FLASHBACK QUERY - Range based - Doubt - Help needed -URGENT
Hi,
I want to user the flashback query facility to capture the history of versions for a day (i.e) i want to get the data versions from morning 10 a.m to 6.pm.
How to get the versions by using the time range for a day.
I used the query as
select a.eno,
b.eno,
a.ename,
b.ename
from emp a, emp as of timestamp
to_timestamp('08-NOV-2006 06:32:21.999999 AM','DD-MON-RRRR HH:MI:SS.ff6 AM') b
where a.eno=b.eno
The above query will fetch only one versions for the specified timestamp.
How could i implement the range based search through flashback query.
Please suggest any methods to implement the same.
Thanks in advance.
You'll want to read the documentation about Oracle Flashback Version Query.<br><br>
Regards,
Rob.
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SQL> SELECT * FROM TABLE( dbms_xplan.display );
PLAN_TABLE_OUTPUT
Plan hash value: 178181731
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)|
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PLAN_TABLE_OUTPUT
| 0 | SELECT STATEMENT | | 24M| 3790M| | 1006K (2)|
03:21:17 |
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03:21:17 |
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00:24:41 |
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PLAN_TABLE_OUTPUT
Plan hash value: 178181731
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)|
Time |
PLAN_TABLE_OUTPUT
| 0 | SELECT STATEMENT | | 24M| 3790M| | 1006K (2)|
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| 2 | TABLE ACCESS FULL| RM_BIL_BILL | 24M| 3790M| | 123K (5)|
00:24:41 |
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Name Null? Type
BILL_ID NOT NULL NUMBER(14)
STUDENT_ID NOT NULL NUMBER(14)
STUDENT_UIN NOT NULL VARCHAR2(20)
BILL_MONTH NOT NULL DATE
BILL_TYPE NOT NULL VARCHAR2(10)
SCHOOL_CODE NOT NULL VARCHAR2(10)
LEVEL_GRADE NOT NULL VARCHAR2(10)
CLASS_NAME VARCHAR2(10)
PUPIL_PROFILE_ID NOT NULL NUMBER(14)
BAL_BROUGHT_FORWARD NOT NULL NUMBER(10,2)
BILL_TOTAL_PAYMENT NOT NULL NUMBER(10,2)
BILL_OUTSTANDING_BAL NOT NULL NUMBER(10,2)
BILL_NET_CHARGES NOT NULL NUMBER(10,2)
BILL_TOTAL_PAYABLE NOT NULL NUMBER(10,2)
GENERATION_DATE NOT NULL DATE
GIRO_SO_IND CHAR(1)
GIRO_DEDUCTION_IND CHAR(1)
GIRO_DEDUCTION_DATE DATE
PRINT_DATA_EXTRACTION_IND CHAR(1)
PRINT_DATA_EXTRACTION_DATE DATE
REVIEW_IND CHAR(1)
REVIEW_DATE DATE
REVERSAL_MONTH DATE
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CREATED_BY VARCHAR2(20)
CREATION_DATE DATE
LAST_UPDATED_BY VARCHAR2(20)
LAST_UPDATED_DATE DATE
BANK_ACCOUNT_NUMBER VARCHAR2(12)
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( "BILL_ID" NUMBER(14,0) NOT NULL ENABLE,
"STUDENT_ID" NUMBER(14,0) NOT NULL ENABLE,
"STUDENT_UIN" VARCHAR2(20) NOT NULL ENABLE,
"BILL_MONTH" DATE NOT NULL ENABLE,
"BILL_TYPE" VARCHAR2(10) NOT NULL ENABLE,
"SCHOOL_CODE" VARCHAR2(10) NOT NULL ENABLE,
"LEVEL_GRADE" VARCHAR2(10) NOT NULL ENABLE,
"CLASS_NAME" VARCHAR2(10),
"PUPIL_PROFILE_ID" NUMBER(14,0) NOT NULL ENABLE,
"BAL_BROUGHT_FORWARD" NUMBER(10,2) NOT NULL ENABLE,
"BILL_TOTAL_PAYMENT" NUMBER(10,2) NOT NULL ENABLE,
"BILL_OUTSTANDING_BAL" NUMBER(10,2) NOT NULL ENABLE,
"BILL_NET_CHARGES" NUMBER(10,2) NOT NULL ENABLE,
"BILL_TOTAL_PAYABLE" NUMBER(10,2) NOT NULL ENABLE,
"GENERATION_DATE" DATE NOT NULL ENABLE,
"GIRO_SO_IND" CHAR(1),
"GIRO_DEDUCTION_IND" CHAR(1),
"GIRO_DEDUCTION_DATE" DATE,
"PRINT_DATA_EXTRACTION_IND" CHAR(1),
"PRINT_DATA_EXTRACTION_DATE" DATE,
"REVIEW_IND" CHAR(1),
"REVIEW_DATE" DATE,
"REVERSAL_MONTH" DATE,
"VERSION_NO" NUMBER(6,0) DEFAULT 0 NOT NULL ENABLE,
"CREATED_BY" VARCHAR2(20),
"CREATION_DATE" DATE DEFAULT SYSDATE,
"LAST_UPDATED_BY" VARCHAR2(20),
"LAST_UPDATED_DATE" DATE DEFAULT SYSDATE,
"BANK_ACCOUNT_NUMBER" VARCHAR2(12),
"BANK_ACRONYM" VARCHAR2(30),
PRIMARY KEY ("BILL_ID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 NOLOGGING COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "DATAMEDIUM_RM_P" ENABLE
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STORAGE(INITIAL 4294967296 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
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A Java program is required that will produce a number of reports based on the data from the Product file. This file contains the product name, cost, quantity and UPC. The file name must be input. Valid data from the file will be loaded into an array.
A menu will provide the following options: (Note there are changes from previous assignment.)
1 Display of all valid product information including extended price and GST including totals sorted by name.
2 Display of all invalid records sorted by name.
3 Search and display a certain product by name.
4 Sort by UPC and use a binary search and display a certain product by UPC. (valid records)
9 Exit.
Processing requirements:
Input the data from a file and load the records into an object array. Use this object array to produce the above reports.
Code a class definition exactly as given in the following UML.
(For specific students: you may code the UPC as an integer but if not numeric throw an exception that is handled in main. Document your choice in your submission).
Product
? Name : String
? UPC : String
? Cost : Real
? Quantity : Integer
+ Product (Name : String, UPC : String, Cost : Real, Quantity : Integer)
+ Calculate Extended Cost() : Real
+ Calculate GST(): Real
Input Record:
Product name: String
UPC: String
Cost: real
Quantity: integer
Output Reports
1. Display of all product information including extended cost and GST including totals of these 3 fields.
Following is a sample of the output required:
************************ Product Cost REPORT ****************************
Product Cost Quantity Extended Cost GST Total Cost
Diamond Necklace 12345678901x 54,321.99 188 10,212,534.12 510,626.71 10,723,160.83
Tissues 98989898989x 1.99 2 3.98 0.20 4.18
TOTALS 10,212,538.10 510,626.91 10,723,165.01
2. Display of all invalid records and the count.
Following is a sample of the output required:
Invalid UPC Records = 1
Count Record
1 Tiara Diamond, 12345678901x, 36020.00, 2
3. Search and display a certain product by name. Display appropriate message if not found.
Following is a sample of the output required:
Enter product name: CrownJewels
CrownJewels 99999999991x 100,000.00 1 100,000.00 5,000.00 $105,000.00
6. Display the product information sorted by name
Following is a sample of the output required:
************************ Product Cost REPORT ****************************
Product Cost Quantity Extended Cost GST Total Cost
CrownJewels 99999999991x 100,000.00 1 100,000.00 5,000.00 $105,000.00
Diamond Necklace 12345678901x 54,321.99 188 10,212,534.12 510,626.71 $10,723,160.83
Pearls 88888888881x 10,000.00 1 10,000.00 500.00 $10,500.00
RubyRing 77777777771x 10,000.00 1 10,000.00 500.00 $10,500.00
Tissues 98989898989x 1.99 2 3.98 0.20 $4.18
TOTALS (complete these values) xxx xxx xxx
Java coding requirements for this assignment
Main methods required
1. Load array with all records. Display exception messages only for records that have invalid data in any of the fields. Return array of valid records and logical size.
2. Validate the UPC. Display each report when requested from the menu.
3. Justify the data in the columns. Right justify numeric fields; left justify the alpha fields.
4. A method for each report required in the menu.
Class methods
5. Use the object method for the extended cost.
6. Use the object method for the GST.
You may use additional methods in the main program but do not add any methods in the class definition.
Use DecimalFormat for rounding.
Create an array to hold the objects. Assume that we only need to process a file of a maximum of 500 records but the file may be larger than 500 records.
A Universal Product Code consists of 12 digits. The first digit (from the left) is the UPC type. The next five digits are the Manufacturer code. The next five digits are the product code which is assigned by the manufacturer. The final digit is the check digit. A person can determine the check digit of a Universal Product Code by doing the following:
Step 1: Sum all of the digits in the odd positions together.
0+4+0+1+5+9 = 19
Step 2: Multiply the sum from Step 1 by 3.
3 * 19 = 57
Step 3: Sum all of the digits in the even positions together.
6+2+0+1+8 = 17
Step 4: Sum together the results from Step 2 and Step 3.
17 + 57 = 74
Step 5: Subtract the sum from the next highest multiple of 10.
80 - 74 = 6 [check digit]
TEST DATA:
Step 1: Create 5 or MORE additional records that will test all conditions. Include these in your documentation. Identify what field is tested in your test data. (Example: error in each field of the record, rounding up, rounding down, valid UPC, invalid UPC, formatting of report, file too large
Step 2: Use the file attached.
GODDDDDDDDDDDDDD lol pasting it made me go crazy,
these are my codes so far, HOwever the problem is ONLY DISPLAY MENU SHOWS, nothing else even though i have enough codes that it can show something,
My codes are as follows:
I am working on Eclipse.
import java.util.Arrays;
import java.util.Scanner;
import java.io.*;
import java.util.*;
import java.io.IOException;
* Name : Sana Ghani
* Date : July 10
public class lab56
public static Scanner file;
public static Scanner parse;
public static Scanner input = new Scanner(System.in);
public static Scanner searchInput = new Scanner(System.in);
public static void main(String[] args) throws Exception
Product1[] validProduct = new Product1[500];
int logicalSize = 0;
int menuChoice=0;
String FileName = getFileName();
displayMenu();
switch(menuChoice)
case 1:
displayAllValidRecords(validProduct, logicalSize);
try
// Open an output stream
OutputStream fout = new FileOutputStream ("myfile.txt");
// Print a line of text
new PrintStream(fout).println ("hello world!");
// Close our output stream
fout.close();
// Catches any error conditions
catch (IOException e)
System.err.println ("Unable to write to file");
System.exit(-1);
break;
case 2:
break;
case 3:
binarySearchByName( validProduct,logicalSize);
break;
case 4:
break;
case 5:
break;
menuChoice = displayMenu();
public static void display(Product1[]validProduct, int logicalSize)throws Exception
String Product, UPC;
double Cost;
int Quantity;
for(int index =0; index<logicalSize; index++)
Product = validProduct[index].GetName();
UPC = validProduct[index].GetUPC();
Cost=validProduct[index].GetCost();
Quantity=validProduct[index].GetQuantity();
System.out.println(Product+"\t\t"+UPC+"\t\t"+Cost+"\t\t"+Quantity);
public static String getFileName()
String fileName;
Scanner input = new Scanner(System.in);
System.out.print("Please enter a file name: ");
fileName = input.next();
return fileName;
public static int displayMenu()
int menuChoice;
boolean validFlag = false;
do
System.out.println("\n\n*************************************");
System.out.println(" Product Display Menu ");
System.out.println("*************************************");
System.out.println("(1)Display All Records");
System.out.println("(2)Display All Invalid Records");
System.out.println("(3)Search by Product Name");
System.out.println("(4)Sort by Product Name");
System.out.println("(5)Exit");
System.out.println("*************************************");
System.out.print("Enter your choice(1-5): ");
menuChoice = input.nextInt();
if ((menuChoice >= 1) && (menuChoice <= 5))
validFlag = true;
if (!validFlag)
System.out.println("You have chosen " + menuChoice + ", " + menuChoice +
" is not valid. Please try again");
}while(!validFlag);
return menuChoice;
public static String loadArray(Product1 [] ValidProduct, String fileName)throws Exception
int logicalSize=0;//will always have to declare
String record;//will always have to declare
String Product, UPC;//variable names from
double Quantity;
double Cost;
Scanner file = new Scanner(new File(fileName));//open
record = file.nextLine();//read a line
record = file.nextLine();//read a line
for(int index = 0; index < ValidProduct.length && file.hasNext(); index++)//check to see if the file has data
record = file.nextLine();
parse = new Scanner(record).useDelimiter(",");
String Name = parse.next();
UPC = parse.next();
Cost = parse.nextDouble();
Quantity=parse.nextDouble();
ValidProduct[index] = new Product1 ( Name, UPC, Cost, (int) Quantity);
// create the object-- call the constructor and pass info
logicalSize++;
return logicalSize+".txt";
public static double roundDouble(double value, int position)
java.math.BigDecimal bd = new java.math.BigDecimal(value);
bd = bd.setScale(position,java.math.BigDecimal.ROUND_UP);
return bd.doubleValue();
* This method will print report about valid records
public static void displayAllRecords( Product1[]valid, int ValidProduct,
Product1[] invalid, int InvalidProduct)
// Print valid records
displayAllValidRecords(valid, ValidProduct);
// Print invalid UPC records
displayAllValidRecords(invalid, InvalidProduct);
public static void displayOneRecord(Product1[]valid, int index)
double extendedCost, GST, SumofGST = 0, // Total Extended Cost
totalCost, SumOfTotalCost = 0; // Total Extended Cost + GST
// Print title
System.out.println(leftJustify("Product", 50) +
leftJustify("UPC", 15) +
rightJustify("Cost", 10) +
rightJustify("Quantity", 5) +
rightJustify("Extended Cost", 15) +
rightJustify("GST", 5) +
rightJustify("Total Cost", 13));
extendedCost = valid[index].CalculateExtendedCost();
extendedCost = roundDouble(extendedCost, 2);
GST = valid[index].CalculateGST();
GST = roundDouble(GST, 2);
totalCost = extendedCost + GST;
totalCost = roundDouble(totalCost, 2);
// justify method ensures all values are of the same size
System.out.println(//leftJustify(i+"",3) + ": " +
leftJustify(valid[index].GetName(), 50) +
leftJustify(valid[index].GetUPC(), 15) +
rightJustify(valid[index].GetCost()+"", 10) +
rightJustify(valid[index].GetQuantity()+"", 5) +
rightJustify(extendedCost+"", 10) +
rightJustify(GST+"", 10) +
rightJustify(totalCost+"", 10));
* This method will print report about valid records
public static void displayAllValidRecords( Product1[]valid, int validCounter)
double extendedCost, sumOfExtendedCost = 0, // Total Extended Cost
GST, sumOfGST = 0, // Total GST
totalCost, sumOfTotalCost = 0; // Total Extended Cost + GST
System.out.println("************************ XYZ Product " +
"Cost REPORT ****************************" +
// Print title
System.out.println(leftJustify("Product", 50) +
leftJustify("UPC", 15) +
rightJustify("Cost", 10) +
rightJustify("Qty", 5) +
rightJustify("Extended Cost", 15) +
rightJustify("GST", 5) +
rightJustify("Total Cost", 13));
// Print Records
for(int i=0; i<validCounter; i++)
extendedCost = valid.CalculateExtendedCost();
extendedCost = roundDouble(extendedCost, 2);
GST = valid[i].CalculateGST();
GST = roundDouble(GST, 2);
totalCost = extendedCost + GST;
totalCost = roundDouble(totalCost, 2);
// justify method ensures all values are of the same size
System.out.println(//leftJustify(i+"",3) + ": " +
leftJustify(valid[i].GetName(), 50) +
leftJustify(valid[i].GetUPC(), 15) +
rightJustify(valid[i].getClass()+"", 10) +
rightJustify(valid[i].GetQuantity()+"", 5) +
rightJustify(extendedCost+"", 10) +
rightJustify(GST+"", 10) +
rightJustify(totalCost+"", 10));
sumOfExtendedCost += extendedCost;
sumOfGST += GST;
sumOfTotalCost += totalCost;
private static void sortByName(Product1 [] ValidProduct, int logicalSize) throws Exception
Product1 temp;
for (int outer = logicalSize-1; outer > 1; outer --)
for (int inner = 0; inner < outer; inner ++)
if (ValidProduct[inner].GetName().compareToIgnoreCase(ValidProduct[inner+1].GetName())>0)
temp = ValidProduct[inner];
ValidProduct[inner] = ValidProduct[inner + 1];
ValidProduct [+ 1] = temp;
public static void binarySearchByName(Product1 [] ValidProduct, int logicalSize)
int high = logicalSize - 1;
int low = 0;
int mid = 0;
int count = 0;
int compare = 0;
boolean found = false;
System.out.print("Enter a product name");
String product = input.nextLine();
while (high >= low && !found)
count += 1;
mid = (high + low) / 2;
compare = ValidProduct[mid].GetName().compareToIgnoreCase(product);
if (compare == 0)
System.out.println("Found: " + ValidProduct[mid].GetName());
found = true;
else if (compare < 0)
low = mid + 1;
else
high = mid - 1;
if (!found)
System.out.println(product + " not found.");
System.out.println(count + " steps");
System.out.println();
public static String leftJustify(String field, int width)
StringBuffer buffer = new StringBuffer(field);
while (buffer.length() < width)
buffer.append(' ');
return buffer.toString();
public static String rightJustify(String field, int width)
StringBuffer buffer = new StringBuffer(field);
while (buffer.length() < width)
buffer.append(' ');
return buffer.toString();
public static void displayValidRecords(Product1 [] ValidProduct, int logicalSize) throws Exception {
long longMAX_POSSIBLE_UPC_CODE = 999999999999L;
// set input stream and get number
Scanner stdin = new Scanner(System.in);
System.out.print("Enter a 12-digit UPC number: ");
long input =stdin.nextLong();
long number = input;
// determine whether number is a possible UPC code
if ((input < 0)|| (input > longMAX_POSSIBLE_UPC_CODE)) {
// not a UPC code
System.out.println(input +"is an invalid UPC code");
else {
// might be a UPC code
// determine digits
int d12 = (int) (number % 10);
number /= 10;
int d11 = (int) (number % 10);
number /= 10;
int d10 = (int) (number % 10);
number /= 10;
int d9 = (int) (number % 10);
number /= 10;
int d8 = (int) (number % 10);
number /= 10;
int d7 = (int) (number % 10);
number /= 10;
int d6 = (int) (number % 10);
number /= 10;
int d5 = (int) (number % 10);
number /= 10;
int d4 = (int) (number % 10);
number /= 10;
int d3 = (int) (number % 10);
number /= 10;
int d2 = (int) (number % 10);
number /= 10;
int d1 = (int) (number % 10);
number /= 10;
// compute sums of first 5 even digits and the odd digits
int m = d2 + d4 d6 d8 + d10;
int n = d1 + d3 d5 d7 + d9 + d11;
// use UPC formula to determine required value for d12
int r = 10 - ((m +3*n) % 10);
// based on r, can test whether number is a UPC code
if (r == d12) {
// is a UPCcode
System.out.println(input+" is a valid UPC code");
else {
// not a UPCcode
System.out.println(input+" is not valid UPC code");
Any help would be great thanks !!
Take care,1) It's your problem that you waited until the last minute before you went for help...not ours. We'll give your problem the same attention as anyone elses...therefore your problem isn't any more urgent than any other problem here.
2) I don't intend on doing your entire assignment. Nor do I intend on reading all of it. If you need help with a specific requirement, then post the information/code relevant to that requirement. I don't know how to help you when you bury the problem inside a 9 mile long essay.
3) Post code in tags so it's formatted and readable. (there's a *code* button up above that makes the tags for you). -
"com.mysql.jdbc.PacketTooBigException": Help needed urgently
hi,
I am using mm.mysql j/connector ver 3.0.6 and MYSQL server version 4.0.
Max_allowed packet= 8MB at the server side
I am getting PacketTooBigException when i am trying to update a particular column.
What should i do.
Any help will be greatly appreciated!!!the driver uses a 64 k max packet size by default. it is supposed to change this as neccessary upon connection but perhaps that is failing?
below is the 3.0.7 connection code that i have slightly modified for you so that it prints out the connection properties after they have been initialized so that you can see what they are.
try it out and i hope you find this helpful.
Copyright (C) 2002 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
/*Slight Modification by Max Stocker April 29, 2003 to trace what the connection values get initialized to. */
package com.mysql.jdbc;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.net.URL;
import java.sql.Clob;
import java.sql.Date;
import java.sql.ParameterMetaData;
import java.sql.Ref;
import java.sql.SQLException;
import java.sql.Savepoint;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.StringTokenizer;
import java.util.TimeZone;
* A Connection represents a session with a specific database. Within the
* context of a Connection, SQL statements are executed and results are
* returned.
* <P>A Connection's database is able to provide information describing
* its tables, its supported SQL grammar, its stored procedures, the
* capabilities of this connection, etc. This information is obtained
* with the getMetaData method.
* @see java.sql.Connection
* @author Mark Matthews
* @version $Id: Connection.java,v 1.31.2.19 2003/03/28 22:42:24 mmatthew Exp $
public class Connection implements java.sql.Connection {
// The command used to "ping" the database.
// Newer versions of MySQL server have a ping() command,
// but this works for everything
private static final String PING_COMMAND = "SELECT 1";
* Map mysql transaction isolation level name to
* java.sql.Connection.TRANSACTION_XXX
private static Map mapTransIsolationName2Value = null;
* The mapping between MySQL charset names
* and Java charset names.
* Initialized by loadCharacterSetMapping()
private static Map charsetMap;
* Table of multi-byte charsets.
* Initialized by loadCharacterSetMapping()
private static Map multibyteCharsetsMap;
* Default socket factory classname
private static final String DEFAULT_SOCKET_FACTORY = StandardSocketFactory.class
.getName();
static {
loadCharacterSetMapping();
mapTransIsolationName2Value = new HashMap(8);
mapTransIsolationName2Value.put("READ-UNCOMMITED",
new Integer(TRANSACTION_READ_UNCOMMITTED));
mapTransIsolationName2Value.put("READ-UNCOMMITTED",
new Integer(TRANSACTION_READ_UNCOMMITTED));
mapTransIsolationName2Value.put("READ-COMMITTED",
new Integer(TRANSACTION_READ_COMMITTED));
mapTransIsolationName2Value.put("REPEATABLE-READ",
new Integer(TRANSACTION_REPEATABLE_READ));
mapTransIsolationName2Value.put("SERIALIZABLE",
new Integer(TRANSACTION_SERIALIZABLE));
* Internal DBMD to use for various database-version
* specific features
private DatabaseMetaData dbmd = null;
* The list of host(s) to try and connect to
private List hostList = null;
* A map of statements that have had setMaxRows() called on them
private Map statementsUsingMaxRows;
* The I/O abstraction interface (network conn to
* MySQL server
private MysqlIO io = null;
* Mutex
private final Object mutex = new Object();
* The driver instance that created us
private NonRegisteringDriver myDriver;
* The map of server variables that we retrieve
* at connection init.
private Map serverVariables = null;
* Properties for this connection specified by user
private Properties props = null;
* The database we're currently using
* (called Catalog in JDBC terms).
private String database = null;
* If we're doing unicode character conversions,
* what encoding do we use?
private String encoding = null;
* The hostname we're connected to
private String host = null;
* The JDBC URL we're using
private String myURL = null;
* The password we used
private String password = null;
* Classname for socket factory
private String socketFactoryClassName = null;
* The user we're connected as
private String user = null;
* The timezone of the server
private TimeZone serverTimezone = null;
* Allow LOAD LOCAL INFILE (defaults to true)
private boolean allowLoadLocalInfile = true;
* Are we in autoCommit mode?
private boolean autoCommit = true;
* Should we capitalize mysql types
private boolean capitalizeDBMDTypes = false;
* Should we continue processing batch commands if
* one fails. The JDBC spec allows either way, so
* we let the user choose
private boolean continueBatchOnError = true;
* Should we do unicode character conversions?
private boolean doUnicode = false;
* Are we failed-over to a non-master host
private boolean failedOver = false;
/** Does the server suuport isolation levels? */
private boolean hasIsolationLevels = false;
* Does this version of MySQL support quoted identifiers?
private boolean hasQuotedIdentifiers = false;
// This is for the high availability :) routines
private boolean highAvailability = false;
* Has this connection been closed?
private boolean isClosed = true;
* Should we tell MySQL that we're an interactive client?
private boolean isInteractiveClient = false;
* Is the server configured to use lower-case
* table names only?
private boolean lowerCaseTableNames = false;
* Has the max-rows setting been changed from
* the default?
private boolean maxRowsChanged = false;
* Do we expose sensitive information in exception
* and error messages?
private boolean paranoid = false;
* Should we do 'extra' sanity checks?
private boolean pedantic = false;
* Are we in read-only mode?
private boolean readOnly = false;
/** Do we relax the autoCommit semantics? (For enhydra, for example) */
private boolean relaxAutoCommit = false;
* Do we need to correct endpoint rounding errors
private boolean strictFloatingPoint = false;
* Do we check all keys for updatable result sets?
private boolean strictUpdates = true;
/** Are transactions supported by the MySQL server we are connected to? */
private boolean transactionsSupported = false;
* Has ANSI_QUOTES been enabled on the server?
private boolean useAnsiQuotes = false;
* Should we use compression?
private boolean useCompression = false;
* Can we use the "ping" command rather than a
* query?
private boolean useFastPing = false;
* Should we tack on @hostname in DBMD.getTable/ColumnPrivileges()?
private boolean useHostsInPrivileges = true;
* Should we use SSL?
private boolean useSSL = false;
* Should we use stream lengths in prepared statements?
* (true by default == JDBC compliant)
private boolean useStreamLengthsInPrepStmts = true;
* Should we use timezone information?
private boolean useTimezone = false;
/** Should we return PreparedStatements for UltraDev's stupid bug? */
private boolean useUltraDevWorkAround = false;
private double initialTimeout = 2.0D;
* How many hosts are in the host list?
private int hostListSize = 0;
* isolation level
private int isolationLevel = java.sql.Connection.TRANSACTION_READ_COMMITTED;
* The largest packet we can send (changed
* once we know what the server supports, we
* get this at connection init).
private int maxAllowedPacket = 65536;
private int maxReconnects = 3;
* The max rows that a result set can contain.
* Defaults to -1, which according to the JDBC
* spec means "all".
private int maxRows = -1;
private int netBufferLength = 16384;
* The port number we're connected to
* (defaults to 3306)
private int port = 3306;
* How many queries should we wait before we try to re-connect
* to the master, when we are failing over to replicated hosts
* Defaults to 50
private int queriesBeforeRetryMaster = 50;
* What should we set the socket timeout to?
private int socketTimeout = 0; // infinite
* When did the last query finish?
private long lastQueryFinishedTime = 0;
* When did the master fail?
private long masterFailTimeMillis = 0L;
* Number of queries we've issued since the master
* failed
private long queriesIssuedFailedOver = 0;
* How many seconds should we wait before retrying to connect
* to the master if failed over? We fall back when either
* queriesBeforeRetryMaster or secondsBeforeRetryMaster is
* reached.
private long secondsBeforeRetryMaster = 30L;
* The type map for UDTs (not implemented, but used by
* some third-party vendors, most notably IBM WebSphere)
private Map typeMap;
* Ignore non-transactional table warning for rollback?
private boolean ignoreNonTxTables = false;
* Creates a connection to a MySQL Server.
* @param host the hostname of the database server
* @param port the port number the server is listening on
* @param info a Properties[] list holding the user and password
* @param database the database to connect to
* @param url the URL of the connection
* @param d the Driver instantation of the connection
* @exception java.sql.SQLException if a database access error occurs
Connection(String host, int port, Properties info, String database,
String url, NonRegisteringDriver d) throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = { host, new Integer(port), info, database, url, d };
Debug.methodCall(this, "constructor", args);
this.serverVariables = new HashMap();
hostList = new ArrayList();
if (host == null) {
this.host = "localhost";
hostList.add(this.host);
} else if (host.indexOf(",") != -1) {
// multiple hosts separated by commas (failover)
StringTokenizer hostTokenizer = new StringTokenizer(host, ",", false);
while (hostTokenizer.hasMoreTokens()) {
hostList.add(hostTokenizer.nextToken().trim());
} else {
this.host = host;
hostList.add(this.host);
hostListSize = hostList.size();
this.port = port;
if (database == null) {
throw new SQLException("Malformed URL '" + url + "'.", "S1000");
this.database = database;
this.myURL = url;
this.myDriver = d;
this.user = info.getProperty("user");
this.password = info.getProperty("password");
if ((this.user == null) || this.user.equals("")) {
this.user = "nobody";
if (this.password == null) {
this.password = "";
this.props = info;
initializeDriverProperties(info);
if (Driver.DEBUG) {
System.out.println("Connect: " + this.user + " to " + this.database);
try {
createNewIO(false);
this.dbmd = new DatabaseMetaData(this, this.database);
} catch (java.sql.SQLException ex) {
cleanup();
// don't clobber SQL exceptions
throw ex;
} catch (Exception ex) {
cleanup();
StringBuffer mesg = new StringBuffer();
if (!useParanoidErrorMessages()) {
mesg.append("Cannot connect to MySQL server on ");
mesg.append(this.host);
mesg.append(":");
mesg.append(this.port);
mesg.append(".\n\n");
mesg.append("Make sure that there is a MySQL server ");
mesg.append("running on the machine/port you are trying ");
mesg.append(
"to connect to and that the machine this software is "
+ "running on ");
mesg.append("is able to connect to this host/port "
+ "(i.e. not firewalled). ");
mesg.append(
"Also make sure that the server has not been started "
+ "with the --skip-networking ");
mesg.append("flag.\n\n");
} else {
mesg.append("Unable to connect to database.");
mesg.append("Underlying exception: \n\n");
mesg.append(ex.getClass().getName());
throw new java.sql.SQLException(mesg.toString(), "08S01");
* If a connection is in auto-commit mode, than all its SQL
* statements will be executed and committed as individual
* transactions. Otherwise, its SQL statements are grouped
* into transactions that are terminated by either commit()
* or rollback(). By default, new connections are in auto-
* commit mode. The commit occurs when the statement completes
* or the next execute occurs, whichever comes first. In the
* case of statements returning a ResultSet, the statement
* completes when the last row of the ResultSet has been retrieved
* or the ResultSet has been closed. In advanced cases, a single
* statement may return multiple results as well as output parameter
* values. Here the commit occurs when all results and output param
* values have been retrieved.
* <p><b>Note:</b> MySQL does not support transactions, so this
* method is a no-op.
* @param autoCommit - true enables auto-commit; false disables it
* @exception java.sql.SQLException if a database access error occurs
public void setAutoCommit(boolean autoCommit) throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = { new Boolean(autoCommit) };
Debug.methodCall(this, "setAutoCommit", args);
checkClosed();
if (this.transactionsSupported) {
// this internal value must be set first as failover depends on it
// being set to true to fail over (which is done by most
// app servers and connection pools at the end of
// a transaction), and the driver issues an implicit set
// based on this value when it (re)-connects to a server
// so the value holds across connections
this.autoCommit = autoCommit;
String sql = "SET autocommit=" + (autoCommit ? "1" : "0");
execSQL(sql, -1, this.database);
} else {
if ((autoCommit == false) && (this.relaxAutoCommit == false)) {
throw new SQLException("MySQL Versions Older than 3.23.15 "
+ "do not support transactions", "08003");
} else {
this.autoCommit = autoCommit;
return;
* gets the current auto-commit state
* @return Current state of the auto-commit mode
* @exception java.sql.SQLException (why?)
* @see setAutoCommit
public boolean getAutoCommit() throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = new Object[0];
Debug.methodCall(this, "getAutoCommit", args);
Debug.returnValue(this, "getAutoCommit",
new Boolean(this.autoCommit));
return this.autoCommit;
* A sub-space of this Connection's database may be selected by
* setting a catalog name. If the driver does not support catalogs,
* it will silently ignore this request
* <p><b>Note:</b> MySQL's notion of catalogs are individual databases.
* @param catalog the database for this connection to use
* @throws java.sql.SQLException if a database access error occurs
public void setCatalog(String catalog) throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = { catalog };
Debug.methodCall(this, "setCatalog", args);
checkClosed();
String quotedId = this.dbmd.getIdentifierQuoteString();
if ((quotedId == null) || quotedId.equals(" ")) {
quotedId = "";
StringBuffer query = new StringBuffer("USE ");
query.append(quotedId);
query.append(catalog);
query.append(quotedId);
execSQL(query.toString(), -1, catalog);
this.database = catalog;
* Return the connections current catalog name, or null if no
* catalog name is set, or we dont support catalogs.
* <p><b>Note:</b> MySQL's notion of catalogs are individual databases.
* @return the current catalog name or null
* @exception java.sql.SQLException if a database access error occurs
public String getCatalog() throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = new Object[0];
Debug.methodCall(this, "getCatalog", args);
Debug.returnValue(this, "getCatalog", this.database);
return this.database;
* DOCUMENT ME!
* @return DOCUMENT ME!
public boolean isClosed() {
if (Driver.TRACE) {
Object[] args = new Object[0];
Debug.methodCall(this, "isClosed", args);
Debug.returnValue(this, "isClosed", new Boolean(this.isClosed));
return this.isClosed;
* Returns the character encoding for this Connection
* @return the character encoding for this connection.
public String getEncoding() {
return this.encoding;
* @see Connection#setHoldability(int)
public void setHoldability(int arg0) throws SQLException {
// do nothing
* @see Connection#getHoldability()
public int getHoldability() throws SQLException {
return ResultSet.CLOSE_CURSORS_AT_COMMIT;
* NOT JDBC-Compliant, but clients can use this method
* to determine how long this connection has been idle.
* This time (reported in milliseconds) is updated once
* a query has completed.
* @return number of ms that this connection has
* been idle, 0 if the driver is busy retrieving results.
public long getIdleFor() {
if (this.lastQueryFinishedTime == 0) {
return 0;
} else {
long now = System.currentTimeMillis();
long idleTime = now - this.lastQueryFinishedTime;
return idleTime;
* Should we tell MySQL that we're an interactive client
* @return true if isInteractiveClient was set to true.
public boolean isInteractiveClient() {
return isInteractiveClient;
* A connection's database is able to provide information describing
* its tables, its supported SQL grammar, its stored procedures, the
* capabilities of this connection, etc. This information is made
* available through a DatabaseMetaData object.
* @return a DatabaseMetaData object for this connection
* @exception java.sql.SQLException if a database access error occurs
public java.sql.DatabaseMetaData getMetaData() throws java.sql.SQLException {
checkClosed();
return new DatabaseMetaData(this, this.database);
* You can put a connection in read-only mode as a hint to enable
* database optimizations
* <B>Note:</B> setReadOnly cannot be called while in the middle
* of a transaction
* @param readOnly - true enables read-only mode; false disables it
* @exception java.sql.SQLException if a database access error occurs
public void setReadOnly(boolean readOnly) throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = { new Boolean(readOnly) };
Debug.methodCall(this, "setReadOnly", args);
Debug.returnValue(this, "setReadOnly", new Boolean(readOnly));
checkClosed();
this.readOnly = readOnly;
* Tests to see if the connection is in Read Only Mode. Note that
* we cannot really put the database in read only mode, but we pretend
* we can by returning the value of the readOnly flag
* @return true if the connection is read only
* @exception java.sql.SQLException if a database access error occurs
public boolean isReadOnly() throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = new Object[0];
Debug.methodCall(this, "isReadOnly", args);
Debug.returnValue(this, "isReadOnly", new Boolean(this.readOnly));
return this.readOnly;
* @see Connection#setSavepoint()
public java.sql.Savepoint setSavepoint() throws SQLException {
throw new NotImplemented();
* @see Connection#setSavepoint(String)
public java.sql.Savepoint setSavepoint(String arg0)
throws SQLException {
throw new NotImplemented();
* DOCUMENT ME!
* @return DOCUMENT ME!
public TimeZone getServerTimezone() {
return this.serverTimezone;
* DOCUMENT ME!
* @param level DOCUMENT ME!
* @throws java.sql.SQLException DOCUMENT ME!
public void setTransactionIsolation(int level) throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = { new Integer(level) };
Debug.methodCall(this, "setTransactionIsolation", args);
checkClosed();
if (this.hasIsolationLevels) {
StringBuffer sql = new StringBuffer(
"SET SESSION TRANSACTION ISOLATION LEVEL ");
switch (level) {
case java.sql.Connection.TRANSACTION_NONE:
throw new SQLException("Transaction isolation level "
+ "NONE not supported by MySQL");
case java.sql.Connection.TRANSACTION_READ_COMMITTED:
sql.append("READ COMMITTED");
break;
case java.sql.Connection.TRANSACTION_READ_UNCOMMITTED:
sql.append("READ UNCOMMITTED");
break;
case java.sql.Connection.TRANSACTION_REPEATABLE_READ:
sql.append("REPEATABLE READ");
break;
case java.sql.Connection.TRANSACTION_SERIALIZABLE:
sql.append("SERIALIZABLE");
break;
default:
throw new SQLException("Unsupported transaction "
+ "isolation level '" + level + "'", "S1C00");
execSQL(sql.toString(), -1, this.database);
isolationLevel = level;
} else {
throw new java.sql.SQLException("Transaction Isolation Levels are "
+ "not supported on MySQL versions older than 3.23.36.", "S1C00");
* Get this Connection's current transaction isolation mode.
* @return the current TRANSACTION_* mode value
* @exception java.sql.SQLException if a database access error occurs
public int getTransactionIsolation() throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = new Object[0];
Debug.methodCall(this, "getTransactionIsolation", args);
Debug.returnValue(this, "getTransactionIsolation",
new Integer(isolationLevel));
if (this.hasIsolationLevels) {
java.sql.Statement stmt = null;
java.sql.ResultSet rs = null;
try {
stmt = this.createStatement();
String query = null;
if (this.io.versionMeetsMinimum(4, 0, 3)) {
query = "SHOW VARIABLES LIKE 'tx_isolation'";
} else {
query = "SHOW VARIABLES LIKE 'transaction_isolation'";
rs = stmt.executeQuery(query);
if (rs.next()) {
String s = rs.getString(2);
if (s != null) {
Integer intTI = (Integer) mapTransIsolationName2Value.get(s);
if (intTI != null) {
return intTI.intValue();
throw new SQLException("Could not map transaction isolation '" + s + " to a valid JDBC level.", "S1000");
} else {
throw new SQLException("Could not retrieve transaction isolation level from server", "S1000");
} finally {
if (rs != null) {
try {
rs.close();
} catch (Exception ex) {
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rs = null;
if (stmt != null) {
try {
stmt.close();
} catch (Exception ex) {
// ignore
stmt = null;
return isolationLevel;
* JDBC 2.0
* Install a type-map object as the default type-map for
* this connection
* @param map the type mapping
* @throws SQLException if a database error occurs.
public void setTypeMap(java.util.Map map) throws SQLException {
this.typeMap = map;
* JDBC 2.0
* Get the type-map object associated with this connection.
* By default, the map returned is empty.
* @return the type map
* @throws SQLException if a database error occurs
public synchronized java.util.Map getTypeMap() throws SQLException {
if (this.typeMap == null) {
this.typeMap = new HashMap();
return this.typeMap;
* The first warning reported by calls on this Connection is
* returned.
* <B>Note:</B> Sebsequent warnings will be changed to this
* java.sql.SQLWarning
* @return the first java.sql.SQLWarning or null
* @exception java.sql.SQLException if a database access error occurs
public java.sql.SQLWarning getWarnings() throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = new Object[0];
Debug.methodCall(this, "getWarnings", args);
Debug.returnValue(this, "getWarnings", null);
return null;
* Allow use of LOAD LOCAL INFILE?
* @return true if allowLoadLocalInfile was set to true.
public boolean allowLoadLocalInfile() {
return this.allowLoadLocalInfile;
* DOCUMENT ME!
* @return DOCUMENT ME!
public boolean capitalizeDBMDTypes() {
return this.capitalizeDBMDTypes;
* After this call, getWarnings returns null until a new warning
* is reported for this connection.
* @exception java.sql.SQLException if a database access error occurs
public void clearWarnings() throws java.sql.SQLException {
if (Driver.TRACE) {
Object[] args = new Object[0];
Debug.methodCall(this, "clearWarnings", args);
// firstWarning = null;
* In some cases, it is desirable to immediately release a Connection's
* database and JDBC resources instead of waiting for them to be
* automatically released ( -
Html to wml conversion help needed urgently
Hello everybody,
I need static HTML to WML code urgently as soon as possible.
Can please somebody help.
Moreover, how to discard the tags in HTML which are not in WML.The problem is that few tags are not mandatory to close.So, what should be the rule of discarding tags?
Please help!!!!
iwapsmshttp://www.google.co.uk/search?q=html+2+wml&start=0&ie=utf-8&oe=utf-8
-
A puzzling situation...help needed urgently!
This is somewhat related to the topic I posted here (the app is the same) : http://forum.java.sun.com/thread.jspa?threadID=5253292
So I managed to set things straight and pass the value of the floor selected from the drop down list to a page called FloorPlanRender.jsp (the parameter name is "floorselected", and I store this parameter into an integer variable of the same name as shown in the code for the whole page below). A controller class receives the request, initializes the DB connection and redirects to the appropriate JSP page (not shown in the codes below, but it works fine) -
[BTW, I have posted the entire code for the page and classes involved...that was just to make the code more informative. The problem seems to be in a very small part of the code alone].
<%@page language="java" contentType="text/html"%>
<%@page import="java.util.Iterator"%>
<%@page import="java.util.ArrayList"%>
<%@page import="seatplanner.beans.FloorPlanRenderElement"%>
<% String base = (String)application.getAttribute("base"); %>
<% String imageURL = (String)application.getAttribute("imageURL"); %>
<jsp:useBean id="dataManager" scope="application"
class="seatplanner.model.DataManager"/>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>Tech Mahindra SeatMaster® | Floor Plan</title>
<link rel="stylesheet" href="/TechMSeatPlan/css/pagestyle.css" type="text/css"/>
</head>
<body>
<div id="all">
<!-- Display logo -->
<div id="toppanel"> <jsp:include page="TopPanel.jsp"/> </div>
<br/> <br/>
<!-- Display main content -->
<div id="contentpanel">
<!-- Store the floor selected and get the row and column count for the floor -->
<% String floorselect = request.getParameter("floorselected");
int floorselected = Integer.parseInt(floorselect);
int rowcount = dataManager.getRowCount(floorselected);
int columncount = dataManager.getColumnCount(floorselected);
ArrayList<FloorPlanRenderElement> floorplanelements = dataManager.getFloorPlanElements(floorselected);
Iterator<FloorPlanRenderElement> iterator = floorplanelements.iterator(); %>
<!-- Create Table to display the grid -->
<% if(!(floorplanelements.isEmpty())) // Checks whether the retrieved ArrayList is empty or not
FloorPlanRenderElement anelement = new FloorPlanRenderElement();%>
<table id="floorplan">
<% while(iterator.hasNext())
for(int i=1; i==rowcount; i++)
{ %>
<tr>
<% for(int j=1; j==columncount; j++)
anelement = iterator.next(); // Store the elements one by one
%>
<td width=30px height=30px> <img src="<%=imageURL + anelement.floorelement.getElementType() + "-" + anelement.floorelement.getOccupied()%>"/> </td>
<% } //close for...j loop %>
</tr>
<% } //close for...i loop %>
<% } //close while... loop %>
</table>
<% } //close if, start else
else { %>
No floor plan exists. Please choose another floor.
<% } //close else %>
</div>
</div>
</body>
</html>
Now, using this value for floor selected, I have to get the rows and columns configured for this floor from a database. This involves performing a select max statement so that I can get the maximum row and column number respectively. So I call upon the relevant methods in the DataManager class by creating an object, which in turn gets forwarded to a class known as FloorPlanRenderPeer.java [The code for both are shown below]:
DataManager.java
package seatplanner.model;
import java.util.Hashtable;
import java.util.ArrayList;
import java.util.Enumeration;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import seatplanner.beans.FloorPlanRenderElement;
public class DataManager {
private String dbURL = "";
private String dbUserName = "";
private String dbPassword = "";
/*Basic and connectivity operations */
public void setDbURL(String dbURL) {
this.dbURL = dbURL;
public String getDbURL() {
return dbURL;
public void setDbUserName(String dbUserName) {
this.dbUserName = dbUserName;
public String getDbUserName() {
return dbUserName;
public void setDbPassword(String dbPassword) {
this.dbPassword = dbPassword;
public String getDbPassword() {
return dbPassword;
public Connection getConnection() {
Connection conn = null;
try {
conn = DriverManager.getConnection(getDbURL(), getDbUserName(),
getDbPassword());
catch (SQLException e) {
System.out.println("Could not connect to DB: " + e.getMessage());
return conn;
public void putConnection(Connection conn) {
if (conn != null) {
try { conn.close(); }
catch (SQLException e) { }
/* Floor related operations */
public ArrayList<Integer> getAllFloorNumbers() {
return FloorPeer.getAllFloorNumbers(this);
/* Floor Plan Rendering related operations */
public int getRowCount(int floorselected) {
return (FloorPlanRenderPeer.getRowCount(this, floorselected));
public int getColumnCount(int floorselected) {
return (FloorPlanRenderPeer.getColumnCount(this, floorselected));
public ArrayList<FloorPlanRenderElement> getFloorPlanElements(int floorselected) {
return FloorPlanRenderPeer.getFloorPlanElements(this, floorselected);
FloorPlanRenderPeer.java
package seatplanner.model;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import seatplanner.beans.FloorPlanRenderElement;
/* This class handles all floor plan rendering operations */
public class FloorPlanRenderPeer
/* This method returns the number of rows configured for the floor */
public static int getRowCount(DataManager dataManager, int floorselected) {
int rowcount=0;
Connection connection = dataManager.getConnection();
if (connection != null) {
try {
Statement s = connection.createStatement();
try
String sql = "select max(grid_x_pos) from seatplanner.floorgridpart where floor_id =" + floorselected;
ResultSet rs = s.executeQuery(sql);
try {
rowcount = rs.getInt(1);
finally { rs.close(); }
finally {s.close(); }
catch (SQLException e) {
System.out.println("Could not get row count: " + e.getMessage());
finally {
dataManager.putConnection(connection);
return (rowcount);
/* This method returns the number of columns configured for the floor */
public static int getColumnCount(DataManager dataManager, int floorselected) {
int columncount=0;
Connection connection = dataManager.getConnection();
if (connection != null) {
try {
Statement s = connection.createStatement();
try {
String sql = "select max(grid_y_pos) from seatplanner.floorgridpart where floor_id =" + floorselected;
ResultSet rs = s.executeQuery(sql);
try {
columncount = rs.getInt(1);
} finally { rs.close(); }
} finally {s.close(); }
catch (SQLException e) {
System.out.println("Could not get column count: " + e.getMessage());
finally {
dataManager.putConnection(connection);
return columncount;
/* This method returns all the grid elements needed to render the floor plan for the selected floor */
public static ArrayList<FloorPlanRenderElement> getFloorPlanElements(DataManager dataManager, int floorselected) {
ArrayList<FloorPlanRenderElement> floorplanrenderelements = new ArrayList<FloorPlanRenderElement>();
FloorPlanRenderElement oneelement = new FloorPlanRenderElement();
Connection connection = dataManager.getConnection();
if (connection != null) {
try {
Statement s = connection.createStatement();
String sql = "select distinct A.grid_x_pos, A.grid_y_pos, A.element_ID, B.element_type, B.occupied" +
"from seatplanner.floorgridpart A, seatplanner.floorelement B where (A.floor_ID = " + floorselected +
"and A.element_ID = B.ID) order by A.grid_x_pos, A.grid_y_pos asc";
try {
ResultSet rs = s.executeQuery(sql);
try {
while (rs.next()) {
oneelement.floorgridpart.setGridXPos(rs.getInt(1));
oneelement.floorgridpart.setGridYPos(rs.getInt(2));
oneelement.floorgridpart.setElementID(rs.getString(3));
oneelement.floorelement.setID(rs.getString(3));
oneelement.floorelement.setElementType(rs.getString(4));
oneelement.floorelement.setOccupied(rs.getString(5));
floorplanrenderelements.add(oneelement);
finally { rs.close(); }
finally {s.close(); }
catch (SQLException e) {
System.out.println("Could not get floor numbers: " + e.getMessage());
finally {
dataManager.putConnection(connection);
return floorplanrenderelements;
}When I run the application and choose my floor, the result throws me a "No floor plan exists...." [the else...part in the jsp page].
I have come to know that it is because for some odd reason, the rowcount and columncount variables are not being set properly. I have tested the queries used in the FloorPlanRender peer class in the mySQL query browser and they work (both the row and column count for floor 3 for example, should return 20). But they don't. When I printed out the rowcount and columncount variables, they were set to a 0. I thought the floorselected parameter wasn't retrieved from the previous page properly, but to my surprise it was successfully set to 3, indicating the desired floor number.
I can't begin to see where the error is. There is nothing wrong with the DB connection or the query, but the correct value is not being set to the variables in the jsp page.
Can someone please have a look at the code and guide me as to what possibly is going wrong? I have spent a lot of time and effort and still haven't spotted the mistake, if any. Your help is much appreciated.Again wrong usage of Iterator :)
<%@page language="java" contentType="text/html"%>
<%@page import="java.util.Iterator"%>
<%@page import="java.util.ArrayList"%>
<%@page import="seatplanner.beans.FloorPlanRenderElement"%>
<% String base = (String)application.getAttribute("base"); %>
<% String imageURL = (String)application.getAttribute("imageURL"); %>
<jsp:useBean id="dataManager" scope="application"
class="seatplanner.model.DataManager"/>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>Tech Mahindra SeatMaster® | Floor Plan</title>
<link rel="stylesheet" href="/TechMSeatPlan/css/pagestyle.css" type="text/css"/>
</head>
<body>
<div id="all">
<!-- Display logo -->
<div id="toppanel"> <jsp:include page="TopPanel.jsp"/> </div>
<br/> <br/>
<!-- Display main content -->
<div id="contentpanel">
<!-- Store the floor selected and get the row and column count for the floor -->
<% String floorselect = request.getParameter("floorselected");
int floorselected = Integer.parseInt(floorselect);
int rowcount = dataManager.getRowCount(floorselected);
int columncount = dataManager.getColumnCount(floorselected);
ArrayList<FloorPlanRenderElement> floorplanelements = dataManager.getFloorPlanElements(floorselected);
Iterator<FloorPlanRenderElement> iterator = floorplanelements.iterator(); %>
<!-- Create Table to display the grid -->
<% if(!(floorplanelements.isEmpty())) // Checks whether the retrieved ArrayList is empty or not
FloorPlanRenderElement anelement = new FloorPlanRenderElement();%>
<table id="floorplan">
<% while(iterator.hasNext()){
anelement = iterator.next(); // The iterator.next() every call would takes the pointer to the next element in the collection
for(int i=1; i==rowcount; i++){ %>
<tr>
<% for(int j=1; j==columncount; j++){%>
<td width=30px height=30px> <img src="<%=imageURL + anelement.floorelement.getElementType() + "-" + anelement.floorelement.getOccupied()%>"/> </td>
<% } //close for...j loop %>
</tr>
<% } //close for...i loop %>
<% } //close while... loop %>
</table>
<% } //close if, start else
else { %>
No floor plan exists. Please choose another floor.
<% } //close else %>
</div>
</div>
</body>
</html>For god sake please bother to understand how any implementation of java.util.Iterator works
for more info go through javadocs
http://java.sun.com/j2se/1.5.0/docs/api/java/util/Iterator.html
and i believe you have completey ignored my other suggestion of using enhanced loop in J2SE 5.0+ if iterator is confusing.
Anyways,hope the above might help you in fixing of what you are trying to..
REGARDS,
RaHuL
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