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cdac databse technology normaliztion part-4

2010-04-24T02:06:00.000-07:00

Cdac original post part-3 for cdac mohali,cdac trivandrum,cdac pune,cdac hyderabad,noida and bangalore and recruitment from cdac.
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Here i am going on Data Normalization
Normalization

Database normalization is a technique for designing relational database tables to minimize duplication of information and to safeguard the database against certain types of logical or structural problems, namely data anomalies

Objectives

Data normalization aims to derive at records which avoid ?
Repetition of Data
Update anomalies
Insert Anomalies
Delete Anomalies

The Process of Normalization
Usually three steps (in industry) giving rise to
First Normal Form (1NF)
Second Normal Form (2NF)
Third Normal Form (3NF)
In academia
Boyce -Codd Normal Form (BCNF)
Fourth Normal Form (4NF)
Steps in Data Normalization
Attributes - Repeating Groups
When a group of attributes has multiple values then we say there is a repeating group of attributes in the entity

Functional Dependency

Consider a relation R that has two attributes A and B. The attribute B of the relation is functionally dependent on the attribute A if and only if for each value of A no more than one value of B is associated.
In other words, the value of attribute A uniquely determines the value of B

Stud_id -> stud_name
Stud_id -> Date of Birth
Module_id -> Module name
Marks -> grade

Full Functional Dependency

Let A and B be distinct collections of attributes from a relation R B is then fully functionally dependent on A if B is not functionally dependent on any subset of A.
(Stud_id, Module_id) -> marks

First Normal Form
A relation is in 1NF if and only if every attribute is single valued for
each tuple or row.

A relation is in 1NF if and only if there are no repeating groups of
Attribute values.

Example of First Normal Form
PURCHASE-ORDER (ORDER#, SUPPLIER#, ORDER-DATE
DELIVERY-DATE, (PART#, PART-DESCRIPTION,
QUANTITY-ORDERED, PRICE), TOTAL-PRICE)
Example in 1NF
PURCHASE-ORDER (ORDER#, SUPPLIER#, ORDER-DATE
DELIVERY-DATE, TOTAL-PRICE)
PURCHASE-ITEM-1 ( ORDER#, PART#, PART-DESCRIPTION,
QUANTITY-ORDERED, PRICE)
Example
STUDENT (Student#, student-name, student-address)

ENROLMENT (Student#, Course#, course-title,
tutor-name,tutor-staff#
1st Normal Form
Process results in separation of different objects
BUT anomalies may still exist
PURCHASE-ITEM-1( ORDER#, PART#, PART-DESCRIPTION,QUANTITY-ORDERED, PRICE)

PART-DESCRIPTION appears on every PURCHASE-ITEM occurrence.
This may result in anomalies when updating or deleting records
The problem in the example is that PART-DESCRIPTION is functionally dependent only on PART# (part of the identifier)
Second Normal Form
A relation is in 2NF if and only if it is in 1NF and all the
non-key attributes are fully functionally dependent on the
key.

Any entity type in 1NF is transformed to 2NF

Identify functional dependencies

Re-write entity types so that each non-identifying attribute is functionally dependent on the whole of the identifier
Example
PURCHASE-ORDER (ORDER#, SUPPLIER#, ORDER-DATE
DELIVERY-DATE, TOTAL-PRICE)
PURCHASE-ITEM-1 ( ORDER#, PART#, PART-DESCRIPTION,
QUANTITY-ORDERED, PRICE)
Functional Dependencies
PURCHASE-ORDER (ORDER#, SUPPLIER#, ORDER-DATE
DELIVERY-DATE, TOTAL-PRICE)
PURCHASE-ITEM-1 ( ORDER#, PART#, PART-DESCRIPTION,
QUANTITY-ORDERED, PRICE)

In 2nd Normal Form

Decompose PURCHASE-ITEM into two entity types
PURCHASE-ITEM (Order#, Part#, Quantity-Ordered, Price)
PART (Part#, Part-Description)
Original entity types are decomposed into three entity types in 2nd normal form
PURCHASE-ORDER (Order#,Supplier#, Order-Date, Delivery-Date, Total-Price)
PURCHASE-ITEM (Order#, Part#,Quantity-Ordered, Price)
PART (Part#, Part-Description)
Example in 2NF
STUDENT (Student#,Student-Name, Student-Address)
ENROLMENT ( Student#, Course#, Tutor-Name, Tutor-Staff#)
COURSE (Course#, Course-Title)

Third normal Form

A relation is in 3NF if and only if it is in 2NF and no
non-key attribute is transitively dependent on the key.

Any enity type in 2NF is transformed in 3NF

Determine functional dependencies between non identifying attributes
Decompose enity into new entities
Example
STUDENT (Student#,Student-Name, Student-Adderss)
ENROLMENT ( Student#, Course#, Tutor-Name, Tutor-Staff#)
COURSE (Course#,, Course-Title)
Functional Dependencies
STUDENT (Student#,Student-Name, Student-Adderss)
ENROLMENT ( Student#, Course#, Tutor-Name, Tutor-Staff#)
COURSE (Course#,, Course-Title)

Example in 3NF

STUDENT (Student#,Student-Name, Student-Adderss)
ENROLMENT ( Student#, Course#, Tutor-Staff#)
COURSE (Course#,, Course-Title)
TUTOR (Tutor-Staff#, Tutor-Name)
Example of Normal Forms

Functional Dependencies

Analysis of the sample FDs
1NF: Since PROGNAME and EMPID is the composite key, each cell contain single value so WORK is in 1NF.
The partial dependencies are
PROJNAME PROJMGR, BUDGET, STARTDATE
EMPID EMPNAME, SALARY, EMPMGR, EMPDEPT

Transform the relation work into an equivalent collection of 2NF relations
The relations schemes are:
PROJ ( PROJNAME, PROJMGR, BUDGET, STARTDATE)
EMP ( EMPID, EMPNAME, SALARY, EMPMGR, EMPDEPT)
WORK1 ( PROJANAME, EMPID, HOURS, RATING)
The above relations schemes are in 2NF.

Here is the download link download

cdac er diagram prsentation part-3

2010-04-24T01:54:00.000-07:00

Cdac original post part-3 for cdac mohali,cdac trivandrum,cdac pune,cdac hyderabad,noida and bangalore and recruitment from cdac.
Let me tell you before you go for this presenation how is the placement and recruitment in cdac going on.
I know about cdac hyderabad for cdac dabc its almost 100% and dac pune has around 80% ,desd pune has around 60% and desd hyderabad recruitment 70%.

Rest please you can enquire these things from orkut communities for 2010 created.
Here i am going on er model
Er diagram :-
These all wil be covered
Entity Sets
Relationship Sets
Mapping Constraints
Keys
E–R Diagram
Design of an E-R Database Schema
Reduction of an E-R Schema to Tables

Entity-Relationship Diagrams

Developed by Chen in 1965.
Purpose:
To facilitate database design by allowing the designer to express the logical properties of the database in an enterprise schema.

An enterprise schema is a description that corresponds to the conceptual level.

It is valid for any kind of DBMS and will remain correct even if the DBMS is changed.

The diagrams are basically design tools and documentation for the system.

Classified as a Semantic data model since it attempts to capture the meaning and structure.

Entity Relationship Model c

Representation of ER model

The items in the model represent the ‘things’ in the real-world, and the
relationships between the real-world things are expressed by relationships in the model.
The environment of the model consists of
Entities
Attributes
Keys
Super Keys, Candidate Keys, Primary Keys, Foreign Keys
Relationships
one-one , one-many, many-one, many - many
Dependencies
Existence Dependency
Aggregation and Generalization

Entity Sets

A database can be modeled as:
– a collection of entities,
– relationships among entities.

An entity is an object that exists and is distinguishable from other objects.
Example: specific person, company, event

An entity set is a set of entities of the same type that share same properties.
Example: set of all persons, companies, trees, holidays

Attributes

An entity is represented by a set of attributes, that is,
descriptive properties possessed by all members of an entity set.
Example:
customer = (customer-name, social-security,
customer-street, customer-city)
account = (account-number, balance)
Domain – the set of permitted values for each attribute
Attribute types:
– Simple and composite attributes.
– Single-valued and multi-valued attributes.
– Derived attributes.

Relationship Sets

A relationship is an association among several entities
An attribute can also be a property of a relationship set.

Degree of Relationship Set

Refers to number of entity sets that participate in a relationship set.

Relationship sets that involve two entity sets are binary sets.

Relationship sets may involve more than two entity sets. Relationship sets that involve two entity sets are ternary sets.

Roles

The labels “manager” and “worker” are called roles; they specify how employee entities interact via the works-for relationship set.

Roles are indicated in E-R diagrams by labeling the lines that connect diamonds to rectangles.

Mapping Cardinality
Express the number of entities to which another entity can be associated via a relationship set.

For a binary relationship set the mapping cardinality must be one of the following types:
– One to one
– One to many
– Many to one
– Many to many

Relationships
Relationships
Existence Dependencies
If the existence of entity x depends on the existence of entity y,
then x is said to be existence dependent on y.
– y is a dominant entity (loan)
– x is a subordinate entity (payment)

Keys
Each record in a table must be unique

A super key is a column, or a set of columns, that uniquely identifies a record in a table.

A minimal super key , with no proper subset that is also a super key, is called a candidate key.

A key consisting of more than one column is called a composite key.

A primary key is the candidate key that is selected by the database designer, to uniquely identify records within the table.
– the candidate keys not selected are called
alternate keys.

A foreign key is a column or set of columns within a table that is the candidate key of another table.

Weak Entity Sets
An entity set that does not have a primary key is referred to as a weak entity set.

The existence of a weak entity set depends on the existence of a strong entity set; it must relate to the strong set via a one-to-many relationship set.

The discriminator (or partial key) of a weak entity set is the set of attributes that distinguishes among all the entities of a weak entity set.

The primary key of a weak entity set is formed by the primary key of the strong entity set on which the weak entity set is existence dependent, plus the weak entity set’s discriminator.
Weak Entity Set
Specialization Example
Generalization
A bottom-up design process – combine a number of entity sets that share the same features into a higher-level entity set

Specialization and generalization are simple inversions of each other; they are represented in an E-R diagram in the same way.

Attribute Inheritance – a lower-level entity set inherits all the attributes and relationship participation of the higher-level entity set to which it is linked.

Aggregation
It is an abstraction of that allows us to group together objects into higher level objects.

Its inverse is decomposition, means breaking
up an object into its detailed components.
In ERD, aggregation is represented by placing a large labeled rectangle around the objects being aggregated, whether they are entity sets alone or include relationships.
Download here oroginal er diagram cdac presenattion download

cdac 2010 database presentation

2010-04-21T22:38:00.001-07:00

Database technology Part-2

THERE ARE MANY UPCOMING TECHNOLOGY DATABASE ABOUT ACCESS DATABASE
what is database
what is database system
what is database development will all be covered in this database presentation

web database technolgy is based on sql database and upcoming database are the fusion oracle database .
Smallest db is couchdb used in Iphone apps and in html5 .

Structured Query Language

It’s a relational database language
SQL commands are the means of communication with DBMS
SQL can be categorized as

DDL(Data Definition Language):Those SQL commands that
Operate on structure of database objects (table)?
Create,Alter,Drop.

DML(Data Manipulation Language): Those SQL commands
that operate on the data stored in the database objects.
Insert,Update,Delete,Select

DCL(Data Control Language): Those SQL commands that
Control the behavior of database objects
Commit,Rollback,Save point

Data types

Character data types
-CHAR(size):Stores fixed length character data.
Max size is 2000 bytes. Default & min size is 1 byte.

-VARCHAR2(size): Stores variable length character strings.
Max size is 4000 bytes, Min size is 1 byte. Must specify size.

-LONG:Columns defined as LONG can store variable-length
character data containing up to two gigabytes of information.

Number data types
-NUMBER(p,s): Stores numbers (fixed or floating point).

DATE: stores date & time. Standard format is
DD-MON-YY HH:MI:SS

Data types

LOB data types: Stores large blocks of unstructured
data (such as text, graphic images, video clips, and
sound waveforms) up to four gigabytes in size.
-BLOB: stores up to four gigabytes of binary data
-CLOB: stores up to four gigabytes of character data.
-BFILE:stores a file locator that points to an external file
containing the data.

RAW/LONG RAW:used to store binary data such as picture
image .
RAW max length 2000 bytes.
LONG RAW: 2gigabytes.

DML consist of-

Create
Alter
Drop

here is the link to download
download original cdac ppt

10g databaseaccess databasec# access databaseclient databaseconnecting databaseconnection databaseconvert access to sqlcopy technologydatabase advantagesdatabase codedatabase comparisondatabase conceptsdatabase connectdatabase engineeringdatabase fromdatabase indiadatabase installationdatabase introductiondatabase programsdatabase querydatabase replicationdatabase stored proceduresdatabase systemdatabase tablesdatabase technologiesdatabase technologydatabase withdatabases for dummiesdb databasedbms databasedelete databasedesigning databaseexample databasehow to databaseinstall databaselinux databasemicrosoft sqlmicrosoft sql servermicrosoft technologyms sql server databasemssql databasenew database technologiesperformance sqlperformance sql serverperformance sql server 2000performance tuning sql serverppt databaseselect databaseserver databasesql 2000sql databasesql database designsql generatorsql scriptssql serversql server 2000sql server 2000 tutorialsql server applicationssql server copy tablesql server database designsql server databasessql server dbasql server programmingsql server toolssql server tutorialssql technologysqlserver databasetable databasetechnology databasestrigger databaseusing databaseweb database applicationweb database technologies

cdac hyderabad original ppt on sql database and sql database server from hyderabad

2010-04-14T08:48:00.000-07:00

this post consist of information technology database and database management as well as sql database
mainly consist of -
FMS & Disadvantages
Data redundancy and inconsistency
Difficulty in accessing the data
Data isolation
Integrity problems
Atomicity problems
Concurrent access anomalies
Security problems
Database Management System
Control of data redundancy
Sharing of data
Maintenance of Integrity
Control over Security
Data abstraction
Data independence
Data Abstraction

Data Models
-Hierarchal Model
-Network Model
-Relational Model

Relational Data Base Management System Concepts covered below
Let me explain you something-
Data :- It is defined as an information that can be recorded
and that has implicit meaning.

Database : Collection of related data, stored in a standardized format ,designed to be shared by multiple users.

DBMS(Data Base Management System):-
It consists of collection of inter related data and a set of
programs to access the data
It provides a convenient & efficient environment for inserting, retrieving,modifying and storing database information.

Database Applications
Banking: all transactions
Airlines: reservations, schedules
Universities: registration, grades
Sales: customers, products, purchases
Manufacturing: production, inventory, orders, supply chain
Human resources:employee records, salaries, tax deductions

Basic Concepts

DBMS provides users with an abstract view of data.
It hides the complex data structures for the representation of data in database.
Levels of abstraction
Physical level : Lowest level of abstraction describes how data is stored.

Logical level : Next higher level of abstraction describes what data is stored and the relationships among the data

View level : Highest level of abstraction describes only part of database.

Data Independence
Physical data
independence
Ability to modify the physical schema without causing application programs to be rewritten
Data Model
An integrated collection of concepts for describing data, relationships between data and constraints on the data.

A data model comprises three components:
– a structural part (a set of rules describing how
the database is to be constructed)?
– a manipulative part (defines the types of operations allowed on the data)?
– a set of integrity rules (ensures data accuracy)?

Types of data models
Object-based logical models: Based on collection of objects.
ER-model,object-oriented model
Record-based logical model:Database is structured in fixed format record.
Hierarchical,Network,relational models

Entity-Relationship Model
Example of schema in the entity-relationship model
Hierarchical model
A Hierarchical database consists of a collection of records that are connected to each other through links.

The hierarchical data model organizes data in a tree structure

Parent-child relationship (one-to-one or one-to-many) among data
Hierarchical data model
Hierarchical data model
Network Model

A Network database consists of a collection of records connected to one another through links,which can be viewed as pointers.

The records in the database are organized as collections of arbitrary graphs.

One-to-one, one-to-many, many-to-one, or many-to-many relationships possible

Relational Model
A relational model consists of relations which represents data and the relationships among data..
A relation is a two dimensional table with special properties.
A relational table is a collection of columns and rows
columns are called attributes and rows are called tuples.

Properties of Relational Tables
Table name is distinct from all other table names in the database.
Each cell of table contains exactly one atomic (single) value.
Each column has a distinct name.
Values of a column are all from the same domain.
Each record is distinct; there are no duplicate records.
Order of columns has no significance.
Order of records has no significance.
Relational Model
Example of tabular data in the relational model

Relational Keys
Each record in a table must be unique
A super key is a column, or a set of columns, that uniquely identifies a record in a table.
A minimal super key , with no proper subset that is also a super key, is called a candidate key.
A key consisting of more than one column is called a composite key.
A primary key is the candidate key that is selected by the database designer, to uniquely identify records within the table.
– the candidate keys not selected are called
alternate keys.
A foreign key is a column or set of columns within a table that is the candidate key of another table

Relational Integrity
A set of integrity rules ensure that the data is accurate.
Domain Integrity:Defines the domain constraint for each column that restrict the set of values allowed for each column

Entity Integrity:In a table, no column of primary key can be null or duplicate.

Foreign key and Referential Integrity:If a foreign key exists in a table its value must
-either match with candidate key value of some record in the home table
-or be wholly null

Database technology Part-2

THERE ARE MANY UPCOMING TECHNOLOGY DATABASE ABOUT ACCESS DATABASE
what is database
what is database system
what is database development will all be covered in this database presentation

web database technolgy is based on sql database and upcoming database are the fusion oracle database .
Smallest db is couchdb used in Iphone apps and in html5 .

Structured Query Language

Data types

DML consist of-

Create
Alter
Drop

10g databaseaccess databasec# access databaseclient databaseconnecting databaseconnection databaseconvert access to sqlcopy technologydatabase advantagesdatabase codedatabase comparisondatabase conceptsdatabase connectdatabase engineeringdatabase fromdatabase indiadatabase installationdatabase introductiondatabase programsdatabase querydatabase replicationdatabase stored proceduresdatabase systemdatabase tablesdatabase technologiesdatabase technologydatabase withdatabases for dummiesdb databasedbms databasedelete databasedesigning databaseexample databasehow to databaseinstall databaselinux databasemicrosoft sqlmicrosoft sql servermicrosoft technologyms sql server databasemssql databasenew database technologiesperformance sqlperformance sql serverperformance sql server 2000performance tuning sql serverppt databaseselect databaseserver databasesql 2000sql databasesql database designsql generatorsql scriptssql serversql server 2000sql server 2000 tutorialsql server applicationssql server copy tablesql server database designsql server databasessql server dbasql server programmingsql server toolssql server tutorialssql technologysqlserver databasetable databasetechnology databasestrigger databaseusing databaseweb database applicationweb database technologies
long time thought to have post on database with ppt presentation and download mateial on postgresql open source database oracle database we have already shown sql oracle database exacmple with java database connectivity
We will also be going to cover database interview questions database management system some advance topics in my later post anime database pdf database these questions stored like pet society database kind. many are free database like mysql and new small db couchdb used in iphone and also in mozilla but you can easily create database like for movie database or using some software a database software
below a presentation for database access and database examples and you will like to know foxpro database which we have some slides.
YOu have worked on alter database archivelog navicat and a multimedia database

10g database
access database
c# access database
client database
connecting database
connection database
convert access to sql
copy technology
database advantages
database code
database comparison
database concepts
database connect
database engineering
database from
database india
database installation
database introduction
database programs
database query
database replication
database stored procedures
database system
database tables
database technologies
database technology
database with
databases for dummies
db database
dbms database
delete database
designing database
example database
how to database
install database
linux database
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microsoft technology
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performance tuning sql server
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sql server tutorials
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using database
web database application
web database technologies

2009-10-01T09:05:00.000-07:00

part-4 hibernate

download presentation about hibernatedownload
part-2 hibernate
consist of hibernate mapping
one to one mapping example
one to many hibernate example 3.3.2
many to one hibernate example with hibernate struts and hibernate apache configuration

2009-10-01T08:53:00.000-07:00

All about hibernate tutorial,presentation,assignment from cdac original post

all information about cdac training,diploma for cdacnoida,cdac mohali,cdac centers location,cdac entrance exam preparation

Mainly for dabc,dac,acts,cdac.in,cdac 2009
many topics covered in

hibernate 2,hibernate 3.2.5,hibernate 3.2.6,hibernate 3.3,hibernate 3.3.1,hibernate apache,hibernate architecture,hibernate bean,hibernate component,hibernate configuration,hibernate createquery,hibernate discriminator,hibernate formula,hibernate hbm.xml,hibernate index,hibernate inner join,hibernate interface,hibernate jdeveloper,hibernate left join,hibernate like,hibernate loading,hibernate name,hibernate optimistic locking,hibernate overview,hibernate pattern,hibernate persistence.xml,hibernate plugin,hibernate presentation,hibernate project,hibernate query,hibernate session.save,hibernate source,hibernate spatial,hibernate statistics,hibernate union,hibernate unique,hibernate uniqueresult,hibernate usertype,hql hibernate,install hibernate,jdbc hibernate,native hibernate,pojos action,servlet hibernate

click below links to get all information
download presentation about hibernatedownload ppt

2009-09-27T07:08:00.000-07:00

some more things about hibernate before downloading presentation and material
common interview question about hibernate
what are the interfaces used in hibernate name them?
The five core interfaces are used in just about every Hibernate
application. Using these interfaces, you can store and retrieve
persistent objects and control transactions.
Session Interface
SessionFactory Interface
Configuration Interface
Transaction Interface
Query and Criteria Interface

the power point slide,ppt you can download from here
download

2009-09-26T00:47:00.000-07:00

part-2 click above links for more information on hibernate
or here
Hibernate3.2 with struts tutorial and assignment

Checking if objects are identical
Java defines two notations:
Object identity [==]
Equality of value [.equals()]
In SQL it is just checking if the two primary keys are the same.
Two or more objects can represent the same row of data.
Problem with SQL surrogate keys

>>what is Object Graph Navigation you will know in this presentation(power point slide ppt)

>>>>what is Object/relational Mapping (ORM)
ORM is the automated & transparent persistence of Java objects to tables in a RDBMS.

Metadata describes the mapping between the objects and the database.

ORM works by transforming data from one representation to another

Contains the following parts
API for CURD operations on objects

API for queries for classes & properties

Facility for mapping metadata

Technique for interaction with transactional objects

more info click below

part-1 hibernate

2009-09-26T00:21:00.000-07:00

All about hibernate tutorial,presentation,assignment from cdac original post

all information about cdac training,diploma for cdacnoida,cdac mohali,cdac centers location,cdac entrance exam preparation

Mainly for dabc,dac,acts,cdac.in,cdac 2009

hibernate 2,hibernate 3.2.5,hibernate 3.2.6,hibernate 3.3,hibernate 3.3.1,hibernate apache,hibernate architecture,hibernate bean,hibernate component,hibernate configuration,hibernate createquery,hibernate discriminator,hibernate formula,hibernate hbm.xml,hibernate index,hibernate inner join,hibernate interface,hibernate jdeveloper,hibernate left join,hibernate like,hibernate loading,hibernate name,hibernate optimistic locking,hibernate overview,hibernate pattern,hibernate persistence.xml,hibernate plugin,hibernate presentation,hibernate project,hibernate query,hibernate session.save,hibernate source,hibernate spatial,hibernate statistics,hibernate union,hibernate unique,hibernate uniqueresult,hibernate usertype,hql hibernate,install hibernate,jdbc hibernate,native hibernate,pojos action,servlet hibernate

It includes
1)What is persistence?
The paradigm mismatch
Persistence layers and alternatives
Object/relational mapping

2)what is Paradigm Mismatch definition..?
Problems caused when objects need to be stored in relational tables.
Granularity
Subtypes
Identity
Associations
Graph Navigation

3)Problem of Granularity
Objects can have various kinds of granularity (structure ??) to its data.
Poor support for used defined types (UDT) in SQL.
No implementation is portable.
Forces developers to use less flexible representations on the object model

4)hibernate Problem of Subtypes
Java objects implements inheritance (super & sub classes).
Each sub or super class will define different data & completely different functionality.
An object can be associated with objects of different classes, but of same type (polymorphism).
SQL provides no support for inheritance or polymorphism

continue to next post

solutions for jdbc assignment,examples jdbc,prepared statement,jdbc connectivity with msaccess,mysql and oracle example

2009-09-16T08:11:00.000-07:00

example consist of type1 type2 type3 and type4 driver

jdbc1 example
import java.sql.*;
import java.io.*;

public class JDBC1
{
public static void main(String[] args) throws ClassNotFoundException,SQLException,IOException
{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:odbc:name","scott","tiger");
Statement stmt=con.createStatement();
DataInputStream dis=new DataInputStream(System.in);
try{ while(true)
{
ResultSet rs=stmt.executeQuery("select * from emp");

System.out.println("Please enter the name of the column to be fetched");
String col=dis.readLine().trim();
System.out.println(col);
if(col==null)
break;
rs.next();
while(rs.next())
{
System.out.println(rs.getString(col)+" "+rs.getString(2));
}
}}catch(Exception e)
{System.out.println("error while entering");
}
}
};

jdbc example2 connecting with mysql
import java.sql.*;

public class JDBC2
{
public static void main(String[] args)
{
try
{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost/shob","root","");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from login");
while(rs.next())
{
System.out.println(rs.getString(1)+" "+rs.getString(2));
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
}

jdbc example 3 with wamp sql little change
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Wampsql {
public static void main(String args[]) throws Exception {
Class.forName("com.mysql.jdbc.Driver");
String url;
url ="jdbc:mysql://localhost/shob" ;

String user, pass;
user = "root";
pass = "";

Connection con;
Statement stmt;
ResultSet rs;

try {
con = DriverManager.getConnection(url, user, pass);
stmt = con.createStatement();
rs = stmt.executeQuery("SELECT * FROM login");

// Get the resultset ready, update the passwd field, commit
//rs.first();
//rs.updateString("message_text", "updated");
//rs.updateRow();
System.out.println(rs.getString(1));

rs.close();
stmt.close();
con.close();
} catch (SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
}
}
}

jdbc example 1 more driver

import java.sql.*;

public class JDBC4
{
public static void main(String[] args) throws ClassNotFoundException,SQLException
{
String serverName="esurakshaxp4";
String portNumber="1521";
String sid="oracle";
String url="jdbc:oracle:thin:@"+serverName+":"+portNumber+":"+sid;
//String url="jdbc:mysql://localhost/quality_assurance_lms";
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
Connection con=DriverManager.getConnection(url,"scott","tiger");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from emp");
while(rs.next())
{
System.out.println(rs.getString(1)+" "+rs.getString(2));
}
}
}

solutions for assignment posted update salary

import java.sql.*;
import java.io.*;

public class UpdateTest
{
public static void main(String[] args)
{
try
{

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:dabctest","scott","tiger");
Statement st=con.createStatement();

DataInputStream dis=new DataInputStream(System.in);
System.out.println("Enter the Employee name :");

System.out.flush();
String str=dis.readLine();

System.out.println("Enter Salary :");
System.out.flush();
int newsal=Integer.parseInt(dis.readLine().trim());

int i=st.executeUpdate("update emp set sal="+newsal+" where ename='"+str+"'");
//System.out.println("update emp set sal="+newsal+" where ename='"+str+"'");
System.out.println("No of Rows Updated :"+i);
con.close();

}catch(Exception e)
{
System.out.println(e);
}

}
}

this is for prepare statement example and assignment solution
import java.io.*;
import java.sql.*;

public class PrepareTest
{

public static void main(String[] args)
{
Connection con=null;
PreparedStatement pst=null;
ResultSet rs=null;
DataInputStream dis=null;
try
{

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbc:odbc:dabctest","scott","tiger");
// Class.forName("com.mysql.jdbc.Driver");
//String s="jdbc:mysql://localhost/eSikshak1";
//con=DriverManager.getConnection(s,"root","");
pst=con.prepareStatement("Select * from emp where empno= ? and ename= ?");

dis=new DataInputStream(System.in);
while(true)
{
System.out.println("Enter the empno number :");
System.out.flush();
int eno=Integer.parseInt(dis.readLine().trim());
String enam=dis.readLine().trim();
if(eno==0)
break;
pst.setInt(1,eno);
pst.setString(2,enam);
rs=pst.executeQuery();

while(rs.next())
{
String enumber = rs.getString(1);
String ename = rs.getString(2);
System.out.println(enumber);
System.out.println(ename);

}
}
pst.close();
con.close();
}catch(Exception e)
{
System.out.println(e);
}

}
}

rest if some one needed post in comment please

jdbc assignment beginners question solved and unsolved with solution or without

2009-09-16T07:58:00.000-07:00

1. Implement
(a)Type 1 Driver and connect to the Oracle.
(B)Type2 Driver
(b)Type 3 Driver using IDS server and connect to mdb or oracle.
(c)Type 4 Driver and connect to Oracle and MySQL.

2. Implement Type-4 driver with
(a) Statement
(b) PreparedStatement
(c) CallableStatement

3. Use PreparedStatement to fetch results based on the some input taken from user inside a loop.

4. Use CallableStatement to call a stored procedure which takes empno and increment (salary) of that employee, as input, and returns the incremented salary as the output.

6. Write a program which takes input as the empno and salary.
a.) If the empno already exist and salary>2000, update the salary of the employee.
b.) If the empno doesn’t exist, ask for the all other column values in that table, retrieved using metadata programming.
c.) Insert empno and other values taken as input as part of (b.)
d.) If hiredate of employee is before year 1981, delete the record from the table.

7. Write a program to show use of all the methods for the Scrollable and Updatable ResultSets.

you will find solution on my next post

PART-3 JDBC TRANSACTION MANAGEMENT

2009-09-16T07:53:00.000-07:00

post consist of

1)jdbc transaction
2)Transaction Management
3)what is setAutoCommit?
4)JDBC Cursor Types
5)ResultSet type
6)ResultSet concurrency issue in jdbc
download the presentation ppt or power point from here
download presentation jdbc

7)TYPE_FORWARD_ONLY
8)TYPE_SCROLL_INSENSITIVE
9)TYPE_SCROLL_SENSITIVE
10)CONCUR_READ_ONLY,CONCUR_UPDATABLE
11)Result Set Methods next,previous,first,last,beforeFirst,afterLast,relative(),absolute all are methods
12)resultset can be updatable,scrollable,update process,insertion process
13)resultset meta data

PART2-JDBC API,jdbc tuorial and example

2009-09-16T07:43:00.000-07:00

post consist of basic jdbc api,javadatabase connectivity api ,presentation,tutorial,jdbc question and assignment and jdbc examples
here is the content what this jdbc ppt will consist
1)The JDBC API is available in the java.sql and javax.sql packages
2)JDBC classes, interfaces and exceptions
3)DriverManager,Connection,PreparedStatement and CallableStatement objects
4)Statement-retrieve ResultSet object
5)SQLException
7)Seven Steps For Using JDBC
Load The Driver
Define connection URL
Establish the connection
Create a statement object
Execute Query
Process the result
Close the connection.
8)JDBC Object Classes
9)JDBC Class Usage
10)The Flow Diagram
11)Loading/Registering A Driver
12)JDBC URLs
13)jdbc code and program Example

download link for jdbc api presentation
download

Part1-jdbc cdac presentation

2009-09-16T07:09:00.001-07:00

this post consist of jdbc cdac presentation contain jdbc tutorial
Like to tell you what is the content of the presentation (ppt,power point presentation)
JDBC stands for "Java DataBase Connectivity".

1)jdbc itroduction and JDBC Ancestry
2)Who develops JDBC Specification
3)Why use JDBC
4)JDBC Architecture
5)JDBC Drivers
Type I: “Bridge” JDBC-ODBC Bridge sun.jdbc.odbc.JdbcOdbcDriver
translates all JDBC calls into ODBC (Open DataBase Connectivity) calls and sends them to the ODBC driver
Type II: “Native” Native-API/partly Java Driver
This type of driver converts JDBC calls into calls to the client API for that database
Type III: “Middleware” Net-protocol/all-Java driver
the net-protocol/all-Java driver -- follows a three-tiered
Type IV: “Pure” Native-Protocol Driver the Direct to Database Pure Java Driver

so the first presentation consist of jdbc introduction
download presenation
download

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