1. JDBC by Jon Pearce

2. DBase Concepts

3. Terms Table Row/Entity Column/Field/Attribute Key/Primary Key/Foreign Key

4. Entity-Relation Diagram Person OID FIRST LAST ADDRESS PHONE Phone OID AREA NUMBER Address OID STREET CITY STATE 1 * * 1

5. Person Table OIDFIRSTLASTADDRESSPHONE 500BillDing282150 501CarlLaFong283151

6. Address Table OIDSTREETCITYSTATE 282 123 Sesame NYCNY 283 77 Sunset LACA

7. Phone Table OID AREA CODE NUMBER 150212555-4321 151213333-5245

8. SQL SELECT-FROM-WHERE INSERT INTO UPDATE DELETE-FROM

9. Select SELECT field1, field2, field3... FROM table1, table2, table3... WHERE condition

10. Projection SELECT first, last FROM Person

11. Selection SELECT * FROM Person WHERE last LIKE 'D%'

12. Join SELECT * FROM Person, Address WHERE Person.Address = Address.OID

13. Insert INSERT INTO table (field, field,...) VALUES (value, value,...)

14. Update UPDATE table SET field = value,... WHERE condition

15. Delete DELETE FROM table WHERE condition

16. Cloudview

17. java.sql

18. JDBC Driver Types JDBC-to-ODBC Bridge Native API partly Java drivers JDBC-Net pure Java drivers Native-protocol pure Java drivers

19. JDBC Driver Types II

20. Informix Cloudscape

21. An SQL Browser

22. SQL Browser Declaration public class SQLBrowser extends Console { protected String driverName; protected String dbaseName; protected Connection connection; protected Statement statement; protected ResultSet result; public SQLBrowser(String db) throws SQLException, ClassNotFoundException {...} public void finalize() throws SQLException {...} private String toString (ResultSet rs) throws SQLException {...} public String execute(String sql) throws AppError {...} }

23. Connecting public SQLBrowser(String db) throws SQLException, ClassNotFoundException { Class.forName(driverName); dbaseName = "jdbc:cloudscape:rmi:" + db; connection = DriverManager.getConnection(dbaseName); statement = connection.createStatement(); meta = connection.getMetaData(); }

24. Executing a Query public String execute(String sql) throws AppError { String answer = "???"; try { result = statement.executeQuery(sql); answer = toString(result); } catch (SQLException e) { } return answer; }

25. Processing a Result Set private String toString (ResultSet rs) throws SQLException { StringBuffer results = new StringBuffer(); ResultSetMetaData metaData = rs.getMetaData(); int numCols = metaData.getColumnCount(); for(int i = 1; i <= numCols; i++) { // get column names results.append(metaData.getColumnName(i) + "\t"); } results.append("\n"); while(rs.next()) { // get next row for(int i = 1; i <= numCols; i++) { results.append(rs.getObject(i) + "\t"); } results.append("\n"); } return results.toString(); }

26. Closing the Connection public void finalize() throws SQLException { statement.close(); connection.close(); }

27. DBase DAO public class DBaseDAO { protected String driver; protected String url; // "protocol:subprotocol:dbase" protected Connection connection; public DBaseDAO(String d, String u) throws DAOException {...} protected void connect() throws Exception {...} public void close() throws DAOException {...} protected void finalize() {...} }

28. Connecting protected void connect() throws Exception { Class.forName( driver ); connection = DriverManager.getConnection( url ); connection.setAutoCommit( false ); }

29. DAO Pattern

30. DBasePersonDAO