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Colleges.java
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Colleges.java
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import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Colleges extends HttpServlet
{
private ConnectionPool pool;
private ServletContext context;
private static String servletName="Colleges";
public void init()
{
context = getServletContext();
synchronized(context)
{
pool=(ConnectionPool)context.getAttribute("pool");
if(pool==null)
{
String driverClassName = context.getInitParameter("driverClassName");
String url = context.getInitParameter("url");
String userName = context.getInitParameter("username");
String password = context.getInitParameter("password");
try
{
pool=new ConnectionPool(driverClassName,url,userName,password);
}
catch(Exception error)
{
Routines.writeToLog(servletName,"Unable to create connection pool : " + error,false,context);
}
context.setAttribute("pool",pool);
}
}
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
{
doGet(request,response);
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
{
response.setContentType("text/html");
PrintWriter webPageOutput=null;
try
{
webPageOutput=response.getWriter();
}
catch(IOException error)
{
Routines.writeToLog(servletName,"Error getting writer : " + error,false,context);
}
HttpSession session=request.getSession();
String action=request.getParameter("action");
String disabledText="";
if("New College".equals(action)||
"Change College".equals(action))
{
disabledText=" DISABLED";
}
else
{
session.setAttribute("redirect",request.getRequestURL() + "?" + request.getQueryString());
}
Connection database=null;
try
{
database=pool.getConnection(servletName);
}
catch(SQLException error)
{
Routines.writeToLog(servletName,"Unable to connect to database : " + error,false,context);
}
if(Routines.loginCheck(true,request,response,database,context))
{
return;
}
Routines.WriteHTMLHead("Colleges",//title
false,//showMenu
11,//menuHighLight
false,//seasonsMenu
false,//weeksMenu
false,//scores
false,//standings
false,//gameCenter
false,//schedules
false,//previews
false,//teamCenter
false,//draft
database,//database
request,//request
response,//response
webPageOutput,//webPageOutput
context);//context
int collegeNumber=0;
webPageOutput.println("<CENTER>");
webPageOutput.println("<IMG SRC=\"../Images/EnterData.gif\"" +
" WIDTH='256' HEIGHT='40' ALT='Enter Data'>");
webPageOutput.println("</CENTER>");
if("Change College".equals(action))
{
boolean changeRequested=false;
int changeCount=0;
try
{
Statement sql=database.createStatement();
ResultSet queryResult;
queryResult=sql.executeQuery("SELECT CollegeNumber " +
"FROM colleges");
while(queryResult.next())
{
collegeNumber=queryResult.getInt(1);
if("true".equals(request.getParameter(String.valueOf(collegeNumber))))
{
changeCount++;
if(!changeRequested)
{
changeRequested=true;
}
}
}
}
catch(SQLException error)
{
Routines.writeToLog(servletName,"Unable to find college entries : " + error,false,context);
}
if(!changeRequested)
{
session.setAttribute("message","No college selected");
disabledText="";
action="";
}
if(changeCount>1)
{
session.setAttribute("message","Please select only one college to change");
disabledText="";
action="";
}
}
webPageOutput.println("<FORM ACTION=\"http://" +
request.getServerName() +
":" +
request.getServerPort() +
request.getContextPath() +
"/servlet/Colleges\" METHOD=\"POST\">");
if("New College".equals(action)||
"Change College".equals(action))
{
formScreen(action,
database,
session,
request,
webPageOutput);
}
else
{
viewScreen(action,
session,
database,
request,
response,
webPageOutput);
}
pool.returnConnection(database);
Routines.WriteHTMLTail(request,response,webPageOutput);
}
private void viewScreen(String action,
HttpSession session,
Connection database,
HttpServletRequest request,
HttpServletResponse response,
PrintWriter webPageOutput)
{
boolean updated=true;
int collegeNumber=0;
if ("Store New College".equals(action)||
"Store Changed College".equals(action)||
"Delete College".equals(action))
{
updated=updateEntry(action,
session,
request,
database);
}
if((String)session.getAttribute("message")!=null)
{
Routines.tableStart(false,webPageOutput);
Routines.tableHeader("Messages",0,webPageOutput);
Routines.tableDataStart(true,false,true,true,false,0,0,"scoresrow",webPageOutput);
Routines.messageCheck(false,request,webPageOutput);
Routines.tableDataEnd(true,false,true,webPageOutput);
Routines.tableEnd(webPageOutput);
webPageOutput.println(Routines.spaceLines(1));
}
Routines.tableStart(false,webPageOutput);
Routines.tableHeader("Colleges",2,webPageOutput);
boolean collegesFound=false;
try
{
Statement sql=database.createStatement();
ResultSet queryResult;
queryResult=sql.executeQuery("SELECT CollegeNumber,CollegeName " +
"FROM colleges " +
"ORDER BY CollegeName ASC");
collegeNumber=0;
String collegeName="";
while(queryResult.next())
{
if(!collegesFound)
{
collegesFound=true;
}
collegeNumber=queryResult.getInt(1);
collegeName=queryResult.getString(2);
Routines.tableDataStart(true,false,false,true,false,5,0,"scoresrow",webPageOutput);
boolean selected=false;
String param="";
if(!updated)
{
param=request.getParameter(String.valueOf(collegeNumber));
if("true".equals(param))
{
selected=true;
}
}
webPageOutput.print("<INPUT TYPE=\"CHECKBOX\" NAME=\"" + collegeNumber + "\" VALUE=\"true\"");
if(selected)
{
webPageOutput.print(" CHECKED");
}
webPageOutput.println(">");
Routines.tableDataEnd(false,false,false,webPageOutput);
Routines.tableDataStart(true,false,false,false,false,95,0,"scoresrow",webPageOutput);
webPageOutput.println(collegeName);
Routines.tableDataEnd(false,false,true,webPageOutput);
}
}
catch(SQLException error)
{
Routines.writeToLog(servletName,"Unable to retrieve colleges : " + error,false,context);
}
if(!collegesFound)
{
Routines.tableDataStart(true,true,false,true,false,0,0,"scoresrow",webPageOutput);
webPageOutput.println("No Colleges found.");
Routines.tableDataEnd(false,false,true,webPageOutput);
}
Routines.tableEnd(webPageOutput);
webPageOutput.println(Routines.spaceLines(1));
Routines.tableStart(false,webPageOutput);
Routines.tableHeader("Actions",0,webPageOutput);
Routines.tableDataStart(true,true,true,true,false,0,0,"scoresrow",webPageOutput);
webPageOutput.println("<INPUT TYPE=\"SUBMIT\" VALUE=\"New College\" NAME=\"action\">");
if(collegesFound)
{
webPageOutput.println("<INPUT TYPE=\"SUBMIT\" VALUE=\"Change College\" NAME=\"action\">");
webPageOutput.println("<INPUT TYPE=\"SUBMIT\" VALUE=\"Delete College\" NAME=\"action\">");
}
webPageOutput.println("<INPUT TYPE=\"hidden\" NAME=\"jsessionid\" VALUE=\"" + session.getId() + "\">");
webPageOutput.println("</FORM>");
Routines.tableDataEnd(true,false,true,webPageOutput);
Routines.tableEnd(webPageOutput);
webPageOutput.println(Routines.spaceLines(1));
}
private void formScreen(String action,
Connection database,
HttpSession session,
HttpServletRequest request,
PrintWriter webPageOutput)
{
int collegeNumber=0;
String collegeName="";
Routines.tableStart(false,webPageOutput);
if("Change College".equals(action))
{
try
{
Statement sql=database.createStatement();
ResultSet queryResult;
queryResult=sql.executeQuery("SELECT CollegeNumber " +
"FROM colleges");
int tempCollegeNumber=0;
while(queryResult.next())
{
tempCollegeNumber=queryResult.getInt(1);
int currentSequence=0;
if("true".equals(request.getParameter(String.valueOf(tempCollegeNumber))))
{
queryResult=sql.executeQuery("SELECT CollegeNumber,CollegeName " +
"FROM colleges " +
"WHERE CollegeNumber=" + tempCollegeNumber);
if(queryResult.first())
{
collegeNumber=queryResult.getInt(1);
collegeName=queryResult.getString(2);
}
else
{
Routines.writeToLog(servletName,"Unable to find college (" + tempCollegeNumber + ")",false,context);
}
}
}
}
catch(SQLException error)
{
Routines.writeToLog(servletName,"Unable to retrieve colleges : " + error,false,context);
}
Routines.tableHeader("Amend details of College",2,webPageOutput);
}
if("New College".equals(action))
{
Routines.tableHeader("Enter details of new College",2,webPageOutput);
}
Routines.tableDataStart(true,false,false,true,false,5,0,"scoresrow",webPageOutput);
webPageOutput.print("Name");
Routines.tableDataEnd(false,false,false,webPageOutput);
Routines.tableDataStart(true,false,false,false,false,75,0,"scoresrow",webPageOutput);
webPageOutput.print("<INPUT TYPE=\"TEXT\" NAME=\"collegeName\" SIZE=\"20\" MAXLENGTH=\"20\" VALUE=\"" + collegeName + "\">");
Routines.tableDataEnd(false,false,true,webPageOutput);
Routines.tableEnd(webPageOutput);
webPageOutput.println(Routines.spaceLines(1));
Routines.tableStart(false,webPageOutput);
Routines.tableHeader("Actions",1,webPageOutput);
Routines.tableDataStart(true,true,false,true,false,0,0,"scoresrow",webPageOutput);
if("New College".equals(action))
{
webPageOutput.println("<INPUT TYPE=\"SUBMIT\" VALUE=\"Store New College\" NAME=\"action\">");
}
else
{
webPageOutput.println("<INPUT TYPE=\"SUBMIT\" VALUE=\"Store Changed College\" NAME=\"action\">");
}
webPageOutput.println("<INPUT TYPE=\"SUBMIT\" VALUE=\"Cancel\" NAME=\"action\">");
Routines.tableDataEnd(false,false,true,webPageOutput);
Routines.tableEnd(webPageOutput);
webPageOutput.println("<INPUT TYPE=\"hidden\" NAME=\"jsessionid\" VALUE=\"" + session.getId() + "\">");
webPageOutput.println("<INPUT TYPE=\"hidden\" NAME=\"collegeNumber\" VALUE=\"" + collegeNumber + "\">");
webPageOutput.println("</FORM>");
}
private synchronized boolean updateEntry(String action,
HttpSession session,
HttpServletRequest request,
Connection database)
{
boolean success=false;
int collegeNumber=Routines.safeParseInt(request.getParameter("collegeNumber"));
int sequence=0;
String collegeName=request.getParameter("collegeName");
if("Store New College".equals(action))
{
try
{
int updates=0;
Statement sql=database.createStatement();
ResultSet queryResult;
updates=sql.executeUpdate("INSERT INTO colleges (" +
"CollegeNumber,CollegeName,DateTimeStamp) " +
"VALUES (" +
collegeNumber + ",\"" +
collegeName + "\",'" +
Routines.getDateTime(false) + "')");
if(updates!=1)
{
Routines.writeToLog(servletName,"New college not created, reason unknown",false,context);
}
}
catch(SQLException error)
{
Routines.writeToLog(servletName,"Unable to create colleges : " + error,false,context);
}
session.setAttribute("message",collegeName + " college stored successfully");
success=true;
}
if("Store Changed College".equals(action))
{
try
{
int updates=0;
Statement sql=database.createStatement();
ResultSet queryResult;
updates=sql.executeUpdate("UPDATE colleges " +
"SET CollegeName='" + collegeName + "'," +
"DateTimeStamp='" +
Routines.getDateTime(false) + "' " +
"WHERE CollegeNumber=" + collegeNumber);
if(updates!=1)
{
Routines.writeToLog(servletName,"College not updated, reason unknown",false,context);
}
}
catch(SQLException error)
{
Routines.writeToLog(servletName,"Unable to update colleges : " + error,false,context);
}
session.setAttribute("message",collegeName + " college changed successfully");
success=true;
}
if("Delete College".equals(action))
{
boolean deleteRequested=false;
try
{
int updates=0;
Statement sql1=database.createStatement();
Statement sql2=database.createStatement();
ResultSet queryResult1;
ResultSet queryResult2;
queryResult1=sql1.executeQuery("SELECT CollegeNumber " +
"FROM colleges");
while(queryResult1.next())
{
collegeNumber=queryResult1.getInt(1);
if("true".equals(request.getParameter(String.valueOf(collegeNumber))))
{
deleteRequested=true;
updates=sql2.executeUpdate("DELETE FROM colleges " +
"WHERE CollegeNumber=" + collegeNumber);
if(updates!=1)
{
Routines.writeToLog(servletName,"College not deleted (" + collegeNumber + ")",false,context);
}
}
}
}
catch(SQLException error)
{
Routines.writeToLog(servletName,"Unable to delete colleges : " + error,false,context);
}
if(deleteRequested)
{
session.setAttribute("message","Delete successfull");
}
else
{
session.setAttribute("message","No college selected");
}
success=true;
}
return success;
}
}