Download Adv. OOP Lecture 11-DB Step1,2

Advanced OOP MCS-3
OOP
BSCS-3
Lecture # 11
DATABASE CONNECTIVITY IN JAVA
JDBC Programming
• JDBC (Java Database Connectivity) is the specification
of a Java API that allows Java programs to access
DBMSs.
JDBC Programming Steps
Register
1) Register the driver
Connect
1) Create a connection to the
database
• The JDBC API consists of a set of interfaces and classes
written in the Java programming language.
• Using these standard interfaces and classes,
programmers can write applications that connect to
databases, send queries written in structured query
language (SQL), and process the results.
Query
1) Create a statement
2) Query the database
Process Results
1) Get a result set
2) Assign results to Java
variables
Close
1) Close the result set
2) Close the statement
3) Close the connection
DATABASE CONNECTIVITY IN JAVA
STEP 1: Register
• A JDBC driver is needed to connect to a database.
• Registering a driver requires the class name of the driver.
Example)
JDBC-ODBC: sun.jdbc.odbc.JdbcOdbcDriver
Oracle driver: oracle.jdbc.driver.OracleDriver
MySQL: com.mysql.jdbc.Driver
• Loading the driver class
• Class.forName(String);
• Defined in java.lang.Class (no need to import)
• It is possible to load several drivers.
• The class DriverManager manages the loaded driver(s).
DATABASE CONNECTIVITY IN JAVA
STEP 2: Connect
• JDBC URL for a database
• Identifies the database to be connected
• Consists of three-parts:
• <protocol>:<subprotocol>:<subname>
Protocol:
Protocol: JDBC
JDBC isis
the
the only
only protocol
protocol inin
JDBC
JDBC
Sub-protocol:
Sub-protocol:
identifies
identifies aa
database
database driver
driver
Subname:
thelocation
locationandand name of the
Subname: indicates the
database
nametoofbetheaccessed.
database Syntax
to be is driver specific.
DSN
name should
accessed.
Syntaxbe
is used.
driver specific
• The DriverManager allows you to connect to a database using the specified JDBC driver,
database location, database name, username and password.
• It returns a Connection object which can then be used to communicate with the database.
java.sql.DriverManager
• Connection getConnection(String)
//url
• Connection getConnection(String, String, String)
//url, username, password
DATABASE CONNECTIVITY IN JAVA
DSN
• A Data Source Name (DSN) is the logical name that is used by Open Database Connectivity
(ODBC) to refer to the driver and other information that is required to access data.
Create a System DSN in Windows
• From Control Panel, open Administrative Tools, and then open Data Sources(ODBC).
• Click the System DSN tab, and then click Add.
• Click the database driver that corresponds with the database type to which you are
connecting, and then click Finish.
• Type the data source name. Make sure that you choose a name that you can remember.
You will need to use this name later.
• Click Select.
• Click the correct database, and then click OK.
• Click OK, and then click OK.
GOOD LUCK !
☻. . .