customerbean.java

21天学通J2EE的例子3

package data;

import java.rmi.*;
import java.sql.*;
import java.util.*;
import javax.ejb.*;
import javax.naming.*;
import javax.sql.*;

public class CustomerBean implements EntityBean
{
    private DataSource dataSource;
    private JobLocalHome jobHome;

    private String login;
    private String name;
    private String email;
    private String[] address = new String[2];

    public String getLogin () {
        return login;
    }

    public String getName () {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail () {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public void setAddress(String[] address){
        for (int i=0; i<Math.min(this.address.length,address.length); i++)
            this.address[i] = address[i];
    }

    public String[] getAddress() {
        String[] res = new String[address.length];
        System.arraycopy(this.address,0,res,0,res.length);
        return res;
    }

    // EJB methods start here

    public void ejbPostCreate (String login, String name, String email) {}

    public String ejbCreate (String login, String name, String email) throws CreateException {
        try {
            ejbFindByPrimaryKey(login);
            throw new CreateException("Duplicate customer name: "+login);
        }
        catch (FinderException ex) {}

        Connection con = null;
        PreparedStatement stmt = null;
        try {
            con = dataSource.getConnection();
            stmt = con.prepareStatement(
            "INSERT INTO Customer (login,name,email) VALUES (?,?,?)");

            stmt.setString(1, login);
            stmt.setString(2, name);
            stmt.setString(3, email);
            stmt.executeUpdate();
        }
        catch (SQLException e) {
            error("Error creating customer "+login,e);
        }
        finally {
            closeConnection(con, stmt, null);
        }
        this.login = login;
        this.name = name;
        this.email = email;
        this.address[0] = "";
        this.address[1] = "";
        return login;
    }

    public String ejbFindByPrimaryKey(String login) throws FinderException {
        Connection con = null;
        PreparedStatement stmt = null;
        ResultSet rs = null;
        try {
            con = dataSource.getConnection();
            stmt = con.prepareStatement(
            "SELECT login FROM Customer WHERE login = ?");

            stmt.setString(1, login);
            rs = stmt.executeQuery();

            if (!rs.next()) {
                throw new FinderException("Unknown customer: "+login);
            }
            return login;
        }
        catch (SQLException e) {
            error("Error in findByPrimaryKey for "+login,e);
        }
        finally {
            closeConnection(con, stmt, rs);
        }
        return null;
    }

    public Collection ejbFindAll() throws FinderException {
        Connection con = null;
        PreparedStatement stmt = null;
        ResultSet rs = null;
        try {
            con = dataSource.getConnection();
            stmt = con.prepareStatement(
            "SELECT login FROM Customer ORDER BY login");

            rs = stmt.executeQuery();

            Collection col = new ArrayList();
            while (rs.next()) {
                col.add(rs.getString(1));
            }
            return col;
        }
        catch (SQLException e) {
            error("Error in findAll",e);
        }
        finally {
            closeConnection(con, stmt, rs);
        }
        return null;
    }

    public void ejbLoad(){
        login = (String)ctx.getPrimaryKey();
        Connection con = null;
        PreparedStatement stmt = null;
        ResultSet rs = null;
        try {
            con = dataSource.getConnection();
            stmt = con.prepareStatement(
            "SELECT login,name,email,address1,address2 FROM Customer WHERE login = ?");

            stmt.setString(1, login);
            rs = stmt.executeQuery();

            if (!rs.next()) {
                error("No data found in ejbLoad for "+login,null);
            }
            this.login = rs.getString(1);
            this.name = rs.getString(2);
            this.email = rs.getString(3);
            this.address[0] = rs.getString(4);
            this.address[1] = rs.getString(5);
        }
        catch (SQLException e) {
            error("Error in ejbLoad for "+name,e);
        }
        finally {
            closeConnection(con, stmt, rs);
        }
    }

    public void ejbStore(){
        Connection con = null;
        PreparedStatement stmt = null;
        try {
            con = dataSource.getConnection();
            stmt = con.prepareStatement(
            "UPDATE Customer SET name = ?, email = ?, address1 = ?, address2 = ? WHERE login = ?");

            stmt.setString(1, name);
            stmt.setString(2, email);
            stmt.setString(3, address[0]);
            stmt.setString(4, address[1]);
            stmt.setString(5, login);
            stmt.executeUpdate();
        }
        catch (SQLException e) {
            error("Error in ejbStore for "+name,e);
        }
        finally {
            closeConnection(con, stmt, null);
        }
    }

    public void ejbPassivate(){
        login = null;
        name = null;
        email = null;
        address[0] = null;
        address[1] = null;
    }

    public void ejbActivate(){
    }

    public void ejbRemove(){
        login = (String)ctx.getPrimaryKey();

        // remove the customer's jobs.
        jobHome.deleteByCustomer(login);

        Connection con = null;
        PreparedStatement stmt = null;
        try {
            con = dataSource.getConnection();

            stmt = con.prepareStatement(
            "DELETE FROM Customer WHERE login = ?");

            stmt.setString(1, login);
            stmt.executeUpdate();
        }
        catch (SQLException e) {
            error("Error removing customer "+login,e);
        }
        finally {
            closeConnection(con, stmt, null);
        }
        login = null;
        name = null;
        email = null;
        address[0] = null;
        address[1] = null;
    }

    private EntityContext ctx;

    public void setEntityContext(EntityContext ctx) {
        this.ctx = ctx;
        InitialContext ic = null;
        try {
            ic = new InitialContext();
            dataSource = (DataSource)ic.lookup("java:comp/env/jdbc/Agency");
            jobHome = (JobLocalHome)ic.lookup("java:comp/env/ejb/JobLocal");
        }
        catch (NamingException ex) {
            error("Error looking up depended EJB or resource",ex);
            return;
        }
    }

    public void unsetEntityContext() {
        this.ctx = null;
        dataSource = null;
    }

    private void closeConnection (Connection con, PreparedStatement stmt, ResultSet rslt) {
        if (rslt != null) {
            try {
                rslt.close();
            }
            catch (SQLException e) {}
        }
        if (stmt != null) {
            try {
                stmt.close();
            }
            catch (SQLException e) {}
        }
        if (con != null) {
            try {
                con.close();
            }
            catch (SQLException e) {}
        }
    }

    private void error (String msg, Exception ex) {
        String s = "CustomerBean: "+msg + "\n" + ex;
        System.out.println(s);
        throw new EJBException(s,ex);
    }

}