Lesson3
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This document discusses using JSP and servlets to connect to a database and perform SQL queries. It describes creating a dynamic web project with a servlet called DataServlet that connects to a database using a DBconnect class. The servlet can then execute SQL insert, update, delete, and select statements to manipulate and retrieve data from the database. A controller class with methods like insert abstract the database interaction and SQL execution.
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Lesson3
- 9. SQL) SQL) SQL Select query Update query Insert query Delete query
- 10. JSP Servlets and Database
- 13. Dynamic Web Project Servlet " DataServlet.ja
- 15. public class controller { DBconnect db = new DBconnect(); Statement stmt; ResultSet rs = null; public int insert(String sql) { try { db.createConnection(); stmt = db.getStatement(); stmt.executeUpdate(sql); } catch (SQLException ex) { Logger.getLogger(controller.class.getName()).log(Level.SEVERE,null, ex); return 0; } db.closeConnection(); return 1; }
- 20. UserDAO Mysql
- 21. display