JDBC is a Java API that provides interfaces for connecting to and working with databases. It allows Java applications to execute SQL statements and process the results by providing a standard interface for database access that is independent of database vendors. The key classes and interfaces in JDBC include Connection, Statement, PreparedStatement, CallableStatement, and ResultSet. JDBC drivers convert JDBC calls into database-specific protocols to communicate with the database.

1. JDBC
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2. How can I get information from database in my
Java application?

3. JDBC is the Java-based API, which provides a set
of classes and interfaces written in Java to access
and manipulate different kinds of databases

4. No matter what database is used!

5. JDBC takes care for you
I don’t care eh
eh eh …
Developer

6. JDBC is not an acronym.
It is often mistaken to be
"Java Database Connectivity"

7. Advantages
Continued usage of existing data
Vendor independent
Platform independent (Cross platform)
Ease of use
Behind the scenes
database

8. Two-Tier Data Processing Model

9. Three-Tier Data Processing Model

10. JDBC API

11. JDBC Drivers
. Converts the client request to a db understandable, native
format and present it to db.
. Converts the response to the Java format and presented to the
client.

12. JDBC Type 1 Driver (JDBC-ODBC Bridge)
Advantages :
MS Access or Microsoft SQL Server
Disadvantages:
don’t support software installation on client
native ODBC libraries must reside on the server =>
reduces the performance

13. JDBC Type 2 Driver (Native-API partly Java Driver)
Advantages :
Faster than Type 1
Disadvantages:
don’t support software installation on client

14. JDBC Type 3 Driver (JDBC Net pure Java Driver)
Converts JDBC calls into a DBMS-independent network protocol,
which is translated to database-specific calls by a middle-tier
server.
Advantages :
The most flexible type, High adaptability, control
underlying database without modifying the client side driver.
Disadvantages:
Database-specific code needs to be executed in the
middle- tier server. Needs to implement security like firewalls.

15. JDBC Type 4 Driver (Native-protocol pure Java Driver, Java to DB
Protocol)
Convert JDBC calls into the network protocol that communicates
directly with the database.
Advantages :
Communicate directly with the db engine using Java
Sockets.
Fastest JDBC drivers available.
No addition on clients.
Disadvantages:
database-specific

16. Steps to develop a JDBC App

17. Loading Driver
Class.forName(<protocol>)
Class.forName(“com.microsoft.sqlserver.jdbc.SQLServerDriver”);
Establishing a connection
Connection object
DriverManager.getConnection()
Connection cn =
DriverManager.getConnection("jdbc:sqlserver://localhost;DatabaseName=Dev
eloperApps;user=sa;Password=123456");

18. Creating statement and queries
Statement interface
Statement
PreparedStatement
CallableStatement
connection.createStatement()
PreparedStatement pstmt = cn.prepareStatement(“Select * from
ToppingDetails”);

19. executeQuery() & ResultSet object
connection.createStatement()
PreparedStatement pstmt = cn.prepareStatement(“Select * from
ToppingDetails”);
ResultSet rs = pstmt.executeQuery();
executeUpdate()
INSERT, DELETE, UPDATE, SQL DDL (Data Definition
Language)
return int value : row count
execute()
Return more than one result set
Return true if a result set object is generated

20. Handling exeption
ClassNotFoundException
SQLException

21. Processing queries
Data in the ResultSet is in a tabular format.
The initial cursor is positioned before the first
row
Traverse using next() method.
next() return :
true if the current cursor position is on a
valid row
false if the cursor is placed at a position
after the last row

22. Extract the data
getString()
getInt()
getFloat()
getObject()

23. Closing the Database Connection
close() method is provided by the Connection,
Statement, ResultSet objects.
rs.close();
pstmt.close();
cn.close();

24. Relationship of Connection to other objects

25. Interactions
&
relationships
between
the key JDBC
classes
and interfaces

26. Database metadata
Data about data.
defines structure and properties of the data stored.
Column name
Datatypes for columns

27. DatabaseMetaData interface
getMetaData()
Connection obj
DatabaseMetaData dmd = cn.getMetaData()

28. DatabaseMetaData method

29. ResultSetMetaData interface
metadata of ResultSet.
ResultSetMetaData rmd = rs.getMetaData()

30. ResultSetMetaData method
getColumnName()
getColumnCount()
getColumnType()
String colName = rmd.getColumnName(2);
int totalCols = rmd.getColumnCount();
String colType = rmd.getColumnType(1);