jdbc Java Database Connectivity ujjwal matoliya jdbc.pptx
- 1. Department of Computer Science and Information Atal Bihari Vajpayee Vishwavidyalaya Ujjwal Matoliya JDBC Java Database Connectivity
- 2. INDEX What is a JDBC ?
- 3. INDEX What is a JDBC ? Why Should We Use JDBC ?
- 4. INDEX What is a JDBC ? Why Should We Use JDBC ? Why Should We Use Driver in JDBC ? types of JDBC drivers
- 5. INDEX What is a JDBC ? Why Should We Use JDBC ? Why Should We Use Driver in JDBC ? Types of Drivers in JDBC
- 6. INDEX What is a JDBC ? Why Should We Use JDBC ? Why Should We Use Driver in JDBC ? Types of Drivers in JDBC How to Establish a Data Base Connection and Executing SQL Statement
- 9. Creator
- 10. Creator User
- 11. Creator User
- 14. Application API
- 17. JDBC stands for Java Database Connectivity. JDBC is a Java API to connect and execute the query with the database. It is a part of JavaSE (Java Standard Edition). JDBC API uses JDBC drivers to connect with the database. JDBC
- 19. Why Should We Use JDBC Before JDBC, ODBC API was the database API to connect and execute the query with the database. But, ODBC API uses ODBC driver which is written in C language (i.e. platform dependent and unsecured). That is why Java has defined its own API (JDBC API) that uses JDBC drivers (written in Java language). We can use JDBC API to handle database using Java program and can perform the following activities: Connect to the database Execute queries and update statements to the database Retrieve the result received from the database.
- 20. JDBC Driver is a software component that enables java application to interact with the database. JDBC Driver
- 21. There are four types of JDBC drivers JDBC-ODBC Bridge Driver, Native Driver, Network Protocol Driver, and Thin Driver
- 22. The JDBC-ODBC bridge driver uses ODBC driver to connect to the database. The JDBC-ODBC bridge driver converts JDBC method calls into the ODBC function calls. This is now discouraged because of thin driver. 1.JDBC-ODBC Bridge Driver
- 23. Oracle does not support the JDBC-ODBC Bridge from Java 8. Oracle recommends that you use JDBC drivers provided by the vendor of your database instead of the JDBC-ODBC Bridge. Advantages: easy to use. can be easily connected to any database. Disadvantages: Performance degraded because JDBC method call is converted into the ODBC function calls. The ODBC driver needs to be installed on the client machine.
- 24. The Native API driver uses the client-side libraries of the database. The driver converts JDBC method calls into native calls of the database API. It is not written entirely in java. 2.Native API driver
- 25. Advantage: performance upgraded than JDBC-ODBC bridge driver. Disadvantage: The Native driver needs to be installed on the each client machine. The Vendor client library needs to be installed on client machine.
- 26. The Network Protocol driver uses middleware (application server) that converts JDBC calls directly or indirectly into the vendor-specific database protocol. It is fully written in java. 3.Network Protocol driver
- 27. Advantage: No client side library is required because of application server that can perform many tasks like auditing, load balancing, logging etc. Disadvantages: Network support is required on client machine. Requires database-specific coding to be done in the middle tier. Maintenance of Network Protocol driver becomes costly because it requires database-specific coding to be done in the middle tier.
- 28. The thin driver converts JDBC calls directly into the vendor-specific database protocol. That is why it is known as thin driver. It is fully written in Java language. 4.Thin driver
- 29. Advantage: Better performance than all other drivers. No software is required at client side or server side. Disadvantage: Drivers depend on the Database.
- 30. How to Establish a Data Base Connection and Executing SQL Statement
- 32. There are 5 steps to connect any java application with the database using JDBC. These steps are as follows: Register the Driver class Create connection Create statement Execute queries Close connection Java Database Connectivity
- 33. 1.)Register the driver class The forName() method of Class class is used to register the driver class. This method is used to dynamically load the driver class. public static void forName (String className)throws ClassNotFoundException Class.forName("oracle.jdbc.driver.OracleDriver");
- 34. 2.) Create the connection object The getConnection() method of DriverManager class is used to establish connection with the database. Connection con=DriverManager.getConnection ( "jdbc:oracle:thin:@localhost:1521:xe","system","password"); 1) public static Connection getConnection(String url)throws SQLException 2) public static Connection getConnection(String url,String n ame,String password) throws SQLException Example to establish connection with the Oracle database
- 35. 3.) Create the Statement object The createStatement ( ) method of Connection interface is used to create statement. The object of statement is responsible to execute queries with the database. public Statement createStatement()throws SQLException Example to create the statement object Statement stmt=con.createStatement ();
- 36. 4.)Execute the query The executeQuery() method of Statement interface is used to execute queries to the database. This method returns the object of ResultSet that can be used to get all the records of a table. public ResultSet executeQuery(String sql)throws SQLException Example to execute query ResultSet rs=stmt.executeQuery("select * from emp"); while(rs.next()){ System.out.println(rs.getInt(1)+" "+rs.getString(2)); }
- 37. 5.)Close the connection object By closing connection object statement and Result Set will be closed automatically. The close() method of Connection interface is used to close the connection. public void close()throws SQLException Example to close connection Con .close ();