HRM DATABASE MANAGEMENT SYSTEM
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28-10-2010, 11:45 PM
HRM DATABASE MANAGEMENT SYSTEM
MINI PROJECT REPORT
LINDA MARIA PULICKAL
S5, COMPUTER SCIENCE AND ENGINEERING
COLLEGE OF ENGINEERING, TRIVANDRUM
HRM DATABASE MANAGEMENT SYSTEM.doc (Size: 149.5 KB / Downloads: 172)
TABLE OF CONTENTS
2. OBJECTIVES OF PROPOSED SYSTEM
3. ADVANTAGES OF PROPOSED SYSTEM
4. OVERALL DESCRIPTION
5. PROJECT REQUIREMENTS
6. DEFINITION OF PROBLEM
7. FEASIBILITY STUDY
8. OOP CONCEPTS
9. SOFTWARE DEVELOPMENT
10. DATA TABLES
11. ER DIAGRAMS
12. SAMPLE CODE
13. SCREEN SHOTS
This project and implimentation creates software that stores and manages all the data needed to describe the personnel and their framework within an organization. It includes definition of various levels of hierarchy in an organization, the salary structure pertaining to every element in this hierarchy, the description of every department functioning in the organization and the overall employee database which integrates elements in all the aforementioned.
It has a database administrator who has access to the entire database, in regards with viewing and update of information. This exclusive right is implemented using authorized access. Also viewing of all data and editing of personal data can be done by any employee, this also using authorized access. Communication between personnel and administrator has also been provided for.
The data can be accessed, manipulated and retrieved very easily. The interface has been made very user friendly. The data is well protected for use and the data processing ie, result of query functions has been made very quick and efficient.
OBJECTIVES OF PROPOSED SYSTEM
The Human Resource Database Management software is very user friendly and appealing. The main objective of the system is to maintain and retrieve information about the entire personnel framework of the organizational system. This system is fairly simple in design and implementation.
The main objectives of this system can be summarized as follows:
Design of a hierarchical framework in terms of positions held thus depicting the organizational hierarchy. Update of the structure of the same, as well as addition of new elements.
Search for all employees, departments, dependent information etc possible. Also department-wise, level-wise and other parameter based search enabled.
Communication between employee and administrator.
Computerized payroll generation, manipulation and management.
Easy management of databases of various sections covering key aspects.
ADVANTAGES OF PROPOSED SYSTEM
Very simple and easy to implement
Security of data
Ensure data accuracy
Administrator discretion and control over the entire system
Reduces the damages of machine
Minimizes manual data entry
User friendly and interactive
Less time consuming
GOALS OF THE PROPOSED SYSTEM:
Planned approach towards working: The working in the organization will be well planned and organized. The data will be stored efficiently with optimal disk space consumption in data stores which will help in retrieval of information as well as its storage under resource constraints.
Accuracy: The level of accuracy in the proposed system will be higher. All operations would conform to integrity constraints and correctness and it will be ensured that whatever information is received at or sent from the centre is accurate.
Reliability: The reliability of the proposed system will be high due to the above mentioned reasons. This comes from the fact that only the data which conforms to the accuracy clause would be allowed to commit back to the disk. Other properties like transaction management and rollback during system or power failure etc get automatically taken care of by the SQL systems, which is undoubtedly an excellent choice of the rear end of the dbms system. Properties of atomicity, consistency, isolation and data security are intrinsically maintained.
GOALS OF THE PROPOSED SYSTEM (..contd)
No redundancy: In the proposed system it will be ensured that no repetition of information occurs; neither on a physical storage nor on a logical implementation level. This economizes on resource utilization in terms of storage space. Also even in case of concurrent access no anomalies occur and consistency is maintained. In addition to all this, principles of normalization have been endeavored to be followed.
Immediate retrieval of information: the main objective of the proposed system is to provide a quick and efficient platform for retrieval of information. Among the queries allowed for use by the user, the query results are made available immediately, without time lapse, irrespective of the complexity of the query.
Ease of operation: The system should be simplistic in design and use. It is such that it can be easily developed within a short period of time and can conform to the financial and resource-related constraints of the organization.
Operating System: Windows 2000/XP/Vista
Front End: Java Net Beans
Rear End: Oracle SQL
Design Tool: UML
Processor: x86 compatible processor
RAM: 512 MB or greater
Hard Disk: 20 GB or greater
Keyboard: 104 keys standard
Mouse: 2/3 button. Optical/ Mechanical.
Every user :
Should be comfortable with basic working of the computer
Must have basic knowledge of English
Must carry a login ID and password used for authentication
The GUI is restricted to English
Login ID and password used for identification of user/administrator. There is no facility for a guest login
DEFINITIONS OF PROBLEM
Problems with the conventional system:
Lack of immediate retrievals: In the conventional system, information is distributed across several files. This might also lead to data redundancy with repetition of the same information in various files. In the event of a complex or nested query, the search has to scan several files, thus making procurement of requested query results very cumbersome.
Maintenance of Accuracy and Reliability issues: With redundancy comes consistency issues as the update of information in a single record should be echoed in all records containing the same information. Also atomicity issues ie, completion of a transaction in totality or nothing at all; has to be maintained. This is difficult in a multi-file system.
Lack of immediate information storage: The information generated by various transactions takes time and efforts to be stored at the appropriate places in various files. Time overhead occurs in the case of this search and access. Also resource utilization is an issue. Overconsumption of space is an inevitable result of data redundancy.
Lack of prompt update: Updates associated with a record in a file is to be reflected in all records wherein the particular record is present. This concurrent update poses the problem of time lag. Errors in commit operation to some particular files cause the grave issue of data inconsistency.
Error prone manual calculation: Manual calculations are error prone and relatively immensely time consuming, in spite of which they may result in generation of incorrect information. Verification is another overhead, which can be saved through efficient design and implementation
Improved Manual System: One of the alternative solutions is the improvement of the manual system. Anything, which can be done by using automated methods, can be done manually. But the key question is how to perform a task manually in a sound and optimal manner. Following are some suggestions, which can be useful in the manual system.
A more sophisticate register maintenance dedicated to each subsystem can be maintained with centralized control and evaluation. Adequate dedicated staff may be maintained so that updates are made at the very moment at the same time. Proper provision for paper work should be put into place. This would require considerable extra workforce.
Batch System: An alternative solution can be used of computer based batch system for maintaining the information regarding personnel details. A batch system refers to a system in which data is processed in a periodical basis. The batch system is able to achieve most of the goals and sub goals. But a batch system data is processed in sequential basis. Therefore batch system is not suggested.
Online System: This system (HRDBMS) provides online storage, update and retrieval facility. This system promises very less or no paper work and also provides help to administrator and company personnel. In this system everything is stored electronically so constraints of paper work are eliminated and multiple files usage is not required. Information can be retrieved very easily without scanning multiple registers. This system is been discussed here.
Depending on the results of the initial investigation the survey is now expanded to a more detailed feasibility study. Feasibility study is a test of system proposal according to its workability, impact on the organization, ability to meet needs and effective use of the resources. It focuses on these major questions:
What are the user’s demonstrable needs and how does a candidate system meet them?
What resources are available for given candidate system?
What are the likely impacts of the candidate system on the organization?
Whether it is worth to solve the problem?
During feasibility analysis for this project and implimentation, following primary areas of interest are to be considered. Investigation and generating ideas about a new system does this.
STEPS IN FEASIBILITY ANALYSIS:
The steps involved in the feasibility analysis are:
• Form a project and implimentation team and appoint a project and implimentation leader
• Prepare system flowcharts.
• Enumerate potential proposed system.
• Define and identify characteristics of proposed system.
• Determine and evaluate performance and cost effective of each proposed system.
• Weight system performance and cost data.
• Select the best-proposed system.
• Prepare and report final project and implimentation directive to management.
This is a study of resource availability that may affect the ability to achieve an acceptable system. This evaluation determines whether the technology needed for the proposed system is available or not. The key questions to be addressed are:
Can the work for the project and implimentation be done with current equipment existing software technology & available personnel.
Can the system be upgraded if further developments occur and requirements increase.
If new technology is needed then what can be developed.
Technical feasibility is concerned with specifying equipment and software that will successfully satisfy the user requirement. The technical needs of the system include:
FRONT-END AND BACK-END SELECTION:
An important issue for the development of a project and implimentation is the selection of suitable front-end and back-end. When we decided to develop the project and implimentation we went through an extensive study to determine the most suitable platform that suits the needs of the organization as
well as helps in development of the project and implimentation.
The aspects of our study included the following factors.
ADVANTAGES OF JAVA NETBEANS:
Creates sophisticated windows and applications in a short time.
Provision of inbuilt templates for visual elements like frames, labels, buttons etc.
Use of keyboard and mouse for visual design.
Automatic generation of standard codes.
Access to object oriented techniques supported by Java Language.
ADVANTAGES OF ORACLE SQL:
Multiple user support.
Efficient data handling.
Provide inherent features for security.
Efficient data retrieval and maintenance.
Operating System compatible.
Easy to install.
Various drivers must be available.
Easy to implant with the Front-end.
According to above stated features we selected Oracle SQL as the backend. The technical feasibility is frequently the most difficult area encountered at this stage. It is essential that the process of analysis and definition be conducted in parallel with an assessment to technical feasibility. It centers on the existing computer system (hardware, software etc.) and to what extent it can support the proposed system.
Economic justification is generally the “Bottom Line” consideration for most systems. Economic justification includes a broad range of concerns that includes cost benefit analysis. In this we weight the cost and the benefits associated with the candidate system and if it suits the basic purpose of the organization i.e. profit making, the project and implimentation is making to the analysis and design phase.
The financial and the economic questions during the preliminary investigation are verified to estimate the following:
The cost to conduct a full system investigation.
The cost of hardware and software for the class of application being considered.
The benefits in the form of reduced cost.
The proposed system will give the minute information, as a result the performance is improved which in turn may be expected to provide increased profits.
This feasibility checks whether the system can be developed with the available funds. The Human Resource Database Management System does not require enormous amount of money to be developed. This can be done economically if planned judicially, so it is economically feasible. The cost of project and implimentation depends upon the number of man hours required.
It is mainly related to human organizations and political aspects. The points to be considered are:
What changes will be brought with the system?
What organization structures are disturbed?
What new skills will be required? Do the existing staff members have these skills? If not, can they be trained in due course of time?
This system is operationally feasible as it very easy for the end users to operate it. It only needs basic information about the Windows platform.
Time evaluation is the most important consideration in the development of project and implimentation. The time schedule required for the developed of this project and implimentation is very important since more development time effect machine time, cost and cause delay in the development of other systems.
A reliable Human Resource Database Management System can be developed in a considerably appropriate amount of time.
OBJECT ORIENTED TECHNIQUES
Object oriented programming (OOP) is an approach to program organization and development that attempts to eliminate some of the pitfalls of conventional programming methods by incorporating the best of structured programming features with several powerful new concepts.
It is the way of organizing and developing programs and has nothing to do with any particular programming language.
OOP treats the data as a critical element in the programming development and does not allow it too freely around the system. It ties the data more closely to the functions that operate on it and protect it from accidental corruption and modification from outside functions.
OOP allows us to decompose a program into a number of entities known as CLASSES and then builds the data and functions around these entities. The data of an object can be accessed only by the functions associated with that object however the functions of one object can access the functions of other objects.
Some striking features of object-oriented programming are:
• Emphasis is on the data rather than the procedures.
• Programs are divided into objects
• Data structures are designed such that they characterize the objects,
• Functions that are supposed to work on the data of an object arc tied together in the data structure
• Data is hidden and cannot be accessed by external functions.
• Objects may communicate with each other through the public functions
• New data and functions can be easily added whenever necessary
• OOP follows a bottom-up approach in the program design.
OOP is an approach that provides a way of modularizing programs by creating partitioned memory area for both data and functions that can be used as templates for creating copies of such modules on demand.
Comparison of Structural Programming and Object-Oriented Programming
The conventional high-level languages based on the programming concepts give more importance to what to do and lesser importance to the data.
Structural approach stress on the algorithms used to solve the problem. The data is defined as global and made accessible to all the functions in the program without any restriction. The program is dived in to functions. Since the data is declared global any function can accidentally corrupt the data. Also any changes to the data require all functions that access the data to be changed. It has reduced data security and integrity, since the entire data is available to all the functions and any function can corrupt any data without impunity.
In OOPs we encapsulate the data and the associated functions together inside a module. Usually the data is kept private. The data cannot be accessed outside the class. The functions are made public and can be accessed from anywhere. The actual data is not directly accessible by the user. The object-oriented languages allow localization of the data and code and restrict other objects from referring to its local region.
The basic idea behind object-oriented approach is to combine data and functions that are supposed to work on these data together inside a module.
Characteristics of Object-Oriented Programming
CLASSES : In OOPs we collect all the data we require. After that we find all the functions that are supposed to work on these data. These we put together inside a module called a class. By default the access level of a number in a class is made private and the member functions in a class are made public.
OBJECT: The class is only an idea. The real things that we make from this idea are called objects. The object is an instance of class. It is a runtime entity.
DATA ABSTRACTION: Abstraction means hiding the irrelevant features and exposing only the relevant features. All data structures give data abstraction. Data abstraction means data is hidden from the user. The user knows only to use the data. In class we obtain higher level of data abstraction.
DATA ENCAPSULATION: The wrapping up of data and function into a single entity is known as Encapsulation. Data encapsulation is the most striking feature of the class. The data is not accessible to the outside world. Only those functions provide the interface between the object, data and program. This insulation of data from direct access by the program is called data hiding.
POLYMORPHISM: OOPs support the concept of polymorphism that enables a function to have different with the same name. There are two types of polymorphisms
i. Static or Compile-time Polymorphism: Static Polymorphism refers to a function existing with different definitions simultaneously in a class. Static polymorphism is implemented using function overloading and operator overloading.
ii. Dynamic or Run-time Polymorphism.: A function is said to exhibit dynamic polymorphism when calls to the various definitions of the function are resolved dynamically at run time. The compiler is able to associate a function call with the appropriate function definition in dynamic polymorphism based on the context of the function call, such as the contents of the pointer used to invoke the function. Dynamic polymorphism is implemented using virtual functions. In virtual functions, a pointer can point a base class member function and the redefined derived member function to perform different operations.
INHERITANCE: Inheritance is the process by which objects of one class acquire the properties of another class. It supports the concept of hierarchical classification. Inheritance is an importance concept of OOP that enables you to derive a new class from an existing class. The derived class inherits or receives the data members and member function s of the existing class and can also add its own data members and member functions
CODE REUSABILITY: The concept of inheritance gives rise to another important feature in object oriented languages. This feature is called reusability. Inheritance permits the reusability of classes by enabling derived classes to extend the capabilities of the base class. Derived classes can also be enhanced by adding additional features and capabilities, without modifying the base class.
MESSAGE COMMUNICATION: The different objects in the program are communicating through the public functions.
PHASES OF SOFTWARE DEVELOPMENT
Software Engineering deals with various tools, methods and procedures required for controlling the complexity of software development, project and implimentation management and its maintenance. Object-oriented development emphasizes on using programming languages with certain unique capabilities for real world object modeling. Object model is the conceptual framework for object-oriented development.
The four major elements of this model are Encapsulation, Abstraction, Modularity and Hierarchy.
Software systems pass through two principal phases during their lifecycle.
• The development phase
• The operation and maintenance phase
Software development passes through various phases. They include
Program Definition: The first stage in the development process is understanding the problem in question and its requirements. Requirements include the context in which the problem arouses, functionality expected from the system and system constraints.
Analysis: Analysis phase delivers requirement specification. The system specification serves as an interface between the design and the implementer as well as between the implementer and the user.
Design: Design is the process of mapping system requirements defined during analysis to an abstract representation of a specific system implementation. Since the whole system may be complex the main design objective is decomposition. The system is divided into modules and their interactions. The modules may be then further decomposed into sub modules and procedures until each module can be implemented easily.
Coding or Implementation: Once the specification and design of the software is over, the choice of the programming language remains as one of the most critical aspect in producing reliable software.
Testing: Testing is the process of evaluating a system or system components by manual or automated means to verify that it satisfies the specified requirements.
OBJECT ORIENTED ANALYSIS
Object oriented analysis provides a simple yet powerful mechanism for identifying objects, the building blocks of software to be developed. It is mainly concerned with decomposition of a problem, into components parts and establishing a logical model to describe the system.
Object oriented design is concerned with the mapping of objects in the problem space into objects in the solution space. It creates the overall architectural model and computational model of the system. In object-oriented design, structure of the complete system is built using bottom-up approach whereas class member functions are designed using top down functional decomposition. It is important to construct structured hierarchies, identify abstract base classes and simplify the inter object communication Reusability of classes from previous design using principles of inheritance, classification of objects into sub systems providing specialized services and determination of appropriate protocols are some of the consideration of the design stage.
Most of the object-oriented methodologies emphasize the following steps:
• Review of the objects created in the analysis phase
• Specification of class dependencies
• Organization of class hierarchies using inheritance principles.
• Design of classes
• Design of member functions
FIELD NAME DATA TYPE
PositionID (Primary key) NUMBER
FIELD NAME DATA TYPE
DeptID (Primary key) NUMBER
(Foreign Key from EMPLOYEE) NUMBER
FIELD NAME DATA TYPE
QualID (Primary key) NUMBER
FIELD NAME DATA TYPE
LevelNo (Primary key) NUMBER
FIELD NAME DATA TYPE
(Foreign Key from EMPLOYEE) NUMBER
Primary Key(DependentID, EmployeeID)
FIELD NAME DATA TYPE
EmployeeID (Primary key) NUMBER
(Foreign key from POSITION) NUMBER
(Foreign key from QUALIFICATION) NUMBER
(Foreign key from DEPARTMENT) NUMBER
(Foreign key from EMPLOYEE) NUMBER
//method to get connection
public Connection cc()throws SQLException
//method to insert table qualification
project and implimentation.Main m=new project and implimentation.Main();
String mm="insert into Qualification values(?,?)";
An Application software has been developed using oracle and java database programming connectivity via oracle driver so as to meet the requirements of an organization, thereby ensuring quality performance .The data can be accessed, manipulated and retrieved very easily. To conclude this software has proved to be a user friendly interface.
HRM DATABASE MANAGEMENT SYSTEM.doc (Size: 149.5 KB / Downloads: 172)
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