RosterDAO.java
资源名称:某公司的java培训教材 [点击查看]
上传用户:dinglihq
上传日期:2013-02-04
资源大小:99958k
文件大小:6k
源码类别:
Java编程
开发平台:
Java
- package bmpsample;
- //package j2eebootcamp.developingEJB.chapter9.roster;
- import java.util.Vector;
- import java.lang.reflect.*;
- import java.io.*;
- import javax.sql.DataSource;
- import java.sql.SQLException;
- import java.sql.ResultSet;
- import java.sql.Connection;
- import java.sql.PreparedStatement;
- import java.sql.Date;
- import java.sql.*;
- import javax.naming.InitialContext;
- import javax.naming.NamingException;
- import javax.naming.Context;
- import java.util.Calendar;
- //import j2eebootcamp.developingEJB.chapter9.roster.*;
- /**
- ** <code>RosterDAO</code> is a user-defined class.
- */
- public class RosterDAO {
- //private Connection connection = null;
- //private DataSource dataSource = null;
- public RosterDAO() throws RosterDAOException {
- try {
- // Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
- Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
- /* InitialContext ictx = new InitialContext();
- dataSource = (DataSource) ictx.lookup("java:comp/env/jdbc/JCampDS");
- System.out.println("RosterDAO jcampDataSource lookup OK!");*/
- }
- catch (Exception ne) {
- throw new RosterDAOException(
- "NamingException while looking up datasource connection =" +
- ne.getMessage());
- }
- }
- public Connection getConnection() throws RosterDAOException {
- Connection connection = null;
- try {
- connection = DriverManager.getConnection(
- "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=RegSystem;User=sa;Password=sa");
- //connection = dataSource.getConnection();
- }
- catch (SQLException se) {
- throw new RosterDAOException(
- " SQL exception while attempting to open connection =" +
- se.getMessage());
- }
- return connection;
- }
- public void closeConnection(Connection connection) throws RosterDAOException {
- try {
- if (connection != null && !connection.isClosed()) {
- connection.close();
- }
- }
- catch (SQLException se) {
- throw new RosterDAOException(
- " SQL exception while attempting to close connection =" +
- se.getMessage());
- }
- }
- public void closeResultSet(ResultSet rset) throws RosterDAOException {
- try {
- if (rset != null) {
- rset.close();
- }
- }
- catch (SQLException se) {
- throw new RosterDAOException(
- " SQL exception while attempting to close result set =" +
- se.getMessage());
- }
- }
- public void closeStatement(PreparedStatement pstmt) throws RosterDAOException {
- try {
- if (pstmt != null) {
- pstmt.close();
- }
- }
- catch (SQLException se) {
- throw new RosterDAOException(
- " SQL exception while attempting to close statement =" +
- se.getMessage());
- }
- }
- public void insert(String scheduleID, String studentID) throws
- RosterDAOException {
- PreparedStatement pstmt = null;
- Connection conn = this.getConnection();
- Calendar calendar = Calendar.getInstance();
- java.util.Date theTime = calendar.getTime();
- java.sql.Date now = new java.sql.Date(theTime.getTime());
- try {
- String updateStatement = "INSERT INTO RosterEJBTable (StudentID, ScheduleID, RegistrationDate) VALUES (?, ?, ?)";
- //String updateStatement = "INSERT INTO RosterEJBTable (StudentID, ScheduleID) VALUES (?, ?)";
- pstmt = conn.prepareStatement(updateStatement);
- pstmt.setString(1, studentID);
- pstmt.setString(2, scheduleID);
- pstmt.setDate(3, now);
- int rowCount = pstmt.executeUpdate();
- if (rowCount == 0) {
- throw new RosterDAOException("Update Failed for StudentID =" +
- studentID + " with ScheduleID =" +
- scheduleID);
- }
- pstmt.close();
- }
- catch (SQLException se) {
- throw new RosterDAOException(
- " SQL exception while attempting to open connection =" +
- se.getMessage());
- }
- }
- public void delete(String scheduleID, String studentID) throws
- RosterDAOException {
- PreparedStatement pstmt = null;
- Connection conn = this.getConnection();
- try {
- String updateStatement =
- "DELETE FROM RosterEJBTable WHERE ScheduleID= ? AND studentID = ?";
- pstmt = conn.prepareStatement(updateStatement);
- pstmt.setString(1, scheduleID);
- pstmt.setString(2, studentID);
- int rowCount = pstmt.executeUpdate();
- if (rowCount == 0) {
- throw new RosterDAOException("DELETE Failed for StudentID =" +
- studentID + " with ScheduleID =" +
- scheduleID);
- }
- pstmt.close();
- }
- catch (SQLException se) {
- throw new RosterDAOException(
- " SQL exception while attempting to open connection =" +
- se.getMessage());
- }
- }
- public Vector getClassList(String studentID) throws RosterDAOException {
- Vector classList = new Vector(20);
- PreparedStatement pstmt = null;
- Connection conn = this.getConnection();
- ResultSet rset = null;
- try {
- String updateStatement =
- "SELECT ScheduleID FROM RosterEJBTable WHERE studentID= ?";
- pstmt = conn.prepareStatement(updateStatement);
- pstmt.setString(1, studentID);
- rset = pstmt.executeQuery();
- while (rset.next()) {
- classList.addElement(rset.getString("ScheduleID"));
- }
- pstmt.close();
- }
- catch (SQLException se) {
- throw new RosterDAOException(
- " SQL exception while attempting to open connection =" +
- se.getMessage());
- }
- return classList;
- }
- } //;-)