1. JDBC Java API for Database Connectivity

2. Layout of this recitation Introduction to JDBC API JDBC Architecture Understanding the design of JDBC API –Classes and relations among them

3. What is an API? application program interface a set of routines, protocols, and tools for building software applications provides all the building blocks

4. What you expect in DB API 1.Open a Connection 2.Send a statement 3.Retrieve results 4.Close a connection 1.Create a connection Session 2.Execute statement 3.Send results 4.Close the session Java Application DBMS Engine Java DB API

5. Big picture Java Application JDBC Manager JDBC Drivers JDBC API JDBC Driver API Data Sources Grey Area

6. JDBC driver type-1 Uses the existing API Not the fastest JDBC-ODBC Bridge ODBC Driver Native Driver Net Driver Java Non Java

7. JDBC driver type-2 Uses vendor-provided local libraries Most efficient JDBC Driver Native Driver Net Driver Java Non Java

8. JDBC driver type-3 & 4 100% java. JDBC – Net Driver Java JDBC Driver Implements a proprietary Protocol in java Java

9. Complete JDBC Architecture Java Application JDBC Driver Manager JDBC Net Driver A JDBC–ODBC Bridge B JDBC Driver C JDBC Driver D ODBC Driver Native Driver B Native Driver C JDBC Interface JDBC Driver Interface ABDC

10. On Different Platforms DBMS PC MAC Unix JDBC Driver Classes JDBC API

11. JDBC Interface classes Java.sql package –DriverManager –Connection –Statement –CallableStatement –PreparedStatement –Resultset –ResultSetMetaData –DatabaseMetatData

12. JDBC Interfaces Driver Manager Connection Statement Prepared Statement ResultSet

13. Simple Example Import java.sql; class SimpleExample { public static void main(String args[]) { String url = “jdbc:odbc:mysource”; try { Class.forName(“sun.jdbc.odbc.JdbcOdbcDriver”); Connection myConnection = DriverManager.getConnection(url,”Bond”,”TopSecret”); myConnection.close(); } catch(java.lang.Exception) { ex.printStackTrace(); }

14. Sending SQL statements …… String query= “Select name,id,salary FROM employees ORDER By salary”; Connection myConnection = DriverManager.getConnection(…..); Statement myStatement = myConnection.createStatement(); ResultSet rs = myStatement.executeQuery(query); While(rs.next){ String empName = rs.getString(1); String empId = rs.getString(2); String empSalary = rs.getString(3); System.out.println(“Employee ” + empName + “ with id ” + empId + “ earns ” + empSalary); } myStatement.close(); myConnection.close(); …….

15. Statement’s Execute Methods ResultSet executeQuery() –For SQL selects int executeUpdate() –For Update,Delete,Insert and Create etc. boolean execute() –For either type –Returns resultSetisAvailable

16. Statements Statement PreparedStatement CallableStatement

17. Additional stuff Datatypes: basic to CLOB, BLOB Transaction Management DDA with/without cursors Batch updates Metadata –DatabaseMetaData –ResultSetMetaData –ParameterMetaData

18. Advanced Techniques Connection Pooling Dynamic SQL with Prepared Statements Auto-generated keys

19. References www.google.com http://java.sun.com/j2se/1.4/docs/api/ JDBC 3.0: Java Database Connectivity. –Bernard Van Haecke