taskdaoimpl.java~

J2EE & Tomcat books published by hope

/*
 */

package com.sun.j2ee.workflow.task.dao;

import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import java.util.ArrayList;
import java.util.Iterator;

import javax.sql.DataSource;
import javax.naming.InitialContext;
import javax.naming.Context;
import javax.naming.NamingException;

import com.sun.j2ee.workflow.util.JNDINames;
import com.sun.j2ee.workflow.task.dao.TaskDAO;
import com.sun.j2ee.workflow.util.DatabaseNames;
import com.sun.j2ee.workflow.task.model.TaskModel;

import com.sun.j2ee.workflow.task.exceptions.TaskDAOSysException;
import com.sun.j2ee.workflow.task.exceptions.TaskDAOAppException;
import com.sun.j2ee.workflow.task.exceptions.TaskDAODBUpdateException;
import com.sun.j2ee.workflow.task.exceptions.TaskDAOFinderException;
import com.sun.j2ee.workflow.task.exceptions.TaskDAODupKeyException;

import com.sun.j2ee.workflow.util.Debug;

/**
 * This class calls the simple Datasource from Tomcat to get connection
 * No connection pooling is used.
 */
public class TaskDAOImpl implements TaskDAO {

    private transient Connection dbConnection = null;
    private transient DataSource datasource   = null;

    public TaskDAOImpl() throws TaskDAOSysException {
        try {
            InitialContext ic = new InitialContext();
            datasource = (DataSource) ic.lookup(JNDINames.WORKFLOW_DATASOURCE);
        } catch (NamingException ne) {
            throw new TaskDAOSysException("Naming Exception while looking "
                                             + " up DataSource Connection " +
                                                JNDINames.WORKFLOW_DATASOURCE +
                                                    ": \n" + ne.getMessage());
        }
    }
/*
    public void query{
        
        // load the PoolMan JDBC Driver
        try {
            Class.forName("com.codestudio.sql.PoolMan").newInstance();
        } catch (Exception ex) {
            System.out.println("Could Not Find the PoolMan Driver. " +
                               "Is poolman.jar in your CLASSPATH?");
            System.exit(0);
        }

        // establish a Connection to the last database listed in the 'poolman.props' file
        Connection con = DriverManager.getConnection("jdbc:poolman");

        try {

            Statement s = con.createStatement();
            ResultSet res = s.executeQuery(sql);
            ResultSetMetaData meta = res.getMetaData();

            int cols = meta.getColumnCount();
            while (res.next()) {
                for (int i = 1; i <= cols; i++) {
                    Object val = res.getObject(i);
                    System.out.print("\t" + meta.getColumnLabel(i) + ": ");
                    System.out.print(val == null ? " " : val.toString());
                }
                System.out.print("\n");
            }
        } catch (SQLException sqe) {
        }
        finally {
            // this close method merely returns the Connection to the pool
            // after implicitly closing related resources (Statements and ResultSets)
            con.close();
            System.out.println("SAMPLE: Closed Con");
        }


    }
 */
    public void create(TaskModel taskinfo) throws TaskDAOSysException,
                                TaskDAODupKeyException,
                                TaskDAODBUpdateException,
                                TaskDAOAppException {
        inserttask(taskinfo);
    }

    public TaskModel load(String id) throws TaskDAOSysException,
                              TaskDAOFinderException {
        return(selecttask(id));
    }

    public void store(TaskModel taskinfo) throws TaskDAODBUpdateException,
                               TaskDAOAppException,
                               TaskDAOSysException  {
        updatetask(taskinfo);
    }

    public void remove(String id) throws TaskDAODBUpdateException,
                                TaskDAOSysException {
        deletetask(id);
    }

    public String findByPrimaryKey(String taskId) throws
                                            TaskDAOFinderException,
                                            TaskDAOSysException {
        if (taskExists(taskId))
            return (taskId);
        throw new TaskDAOFinderException("primary key not found :"+taskId);
    }

    private boolean taskExists (String taskId) throws TaskDAOSysException {
        PreparedStatement stmt = null;
        ResultSet result = null;
        boolean returnValue = false;
        String queryStr ="SELECT task_ID FROM " +
                    DatabaseNames.TASK_TABLE
                        + " WHERE task_ID = " + "'" + taskId.trim() + "'";
        Debug.println("queryString is: "+ queryStr);

        try {
            getDBConnection();
            stmt = createPreparedStatement(dbConnection, queryStr);
            result = stmt.executeQuery();
            if ( !result.next() ) {
                returnValue = false;
            } else {
                taskId = result.getString(1);
                returnValue = true;
            }
        } catch(SQLException se) {
            throw new TaskDAOSysException(
                           "SQLException while checking for an"
                           + " existing task - id -> " + taskId + " :\n" + se);
        } finally {
            closeResultSet(result);
            closeStatement(stmt);
            closeConnection();
        }
        return returnValue;
    }

    private boolean isValidData(TaskModel taskinfo) {
        if ( (taskinfo.getTask_ID() == null) ||
             (taskinfo.getTask_name() == null) || 
             (taskinfo.getProject() == null) )
            return (false);
        else
            return (true);
    }

    private void inserttask(TaskModel taskinfo) throws
                                 TaskDAOSysException,
                                 TaskDAODupKeyException,
                                 TaskDAODBUpdateException,
                                 TaskDAOAppException {

        if (!isValidData(taskinfo))
            throw new TaskDAOAppException("Illegal data values for insert");
        if (taskExists(taskinfo.getTask_ID()))
            throw new TaskDAODupKeyException("task exists for "+
                                                taskinfo.getTask_ID());

        PreparedStatement stmt = null;
        String queryStr = "INSERT INTO " + DatabaseNames.TASK_TABLE + "VALUES ("
            + "'" + taskinfo.getTask_ID().trim() + "',"
            + "'" + taskinfo.getTask_name().trim() + "',"
            + "'" + taskinfo.getPlan_start_dt().toString() + "',"
            + "'" + taskinfo.getPlan_end_dt().toString() + "',"
            + "'" + taskinfo.getAct_start_dt().toString() + "',"
            + "'" + taskinfo.getAct_end_dt().toString() + "',"
            + "'" + taskinfo.getStatus().trim() + "',"
            + "'" + taskinfo.getPredecessor().trim() + "',"
            + "'" + taskinfo.getProject().trim() + "',"
            + "'" + taskinfo.getTask_desc().trim() + "',"
            + "'" + taskinfo.getType().trim() + "',"
            + "'" + taskinfo.getComment().trim() + "'";

 
        Debug.println("queryString is: "+ queryStr);

        try {
            getDBConnection();
            stmt = createPreparedStatement(dbConnection, queryStr);
            int resultCount = stmt.executeUpdate();

            if ( resultCount != 1 ) {
                throw new TaskDAODBUpdateException(
                    "ERROR in TASK_TABLE INSERT !! resultCount = " +
                                   resultCount);
            }
        } catch(SQLException ae) {
            throw new TaskDAOSysException(
                        "SQLException while inserting new " +
                        "task; id = " + taskinfo.getTask_ID() + " :\n" + ae);
        } finally {
            closeStatement(stmt);