JDBC+ORACLE分页查询

最新推荐文章于 2023-08-08 10:46:33 发布

iteye_6481

最新推荐文章于 2023-08-08 10:46:33 发布

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文章标签：数据库 java

本文介绍了一个Java Web应用中会话管理和数据库分页查询的具体实现。通过Servlet API创建并管理HTTP会话，设置会话超时，并演示了如何使用JDBC连接Oracle数据库进行分页查询操作。

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import java.io.IOException; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ResourceBundle; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class Session extends HttpServlet { private Connection connection; private PreparedStatement statement; private ResultSet set; public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(); session.setAttribute("", session.getId()); session.setMaxInactiveInterval(60 * 30); System.out.println(session.getAttribute("")); String sql="select num from (select rownum num from emp where rownum<?) where num>=?"; try { ResultSet set=set(1, 7, sql); while (set.next()) { System.out.println(set.getInt(1)); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } session.invalidate(); } public void init() { String driver = getString("db", "driver"); String url = getString("db", "url"); String user = getString("db", "user"); String password = getString("db", "password"); try { Class.forName(driver); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { connection = DriverManager.getConnection(url, user, password); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void destroy() { try { if (set != null) { set.close(); } if (statement != null) { statement.close(); } if (connection != null) { connection.close(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } private ResultSet set(int page, int rowsPerPage, String sql) throws SQLException { int start = (page - 1) * rowsPerPage + 1; int end = start + rowsPerPage; statement = connection.prepareStatement(sql); statement.setInt(1, end); statement.setInt(2, start); set = statement.executeQuery(); return set; } private String getString(String baseName, String key) { return ResourceBundle.getBundle(baseName).getString(key); } }
<servlet> <servlet-name></servlet-name> <servlet-class>Session</servlet-class> <load-on-startup>0</load-on-startup> </servlet> <servlet-mapping> <servlet-name></servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
driver=oracle.jdbc.driver.OracleDriver url=jdbc:oracle:thin:@localhost:1521:wish user=scott password=tiger