABLE;
ALTER TABLE DEPARTMENTS
ADD CONSTRAINT DEPT_MGR_FK FOREIGN KEY
MANAGER_ID
REFERENCES EMPLOYEES
EMPLOYEE_ID
ENABLE;
ALTER TABLE EMPLOYEES
ADD CONSTRAINT EMP_DEPT_FK FOREIGN KEY
DEPARTMENT_ID
REFERENCES DEPARTMENTS
DEPARTMENT_ID
ENABLE;
ALTER TABLE EMPLOYEES
ADD CONSTRAINT EMP_JOB_FK FOREIGN KEY
JOB_ID
REFERENCES JOBS
JOB_ID
ENABLE;
ALTER TABLE EMPLOYEES
ADD CONSTRAINT EMP_MANAGER_FK FOREIGN KEY
MANAGER_ID
REFERENCES EMPLOYEES
EMPLOYEE_ID
ENABLE;
ALTER TABLE DEPARTMENTS
ADD CONSTRAINT DEPT_NAME_NN CHECK
(DEPARTMENT_NAME IS NOT NULL)
ENABLE;
ALTER TABLE EMPLOYEES
ADD CONSTRAINT EMP_EMAIL_NN CHECK
(EMAIL IS NOT NULL)
ENABLE;
ALTER TABLE EMPLOYEES
ADD CONSTRAINT EMP_HIRE_DATE_NN CHECK
(HIRE_DATE IS NOT NULL)
ENABLE;
ALTER TABLE EMPLOYEES
ADD CONSTRAINT EMP_JOB_NN CHECK
(JOB_ID IS NOT NULL)
ENABLE;
ALTER TABLE EMPLOYEES
ADD CONSTRAINT EMP_LAST_NAME_NN CHECK
(LAST_NAME IS NOT NULL)
ENABLE;
ALTER TABLE EMPLOYEES
ADD CONSTRAINT EMP_SALARY_MIN CHECK
(SALARY > 0)
ENABLE;
COMMENT ON TABLE DEPARTMENTS IS 'Departments table that shows details of departments where employees
work. Contains 27 rows; references with locations, employees, and job_history tables.';
COMMENT ON TABLE EMPLOYEES IS 'employees table. Contains 107 rows. References with departments,
jobs, job_history tables. Contains a self reference.';
COMMENT ON COLUMN DEPARTMENTS.DEPARTMENT_ID IS 'Primary key column of departments table.';
COMMENT ON COLUMN DEPARTMENTS.DEPARTMENT_NAME IS 'A not null column that shows name of a department. Administration,
Marketing, Purchasing, Human Resources, Shipping, IT, Executive, Public
Relations, Sales, Finance, and Accounting. ';
COMMENT ON COLUMN DEPARTMENTS.MANAGER_ID IS 'Manager_id of a department. Foreign key to employee_id column of employees table. The manager_id column of the employee table references this column.';
COMMENT ON COLUMN DEPARTMENTS.LOCATION_ID IS 'Location id where a department is located. Foreign key to location_id column of locations table.';
COMMENT ON COLUMN EMPLOYEES.EMPLOYEE_ID IS 'Primary key of employees table.';
COMMENT ON COLUMN EMPLOYEES.FIRST_NAME IS 'First name of the employee. A not null column.';
COMMENT ON COLUMN EMPLOYEES.LAST_NAME IS 'Last name of the employee. A not null column.';
COMMENT ON COLUMN EMPLOYEES.EMAIL IS 'Email id of the employee';
COMMENT ON COLUMN EMPLOYEES.PHONE_NUMBER IS 'Phone number of the employee; includes country code and area code';
COMMENT ON COLUMN EMPLOYEES.HIRE_DATE IS 'Date when the employee started on this job. A not null column.';
COMMENT ON COLUMN EMPLOYEES.JOB_ID IS 'Current job of the employee; foreign key to job_id column of the
jobs table. A not null column.';
COMMENT ON COLUMN EMPLOYEES.SALARY IS 'Monthly salary of the employee. Must be greater
than zero (enforced by constraint emp_salary_min)';
COMMENT ON COLUMN EMPLOYEES.COMMISSION_PCT IS 'Commission percentage of the employee; Only employees in sales
department elgible for commission percentage';
COMMENT ON COLUMN EMPLOYEES.MANAGER_ID IS 'Manager id of the employee; has same domain as manager_id in
departments table. Foreign key to employee_id column of employees table.
(useful for reflexive joins and CONNECT BY query)';
COMMENT ON COLUMN EMPLOYEES.DEPARTMENT_ID IS 'Department id where employee works; foreign key to department_id
column of the departments table';