matchedbean.java

21天学通J2EE的例子4

package data;

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

public class MatchedBean implements EntityBean
{
	private DataSource dataSource;
	private String job;
	private String customer;
	private String applicant;
	private boolean exact;

	public String getJob () {
		return job;
	}

	public String getCustomer () {
		return customer;
	}

	public String getApplicant () {
		return applicant;
	}

	public boolean getExact () {
		return exact;
	}

	public void setExact(boolean exact) {
		this.exact = exact;
	}

	// EJB methods start here

	public void ejbPostCreate (String applicant, String job, String customer, boolean exact) {}

	public MatchedPK ejbCreate (String applicant, String job, String customer, boolean exact) throws CreateException {
		MatchedPK key = new MatchedPK(applicant,job,customer);
		try {
			ejbFindByPrimaryKey(key);
			throw new CreateException("Duplicate matched entry: "+key);
		}
		catch (FinderException ex) {}
		
		Connection con = null;
		PreparedStatement stmt = null;
		try {
			con = dataSource.getConnection();
			stmt = con.prepareStatement(
			"INSERT INTO Matched (applicant,job,customer,exact) VALUES (?,?,?,?)");

			stmt.setString(1, applicant);
			stmt.setString(2, job);
			stmt.setString(3, customer);
			stmt.setBoolean(4, exact);
			stmt.executeUpdate();
		}
		catch (SQLException e) {
			error("Error creating matched entry "+key,e);
		}
		finally {
			closeConnection(con, stmt, null);
		}
		this.applicant = applicant;
		this.job = job;
		this.customer = customer;
		this.exact = exact;
		return key;
	}
	
	public MatchedPK ejbFindByPrimaryKey(MatchedPK key) throws FinderException {
		Connection con = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		try {
			con = dataSource.getConnection();
			stmt = con.prepareStatement(
			"SELECT exact FROM Matched WHERE applicant = ? AND job = ? AND customer = ?");

			stmt.setString(1, key.getApplicant());
			stmt.setString(2, key.getJob());
			stmt.setString(3, key.getCustomer());
			rs = stmt.executeQuery();

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

	public void ejbHomeDeleteByJob(String job, String customer) {
		Connection con = null;
		PreparedStatement stmt = null;
		try {
			con = dataSource.getConnection();

			stmt = con.prepareStatement(
			"DELETE FROM Matched WHERE job = ? and customer = ?");

			stmt.setString(1, job);
			stmt.setString(2, customer);
			stmt.executeUpdate();
		}
		catch (SQLException e) {
			error("Error removing all matched job lines "+job+":"+customer,e);
		}
		finally {
			closeConnection(con, stmt, null);
		}
	}

	public void ejbHomeDeleteByCustomer(String customer) {
		Connection con = null;
		PreparedStatement stmt = null;
		try {
			con = dataSource.getConnection();

			stmt = con.prepareStatement(
			"DELETE FROM Matched WHERE customer = ?");

			stmt.setString(1, customer);
			stmt.executeUpdate();
		}
		catch (SQLException e) {
			error("Error removing all customer matched entries "+customer,e);
		}
		finally {
			closeConnection(con, stmt, null);
		}
	}

	public void ejbHomeDeleteByApplicant(String applicant) {
		Connection con = null;
		PreparedStatement stmt = null;
		try {
			con = dataSource.getConnection();

			stmt = con.prepareStatement(
			"DELETE FROM Matched WHERE applicant = ?");

			stmt.setString(1, applicant);
			stmt.executeUpdate();
		}
		catch (SQLException e) {
			error("Error removing all applicant matched entries "+applicant,e);
		}
		finally {
			closeConnection(con, stmt, null);
		}
	}

	public void ejbLoad(){
		MatchedPK key= (MatchedPK)ctx.getPrimaryKey();
		Connection con = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		try {
			con = dataSource.getConnection();
			stmt = con.prepareStatement(
			"SELECT exact FROM Matched WHERE applicant = ? AND job = ? AND customer = ?");

			stmt.setString(1, key.getApplicant());
			stmt.setString(2, key.getJob());
			stmt.setString(3, key.getCustomer());
			rs = stmt.executeQuery();

			if (!rs.next()) {
				error("No data found in ejbLoad for "+key,null);
			}
			this.applicant = key.getApplicant();
			this.job = key.getJob();
			this.customer = key.getCustomer();
			this.exact = rs.getBoolean(1);
		}
		catch (SQLException e) {
			error("Error in ejbLoad for "+key,e);
		}
		finally {
			closeConnection(con, stmt, rs);
		}
	}

	public void ejbStore(){
		Connection con = null;
		PreparedStatement stmt = null;
		try {
			con = dataSource.getConnection();
			stmt = con.prepareStatement(
			"UPDATE Matched SET exact = ? WHERE applicant = ? AND job = ? AND customer = ?");

			stmt.setBoolean(1, this.exact);
			stmt.setString(2, this.applicant);
			stmt.setString(3, this.job);
			stmt.setString(4, this.customer);
			stmt.executeUpdate();
		}
		catch (SQLException e) {
			error("Error in ejbStore for "+ctx.getPrimaryKey(),e);
		}
		finally {
			closeConnection(con, stmt, null);
		}
	}

	public void ejbPassivate(){
		applicant = null;
		job = null;
		customer = null;
		exact = false;
	}

	public void ejbActivate(){
	}

	public void ejbRemove(){
		MatchedPK key = (MatchedPK)ctx.getPrimaryKey();

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

			stmt = con.prepareStatement(
			"DELETE FROM Matched WHERE applicant = ? AND job = ? AND customer = ?");

			stmt.setString(1, key.getApplicant());
			stmt.setString(2, key.getJob());
			stmt.setString(3, key.getCustomer());
			stmt.executeUpdate();
		}
		catch (SQLException e) {
			error("Error removing matched entry "+key,e);
		}
		finally {
			closeConnection(con, stmt, null);
		}
		applicant = null;
		job = null;
		customer = null;
		exact = false;
	}

	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");
		}
		catch (NamingException ex) {
			error("Error connecting to java:comp/env/jdbc/Agency:",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 = "MatchedBean: "+msg + "\n" + ex;
		System.out.println(s);
		throw new EJBException(s,ex);
	}
	
}