JSP :: Retrieve A BLOB From MySQL DB

Jan 9, 2015

I need to retrieve an image from the MySQL DB and display it in my JSP. The code below retrieves and displays the image with success. But, an exception is thrown:

SEVERE: Servlet.service() for servlet [jsp] in context with path [/FileFinalText] threw exception
[java.lang.IllegalStateException: getOutputStream() has already been called for this response] with root cause
java.lang.IllegalStateException: getOutputStream() has already been called for this response

[code]...

how can I resolve the cause with the getOutputStream() and prevent this exception to occur?

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JSP :: Retrieve Blob Img From MySql And Display Using Servlet?

Nov 27, 2014

create table imagedb (usd varchar(255) , image blob , primary key (usd), foreign key (usd) references logindb(user) on update cascade on delete cascade)

Using JSP i am able to upload the file into the blob. But icant retrieve or display;

The HTML Tag :

<table style="margin: 0px; margin-top: 15px;">
<tr>
<td id="photo">
<img src="displayimage" />
</td>
</tr>

The Servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Connection conn = null;
Statement stmt = null;
try {
conn = (Connection) DriverManager.getConnection(DB_URL, USER, PASS);
stmt = (Statement) conn.createStatement();
// constructs SQL statement
Class.forName("com.mysql.jdbc.Driver");
Scanner s = new Scanner(System.in);

[code].....

I am not getting the image.

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Retrieve Image From MySQL DB And Display In Jtable If Image Type Is Medium Blob Using Swings And Hibernate

Jan 5, 2015

I stored an image into MySQL database using swings and hibernate but I am struggling to retrieve that image from MySQL database and display same image in the jTable cell and same as on jLabel whatever I retrieve from the database using swings and hibernate .

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String To Blob Or Clob Conversion?

May 11, 2015

how to convert string to blob or clob data type in java coding?

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Use JAVA In Oracle To Send Blob To Printer?

Sep 18, 2014

I used the PLPDF software to generate a blob in PDF format in PL/SQL. I can open it in a browser but I would rather send it directly to a printer from PL/SQL.
 
I know I can use tools like BI and Jasper but I want this particular solution to be 100% database solution.
 
I was wondering of I can use JAVA in Oracle to send the blob to a printer.

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Write Byte Array To BLOB Field In Database

Mar 2, 2014

I am trying to write a byte array to a blob field in my database.

Below code is not working for me because the object is actually 902 bytes, however, the database tells me that it is 11 bytes once committed.

How to write to the blob field in my database?

Java Code:

protected void addFingerprint(byte[] fingerprintBytes) {
Statement stat;
try
{
updateQuery = "UPDATE " + currentTable + " SET CLERK_FINGERPRINT_DATA_BLOB = '"

[Code] ....

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JDBC :: Prepare Statement To Insert Row That Contains Blob Column?

Mar 3, 2015

When we make prepare statement to insert a row that contains Blob column. Which way is correct? And what is the difference?

     1.  Preparestatement.setBlob(parameter number, blob type object)
     2. Preparestatement.setBlob(parameter number, inputstream type object)
 
This link show the test I made : [URL] ....

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Download Image (stored As Blob) From Database To Client Machine?

Jul 2, 2014

We have web based application (Oracle DB, Weblogic middle tier) and a applet based application running on the browser.

We have a requirement to Load images from the database (stored as blob) to the client browser and the users can do the lookup on images when needed.

We need this to perform well, so there is no delay for the user experience. We have 2 options:

1. Load the images from the database to the Application Server and keep it. When the client request from the browser comes, download it from the application server.

2. Load the images (asynchronosly) when the user logs into the application and download them to the Client machine? Is this possible? Especially give that it is stored in the database as binary objects?
And then load for the user from the client box itself, upon request.

If 2nd option is possible, which once is recommended?

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Can't Retrieve Employees IDs

Oct 15, 2014

If my xml file (shown below as sample) has different employees with id's - is there a way I can get just the id's on there own?

Java Code:

<Employees>
<Employee id="1">
<age>29</age>
<name>Pankaj</name>
<gender>Male</gender>
<role>Java Developer</role>
</Employee>
<Employee id="2">
<age>35</age>
<name>Lisa</name>
<gender>Female</gender>
<role>CEO</role>
</Employee>
</Employees> mh_sh_highlight_all('java');

This is the code Im using - I know at the minute it gets the id details of id 3 but realistically I just want the id's and nothing else

Java Code:

private static String getEmployeeById(Document doc, XPath xpath, int id) {
String env = null;
try {
XPathExpression pathExpression =
xpath.compile("/Employees/Employee[@id=3]"); // line gets everything to do with id 3 but doesn't display the id

[code]....

Can this be achieved using xpath? I've been stuck on it for ages and I can't seem to really find anything to do with it

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How To Retrieve A Character From String

Mar 7, 2014

String charAt() method returns a particular Character at the specified index in the String.

How is this function implemented internally?. How a particular character can be retrieved from String?.

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JDBC :: How To Retrieve Just One Value From Database

Nov 25, 2014

I wish to retrieve just one value from db;
 
so I use this code:

@Transactional
    public long getSequenceSedeB(Long id) {
        BigDecimal seqValue = nu
        String sql = "SELECT MAX(ID) FROM SEDE_B_ALLEGATI_A WHERE ID_SEDE=:id";
        SQLQuery query = getSession().createSQLQuery(sql);

[Code] ....

But it do not works; this is the log.

type.NullableType (NullableType.java:182) - could not read column value from result set: ID; Invalid column name

2014-11-25 14:45:14,476 WARN  [btpool0-2] util.JDBCExceptionReporter (JDBCExceptionReporter.java:77) - SQL Error: 17006, SQLState: null
2014-11-25 14:45:14,478 ERROR [btpool0-2] util.JDBCExceptionReporter (JDBCExceptionReporter.java:78) - Invalid column name

 But in the database the query
 
SELECT MAX(ID) FROM SEDE_B_ALLEGATI_A WHERE ID_SEDE=:id
 
run correctly;
 
Also I need to rewrite the statement
   query.setParameter("id", 923);
in this way
   query.setParameter("id", AAA);
 
where AAA is gotten from out of the procedure;

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How To Retrieve Information From Poker Sites

Apr 20, 2015

I am pretty new to java and where I should start. What I am trying to do, is to retrieve live information from poker sites as I play, typically my hand and the pot size. Is this possible? I know poker sites probably are very secure, but I can see those things (my hand, and the pot) anyway, I just want it to happen automatically. What I am trying to do, is to create a program that retrieves the information, and then calculate the odds of me winning.

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JSP :: Retrieve Resultset Data From Listbox

Apr 2, 2014

I have retrieve the data in listbox from my database already and now again i want to select the data from this listbox and query on it , is it possible?

For Ex i have listbox as follows

<h4>Models For Selected Pattern:</h4>
</br>
<select Name="drop_model" multiple="true">
<%

try {
Class.forName(driver).newInstance();
conn = DriverManager.getConnection(url,username,userPassword);
Statement stmt = conn.createStatement();

[Code] ....

In this listbox some values are retrieved from database as

<option value="xyz">xyz</option>
<option value="pqr">pqr</option>
<option value="abc">abc</option>
<option value="lmn">lmn</option>

I want to select this values from listbox and query on them....

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Servlets :: How To Retrieve Values Of Radio Buttons

Jan 20, 2014

<html>
<body>
<form action="login">
Male:<input type ="radio" name ="sex" value="Male"> <br>
Female:<input type = "radio" name="sex" value="Female"> <br>
<input type="submit" value="Enter">

[Code] ....

when the see the result i just get a strange value as "ON" but I am not getting the required value ,I mean Male or Female.

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Servlets :: Retrieve Complete Rows Of Table Using JSP

May 8, 2014

I have one table in mysql in that some rows are there i want to retrieve all rows using servlet and jsp concept and i have done half of the way but not getting output it is showing some info and nothing getting printed on page except columns heading and here is my bean class..

public class TimeDetailBean {
private Time intime;
private Time outtime;
private Date date;
private String eid;

public Time getInTime() {
return intime;

[Code] .....

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How To Retrieve Index Of Specific Element In Array

Mar 3, 2015

I'm trying to iterate through an array of integers and find the start position of the part of the array containing the most consecutive 1s.

For example given the array {1,3,1,1,1,1,5,3,2,1,1}, the method should return 2 and given {1,4,5,1,1,1,5,1} the method should return 3.

So far, I've managed to retrieve the element where the consecutive 1s begin. However, I'm unsure how to get the index of this element and this implementation doesn't work if there is more than one set of consecutive 1s.

public class GetIndex {
public static int getPosition(int[] myArray) {
int index = 0;
int tracker = 0;
int mostOnes = 0;
for(int i = 0; i < myArray.length; i++) {

[Code] .....

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JSP :: Best Way To Retrieve Thousand Rows From Database For Encoding?

Mar 6, 2015

I have to create a webpage such that there is an 'import' and 'save' button.

When the user clicks import button, it will retrieve inventories under PRODUCTS table which contains product title, SRP and Sold by (input field) under his account. Average possible returned rows will be around 1k-5k. If the 'Sold By' has value, it will show as read only. But if not, it will be editable.

Then the user has a list of product IDS printed on a paper that was sold by his employees and he has to scan each product id and put the name of his employee under Sold By and the price sold. This is a manual procedure..

Then after he finishes encoding, he has to click save button to save changes in the db.

what is the best way to implement this? Is it efficient to use js functions such as datatables?

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Loaded ArrayList But Can't Retrieve Stored Values

Nov 4, 2014

I am creating a shopping list, with each element and object called product from the Item attribute class. Each product object has a description, price, and priority. From user input, I am able to create each product object, and then .add to my arraylist. I know that it successfully adds because I have it printed in each iteration of the do-while loop. Once the user indicates they want to quit, the loop ends. I then want to print each description, price, and quantity but this for loop will only print the last element over and over. Here is what I have:

ArrayList <ItemAttribute> list = new ArrayList<ItemAttribute>();
Scanner keyboard = new Scanner(System.in);
ItemAttribute product = new ItemAttribute();
public void findDescrPrice() {
/**
* Get the item name (description) for each list item

[code]...

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Can't Retrieve Jtext Field Values From Another Frame

Mar 25, 2014

I am trying to retrieve jtext fields and combo box values from another frame and to put them in database but .getText() doesn't return anything ...

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try{
String sql = "select * from login where uid = ? and pass = ?";
pst = con.prepareStatement(sql);
pst.setString(1, jTextField1.getText());
pst.setString(2, jTextField2.getText());
rs = pst.executeQuery();
if(rs.next()){

[Code] .....

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How To Store And Retrieve Thumb Impression In DB Using Java

Jul 16, 2014

i want to store and retrieve thumb impression from a database using java.now i am learning java so i want to do the coding using java.i want to know which database is used to store thumb impressions ?

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Retrieve Data From Database By Joining Tables

Dec 23, 2014

I am trying to retrieve data from my database by joining my tables. So far i have managed to join my four tables in my database and retrieve all the information in that table. Now what i want to do is create a prepared statement in java that allows me to retreive certain data. Here is my joining query.

SELECT student.idNumber,student.names, student.surname,
course.description,
coursemarks.mark,
class.form,class.id
FROM `student`
LEFT JOIN `coursemarks` on student.idNumber = coursemarks.studentid
LEFT JOIN `course` on course.courseid = coursemarks.courseid
LEFT JOIN `class`on student.idNumber = class.studentID;

What I want is to select all the data depending on the class passed and the form passed, e.g a person might decide to select a certain form only or a certain form and class

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Random Access File - How To Retrieve Particular Set Of Data

May 4, 2015

I am creating a read/write, RandomAccessFile that I will use to store several student ID and gpa score. What I don't understand is how I should go about retrieving a particular set of data.

public class ReadWrite {
static Scanner keyboard = new Scanner(System.in);
static String fileName = "Stu.dat";
static RandomAccessFile raf;
public static void main(String [] args) throws FileNotFoundException, IOException {

[Code] .....

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JSP :: Auto Populate A Bean And Retrieve Values From It

Apr 25, 2014

Ok I am trying to auto populate a bean and retrieve the values from it using the jsp:useBean tags ect..

My code looks like this..

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String redirect = request.getParameter("page").trim();
if(redirect.equals("create_account"))
response.sendRedirect("/WebProgrammers/sign_on_server_pages/"+redirect+".jsp");
if(redirect.equals("confirm_info"))

[Code] ....

The error my Apache Tomcat is throwing

org.apache.jasper.JasperException: An exception occurred processing JSP page /sign_on_server_pages/confirm_info.jsp at line 91

88:
89:
90: %>
91: <jsp:useBean id="acct" type="beans.Creating_Account" scope="application"></jsp:useBean>

[Code] ....

I have tried sever different values for the scope attribute and all of them say the same thing about 'not found in scope'.

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JDBC :: CLOBs - Retrieve Set Of Records Via Ref Cursor

May 21, 2015

I am working on a Java program that calls a stored procedure in an Oracle 11.2g database and retrieves a set of records via a ref cursor. The program follows the standard Connection/CallableStatement/ResultSet pattern. A ResultSet object is used to access and iterate through the returned cursor, processing each record in turn.
 
One of the database fields returned in the cursor is a CLOB, which I'm retrieving using the NClob class's getNClob() method. Two other methods - length() and getSubString() are then used to get the length of the CLOB and copy of it off to a String object respectively.
 
The problem is that these latter two method calls are relatively slow, taking around 80ms to complete for modestly sized CLOBs of, say, around 10KB in size.
 
Is this the most efficient way to access a CLOB and retrieve its contents? If so, is there anything I can do, to make it run faster?

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Servlets :: How To Retrieve Grouped Items From HTML Form

Mar 5, 2015

I am having an issue with retrieving "grouped" data from HTML form to servlet. I will describe the scenario below.

In companies, they record the salary of the employees once a month.When they record it, they do not do it by visiting each an every employees personal "profile" (or whatever according to the system). Instead what they do is apply the salaries of all of them in one page.

To do the above thing they prefer excel like tabular sheets. Now, I have a html form, where the form content is a table. One row is dedicated to a one employee.

Below is my form.

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>

[Code] .....

As you can see, I have wrapped every row with a `<tbody>`. The `value` attribute of the `<tbody>` will contain the employee id. Once the form is submitted, the below servlet will capture it.

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

[Code] .....

What I was trying is get the `value` attribute of `<tbody>` (so I can identify the id of the employee) and get the data inside that `<tbody>`. However this didn't work, because I ended up with `NullpointerException` because it failed to read the `<tbody>` value.

So, how can I pass the data from table to servlet where it can clearly understand that one row is representing data belong to a one employee? If this is not the way to do it, I am also open for other methods.

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JSP :: Retrieve Data From Database And Display In View Page

Aug 31, 2014

I am creating a small application.I have a jsp font page.i have a jdbc connection code.I have a sample table in my database.i want to retrieve datas from the database and display them in the view page.

My questions are:

-Where do i have to write jdbc code?
-How can i display the retrieved data in the display page?

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