JavaRanch JDBC

How to handle larg ResultSet

Fri, 9 May 2008 11:02:58 MDT

I am a developing an application where the user can type any query and the query will be executed on a selected database.

How can I handle a larg ResultSet? 10 millin + rows.

I implemented pagination, so I don't transfer all of the rows, but the a select query takes 30 min to execute.

I used Statement.setFetchSize() but it didn't help?

Any suggestions?

Thanks

getting I/O Error: DB server closed connection

Fri, 9 May 2008 02:48:57 MDT

I am getting the Following exception while trying to connect to the SQLSErver DB

I am using jtds-1.2.2.jar File.

I am using Windows Authentication and i am able to connect though the SQL SErver Client Application

I complete stack trace is pasted below

org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (I/O Error: DB server closed connection.)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1225)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at sgstool.dbConnection.DBConnector.getSimpleConnection(DBConnector.java:43)

Can anybody tell me why this is occuring and tel...

java

Fri, 9 May 2008 01:26:57 MDT

How do you connect without the Class.forName (" ")

JSP and Access - Date function problems

Thu, 8 May 2008 23:18:57 MDT

Hi,
We are designing a JSP page and the backend is MS-Access. In Access, the date format is in SHORT format (MM/dd/yyyy). Now I need to query my access tables using the Java date objects created in the JSP. The following is the method I am trying now:

code:

 Calendar calendar = new GregorianCalendar();
 Date date = calendar.getTime();
 DateFormat localFormat = DateFormat.getDateInstance();

ResultSet is closed exception

Thu, 8 May 2008 09:14:55 MDT

Hi All,

I would appreciate it if somebody could help with below mentioned exception.

5/8/08 11:06:53:810 EDT] 00000024 SystemErr R com.ibm.websphere.ce.cm.ObjectClosedException: DSRA9110E: ResultSet is closed.
[5/8/08 11:06:53:810 EDT] 00000024 SystemErr R at com.ibm.ws.rsadapter.jdbc.WSJdbcResultSet.runtimeXIfNotClosed(WSJdbcResultSet.java:2691)
[5/8/08 11:06:53:810 EDT] 00000024 SystemErr R at com.ibm.ws.rsadapter.jdbc.WSJdbcResultSet.getString(WSJdbcResultSet.java:1830)
[5/8/08 11:06:53:810 EDT] 00000024 SystemErr R at com.alticor.ebs.dbaccess.KeyIndQualStatAccess.getAllKeyIndPercntDtl(KeyIndQualStatAccess.java)
[5/8/08 11:06:53:810 EDT] 00000024 SystemErr R at com.alticor.e...

"Store Locator" sql results

Thu, 8 May 2008 09:08:55 MDT

I'm following this guide
http://code.google.com/support/bin/answer.py?answer=87134&topic=11364 (http://code.google.com/support/bin/answer.py?answer=87134&topic=11364)
to help me create store locator functionality, but changing the code to java. I have not actually gotten to the part that i will need to change as it took me some time to automate the geocoder funcionality in js and then pass to the db.

To test the Haversine sql code, i just tried it in the mysql command line window but i'm not getting any results.

Here is what i'm getting.

mysql> SELECT id, ( 3959 * acos( cos( radians(40) ) * cos( radians( lat ) ) * co
s( radians( lng ) - radians(-73) ) + sin( radians(40) ) * sin( radians(...

problem in connecting oracle database

Wed, 7 May 2008 21:56:54 MDT

i have used oracle as the database i think there is no problem in my java program because earlier it worked fine i think there is some problem in connecting to database.program is compiling but it keeps on running n not giving output.may be some problem in port number earlier i used 1521 it worked but now its not working please help me..........

General error at connecting with JDBC-ODBC

Wed, 7 May 2008 14:38:53 MDT

Hello!

I'm getting "general error" while I'm trying connect to a MSAcces database.I've made the DNS with JDBC-ODBC and I'm running my Jsp page with Tomcat 6.

what is the use of setFetchSize and setMaxRows methods in Statement.

Wed, 7 May 2008 07:48:52 MDT

Hi,

what is the use of setFetchSize and setMaxRows methods in Statement?

what is the use of setFetchSize method in ResultSet? ( Already Statement has
setFetchSize method)

thanks,
Thennam Pandian.

Result set empty

Wed, 7 May 2008 06:32:52 MDT

Hi all,
Basically i was makaing out one application. I had got the connection successfully, but when i iterate the resultset am getting no values as well as its size too is 0. Below am posting out the excerpts of my code and the output i'am getting. Can anyone please advice why this?

code:


 try {
conn = OracleDAOFactory.getConnection(DATA_SOURCE);// This data_source am getting from prop file
System.out.println("Inside DAO 1-------------------------- "+conn);
stmt = conn.createStatement();
System.out.println("Inside DAO 2-------------------------- "+stmt);
rs = stmt.executeQuery(QUERY);
System.out.println("Inside DAO 3-------------------------- "+rs);

...

db connection pool manager

Wed, 7 May 2008 04:46:52 MDT

Dear all,
i want not to make connection in classic way.. i want to use open source and easy for use as well as reliable connection pool manager for my project.
would any one tell me about one popular of connection pool manager please.

PreparedStatement!

Wed, 7 May 2008 04:28:52 MDT

Hi All,

please can anyone explain me the meaning of precompiled ...

thanks & regards,
seetharaman

monitoring querys

Tue, 6 May 2008 09:02:49 MDT

Hello,

Its possible to know if someone is try to gain acces to my database ?

I want to monitoring my database ( in sql server 2000 ) named PRODUTION.

I whant a report or alert allways some service or app make a sql select against to my database . and this report must show me the user and the table that are afect

Its possible to do that ?

Regards

Finding the number of active database connections

Tue, 6 May 2008 07:36:49 MDT

Hi,

Is it possible to find the number of active connections to a database using java? Am using Mysql.

Regards
Anil

does mysql support pl/sql?

Tue, 6 May 2008 05:46:49 MDT

does mysql support pl/sql?

How to access an java API from oracle database

Tue, 6 May 2008 00:34:48 MDT

Hi All,

I need to access an API from a procedure, i.e. need to use an method present in it. Is there any way i can access the method.

need how on how to create a database

Mon, 5 May 2008 12:20:47 MDT

hello everyone
i need you help with the following questions
i am tryig to create a database for my project with the following informantions. the database is on a accident log database of a police station listing
- car imformation
- car registration
- times car been involved in accident
- drivers informations
- types of accidents
- fine or purnishments
- all other informations that can go into the database including usernames and passwords.
would be greatfull if anybody can help me
thank you all
have a nice time coding

resultset.next() implicitly closed in MySQL

Mon, 5 May 2008 07:20:46 MDT

Hello I have a problem with resultset implicitly closing after calling
while(resultset.next())

The exact error is:
java.sql.SQLException: Operation not allowed after ResultSet closed at ... mypckg.MyClass.doPost(MyClass.java:123) at ...
Line 123 is while(resultset.next())

The query I was doing is some update statement. It works the first next() then SQLException. When I check the DB the record was updated ... just can't go to the next record and continue updating or if last record return false.

Does anyone know what's the cause to this? I'm using Connector/J 5.1.5 JDBC driver for MySQL.

Also according to the API for java.sql.ResultSet for the next() method

...

Bigger type length than Maximum

Mon, 5 May 2008 06:26:46 MDT

Hi,
I'm running the following JDBC snippet and getting the exception "java.sql.SQLException: Bigger type length than Maximum"..

Code Snippet
--------------
CallableStatement stmt = null;
stmt = dbservice.getConnection().prepareCall("{ call mailpack.GET_ROW_COUNT(?,?,?,?) }");
stmt.setString(1,dealerId);
stmt.setString(2,userType);
stmt.setString(3,viewSentReceived);
stmt.registerOutParameter(4,OracleTypes.CURSOR);
stmt.executeQuery();
Stack Trace
------------

java.sql.SQLException: Bigger type length than Maximum
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:124)
at oracle.jdbc.driver.DatabaseError.throwSqlException(...

Error inserting data into database after few successfull insert.

Sun, 4 May 2008 09:38:34 MDT

Hello,

I'm trying to insert 3000 reocrds into MySQL Database from CSV file using JDBC but after seccessfull insertion of aprox 1300 records, Its giving me the connection refuse to connect.

Stack Trace :

code:

 
Updating Database Please Wait...
2775
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: 
 
** BEGIN NESTED EXCEPTION ** 
 
java.net.SocketException
MESSAGE: java.net.ConnectException: Connection refused: connect
 
STACKTRACE:
 
java.net.SocketException: java.net.ConnectException: Connection refused: connect
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSoc...

java db derby

Sun, 4 May 2008 09:36:34 MDT

Dear all,
i want to ask about java db derby.i enter sun.com and i read about it.my question is "It is reliable for J2EE projects"
anyone has an experience about it.
Thanks a lot.

FileChooser.getSelected() turn into Blob

Sat, 3 May 2008 10:06:31 MDT

I have a file chooser and I want to take the selected file, and turn it into a Blob so I can store it in a MySQL DB... Does anyone have any advice?

Note: I did look around previous forums and didn't find anythign quite liek this.

Here is a code snippit:

code:

 chooser = new JFileChooser();
 FileNameExtensionFilter filter = new FileNameExtensionFilter(
 "Textual documents", "doc", "txt");
 chooser.setFileFilter(filter);
 int returnVal = chooser.showOpenDialog(getParent());
 if(returnVal == JFileChooser.APPROVE_OPTION) {
 System.out.println("You chose to open this file: " +
 chooser.getSelectedFile().getName());


Pass js value to select where clause
Thu, 1 May 2008 12:22:25 MDT
Hi,
I am trying to take the values from a hidden field created with a js function and pass them into a select...from...where clause and can't seem to get the syntax right. The js function stores the values like ("cat,dog") but for the where clause I need them to be like ("cat","dog"). I am not sure whether this is more a js question or jdbc question, so please forgive me if I am in the wrong forum. I will attach my function. Thanks in advance for any suggestions.
code:
 
 function populateHiddenStatus(fromObject,toObject) {
 var output = '';
 for (var i=0, l=fromObject.options.length;i<l;i++) {
 if (fromObject.options[i].selected)
 output +=(fromObject.option...


Sql Connection
Thu, 1 May 2008 03:44:24 MDT
ganeshseluka@gmail.com (mailto:ganeshseluka@gmail.com) 
how to find sql Connection is open or closed


Connection problem with oracle
Wed, 30 Apr 2008 23:44:23 MDT
I am trying to connect to oracle 10 g databas on my local system. operating system is vista. A using netbeans IDE
 
code:

String url="jdbc:oracle:thin:@localhost:1521:orcl";

try
{

 Class.forName("oracle.jdbc.driver.OracleDriver");
 
 Connection con;
 con=DriverManager.getConnection(url,"system","deepak");

 java.sql.Statement stmt= con.createStatement();
java.sql.ResultSet rs= stmt.executeQuery("select * from kbs");
 
 
while(rs.next())
{
System.out.println("values:"+rs.getInt(1));
}
}
catch(Exception e)
{
System.out.println("Error");
e....


Pl/sql getting row one by one
Wed, 30 Apr 2008 15:24:22 MDT
Hi 
 
In my java class, I am connecting to a database and want to get a particular column (longblob type) from a particular table. I dont want to get all the rows in one time as I will get memory problem surely. 
I want to get a row one by one, So can anyone please tell me how should I do that?


Regarding DatabaseMetaData interface
Wed, 30 Apr 2008 10:42:22 MDT
Hi Friend,
 I am sidiq.
 I am working as java developer.
 I have question regarding java interface DatabaseMetaData. 
 Below code is getting the column to the table namely OATSSEND. 
 I known that OATSSEND table has only one column namely OATS_SEND_DATA. 
 After following code ran I got ResultSet of size is 2 with same OATS_SEND_DATA was printed twice.
 
public static List getTableCols(Connection con, String engine, String schemaPattern, String table) throws SQLException {
 
List list = null;
ResultSet rs = null;

if(engine.equalsIgnoreCase( "as400DB2") || engine.equalsIgnoreCase( "DB2"))
{
 rs = con.getMetaData().getColumns( null, null," OATSS...


how to connect jsp to mysql
Wed, 30 Apr 2008 08:06:21 MDT
can someone teach me? :(


Can I use a Clob as an attribute of a structured type (to map to a Java VO)?
Wed, 30 Apr 2008 06:30:21 MDT
Hi,
 
I'm trying to use a Clob as an attribute of a structured type, but I'm having trouble retrieving the Clob from Oracle, resorting to explicitly retrieving it in a seperate query on a database column. Is there a way of retrieving it as part of a Java VO? I haven't found it explicitly printed where it's not possible, but I have a nagging idea that it isn't. Any ideas?
 
I'm using Java 1.4 (soon to be Java 1.5), and Oracle 10.1.2.
 
Any help, greatly appreciated.
 

The code :
 
My VO (CharacterDataVO) contains 2 attributes - an id (BigDecimal), and data (the Clob). I'm calling a stored procedure, and it bombs out when I hit callable.execute(), and reports a StringIndexOutOfBoundsExc...


Conversion Blob to Byte Array
Wed, 30 Apr 2008 05:58:21 MDT
I am trying to convert a Blob into a Byte array but sometimes when i run the application I get this exception
 
Blob may not be manipulated from creating session 
 
this is the way i am converting Blob to byte Array
 
code:

Blob blob = employerxLogo.getImageByte();
byte[] tempByte = null;
try {
int tempInt = (int) blob.length();
tempByte = blob.getBytes(1, tempInt);} catch (SQLException e) {
// TODO Auto-generated catch block
throw new FacesException("Error");
}

 
Is there another way to convert a java.sql.Blob into a Byte array


Error attempting to submit data via a form
Wed, 30 Apr 2008 04:38:21 MDT
Hi all, I'm doing a very basic sign up page for myself and have run into a bit of bother. I have an SQL Database called "project", which has a table called "users" containing 2 fields - userName and password (very original I know), and a form which uses JSP to submit data to that database, to a table called users in particular.
I can connect to the table in the database fine - if I access the page the data should be processed to, two blank values are added to the table. But when I attempt to submit the data via a form I get the following - 
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Too few parameters
 
 
This is the JSP page that submits the data (I've taken out the unecessary HTML tags) :


how to install JDBC?
Wed, 30 Apr 2008 03:26:21 MDT
i downloaded it. but cant find the setup


nested object collection to PL/SQL Procedure as an Input
Wed, 30 Apr 2008 03:18:21 MDT
How to send nested object collection to PL/SQL Procedure as an Input parameter.
 
The scenario is there is a parent mapping object containing a collection(java.sql.Array) of child objects.
I need to send the parent object collection to PL/SQL procedure as a input parameter.
public class parent{
String attr1;
String attr2;
Child[] attr3;
}
public class Child{
String attr1;
SubChild[] attr2;
}
public class SubChild{
String attr1;
}
 
Urgent!!!


Prepared statement
Wed, 30 Apr 2008 02:34:21 MDT
Looks like your interviewer is Dumb you are damm right 
prepared statements are pre compiled by query engine of any DBMS and it stores in the database ..


jdbc oracle 8i connectivity
Wed, 30 Apr 2008 02:32:21 MDT
I have SERVER 2000 server machine with oracle 8i enterpise version
and client machine having xp and oracle 8i client
server name "server"
from sql it is working fine
server ip address 192.168.100.1
client ip address 192.168.100.12
user id scott
password tiger
now i want to connect oracle database at server through jdbc 
java have been installed in client
jdbc downloaded to this machine
when i am running simple java file is working fine but 
i can not connect oracle through jdbc 
i wnat to ser classpath
i am a beginer so kindly give me a very simple java file for oracle database connectivity
with jdbc
 

thanking you 
anup


Debug an Oracle procedure fired from JDBC?
Wed, 30 Apr 2008 01:12:20 MDT
How can I debug an Oracle procedure when the procedure is fired from a JDBC call? I am using weblogic 9..
 
Regards
Rahul


Not Quite sure how there is a SQLException on this line...
Tue, 29 Apr 2008 18:58:20 MDT
Hi,
 
I am trying to just get the value of a column in a DB that stores an int. The value is not null. I have tried both using a column name and index number and with both I get a SQLException error. This is the code:
 
code:
 
public void actionPerformed(ActionEvent evt) {
JButton Clicked = (JButton) evt.getSource();
ClickedText = Clicked.getText();
 System.out.println(ClickedText);
 
try {
General.Database.createDBConnection(); //establishes connection to DB
Connection conn = (Connection) General.Database.getConn();
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT ProcessStep FROM table "
+ "WHERE I...


Cannot create PoolableConnectionFactory
Tue, 29 Apr 2008 13:24:19 MDT
Hi,
 
I have problems with using a database that is available on our remote server. 
 
My code works when I use local database with the settings in Tomcat
 
<Resource name="jdbc/database" auth="Container" type="javax.sql.DataSource" username="user" password="pass" driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver" url="jdbc:microsoft:sqlserver://localhost:1433;databaseName=database" maxActive="200" maxIdle="100"/>
 
I can even access all databases on LAN
url="jdbc:microsoft:sqlserver://LANIP:1433;databaseName=database" 
 
but when I try accessing remote IP url="jdbc:microsoft:sqlserver://RemoteIP:1433;databaseName=database" 
 
I get this error 
org.apach...


Prepared statment
Tue, 29 Apr 2008 03:16:18 MDT
Hi,
 
Yesterday I faced one ques in interview....wats the diff. between prepared statement and simple statemnet,I said they are precomplied,then interviewer further asked me where the precomplied statement stroed so that we can call it again and again.
 
I said it's stored in Database...but he said no...
 
Please tell me the ans.I done some googling but didn't able to find the ans.
 
Thanks


Batch Insert
Mon, 28 Apr 2008 13:34:16 MDT
Hi all,
 
I am using oracle database. I want to do a batch insert, i want to know is it possible. I have Distribution Class which contains Distribution Package Id, Product Type List and Channel List. I have around List of 50000 Distribution objects which needs to be inserted into DB. 
 
I have two table Product , Product Channel. 
 
Product - Product Id (Sequence,PK),Package Id, Product Type
Product Channel - Proudct Id , Channel Type
 
I want to do the insert as batch so that i can improve performance. My algorithum would look like thsi,
 
for each Distribution Object in the List
 Get the Package Id
 Get the Product List 
 Get the Channel List
 for each Pro...


result value
Mon, 28 Apr 2008 12:48:16 MDT
In the below code I am using a division operator division. How would I get the value of d?
 

code:
rs = wds.getquery(scat, year)
 
if(scat=="ALL)
{
 double d = rs.getInt(2);
}
else
{
double d1 = rs.getInt(2);
 
}
Double d = (d/d1) *100//Here I am not able to get the value of d, it is showing zero.



ORA-01874: time zone hour must be between -12 and 14
Mon, 28 Apr 2008 10:06:15 MDT
I have an application which retrieves current time from the system (JVM) and accordingly does some oracle database updates. For testing purpose, I'm using following code to set JVM clock to past date, so that I can test the application without spending much time for setting up the test data every day. But I get the following error when when I try to connect to oracle. Any idea what's going on?
 
Code for setting JVM time 
code:
 
public static void changeTime(final int hoursBehindParm) {

int hoursBehind = 6 + hoursBehindParm;

TimeZone.setDefault(new SimpleTimeZone((-hoursBehind * 60 * 60 * 1000)
, "GMT" + Integer.toString(-hoursBehind)
, Calendar.MARCH
, 2
...


'Connection has already been closed'. Random error connecting with a pool, platform i
Mon, 28 Apr 2008 04:22:15 MDT
Hi all,
I've got a problem I cannot solve, and really hope in someone's help...
The fact is: I'm working on a webapp which doesn't made use of frameworks or patterns or similars. I introduced the DAO pattern in order to organize and speed up the work. At the core of the new classes there is the DBDAO, and this is the way it obtains the connection:
 
code:

 protected Connection conn = null;
 
 ...
 
 protected Connection getConnection()
 {
 try
 {
 if (conn == null || conn.isClosed())
 {
 
 Context ctx = new InitialContext();
 javax.sql.DataSource ds=null;
 
...


SQL query to retrieve all nodes from X up until the root node in a tree structure
Fri, 25 Apr 2008 05:38:05 MDT
In my SQL-database 'exampledb' I've got a table called 'node' created using: (MySQL specific data included)
code:
CREATE TABLE `exampledb`.`node` (
 `id` int(11) NOT NULL auto_increment,
 `parent_id` int(11) default NULL,
 PRIMARY KEY (`id`),
 KEY `FK6D20BC9B57485125` (`parent_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_swedish_ci;

 
This table holds id's of nodes as well as the id of their parent node. For example this tree (nodes represented by the id numbers):
code:

 1
 / \
 2 3
 \
 4

Is represented in the node table as


Refresh Cursor in Stored proc Oracle
Fri, 25 Apr 2008 04:06:05 MDT
I have a stored procedure in which i define a cursor in the start like so:
code:

CURSOR PB_CANCEL_CUR IS SELECT * FROM TB_PB_TRADE_FEED
 WHERE MATCH_ID = 0
 AND ACTION_TYPE = 'C'
 AND ACTIVE_STATUS = 0 
AND ERROR_FLAG ='N' ORDER BY TRADE_REF_NUMBER;

 
After this, i iterate the loop and upon some conditions, i change the ACTIVE_STATUS and ERROR_FLAG to different values. Upon such an updation, that record should get erased from my cursor.
Hence, after the loop completes, i want to refresh my cursor, so that all such records which i updated during the loop, should now not be present in the cursor anymore. 
 
Please advise urgently....


connectivity with remote mysql
Fri, 25 Apr 2008 03:14:05 MDT
I am trying to run jsp page on remote server (Linux) and doing connectivity with mysql.
 

 
<%!
Connection conn=null;
PreparedStatement pst=null;
ResultSet rs=null;
 
%>
 

<%
try
{
 

Class.forName("org.gjt.mm.mysql.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://localhost/databasename?user=<username>&password=<password>");
System.out.println("driver connected");
}
catch(Exception ex)
{
 
System.out.println(ex);
}
 
%>
 
<%
String sql2="SELECT * FROM TABLENAME";
PreparedStatement pst=conn.prepareStatement(sql2);
rs=pst.executeQuer...


Doubt in Loading Driver
Fri, 25 Apr 2008 02:38:05 MDT
Hi Friends
 
 1) Please let me know what is difference between
 
 Class.formName("sun.jdbc.odbc.JdbcOdbcDriver");
 
 and 
 
 Driver d=new sun.jdbc.odbc.JdbcOdbcDriver()
 
 2) What is the purpose of registerDriver() method?
 

Thanks in advance
Kavitha


SQL server migration
Thu, 24 Apr 2008 06:48:02 MDT
hi,
We have machine where SQL 2005 server is installed.Atleast 3 web applications are running on it with data size 22GB in all. We need to migrate all data/tables/groups/users from this server to another server.On target server, SQL server 2005 will be installed.After that this migration activity needs to be carried out.what are options available to migrate to target server?
Microsoft migration tool? Any already existing stored procedure etc?which is preferred solution in such case? java program?
(There are no explicit stored procedures/triggers etc) database structure is quite simple.
 
Thanks for help
 
 :)


Error java.sql.SQLException: Exhausted Resultset
Wed, 23 Apr 2008 22:36:01 MDT
Hi....
 im trying to retrieve a row from oracle database but its giving me an error as Error java.sql.SQLException: Exhausted Resultset
when i select an item from jcombobox its giving me this error
the error is in the following block..........
please help me 
 

 private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) { 
 try
 {
 con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:MyDatas","scott","tiger");
 stmt=con.createStatement();
 String selected_id = (String)jComboBox1.getSelectedItem();
 stmt = con.createStatement();
 rs = stmt.ex...


cannot retrieve table from my java program
Wed, 23 Apr 2008 12:40:00 MDT
Hi..beginner in java programming...
i have written java pgm to update and delete records from frame.
i have created a column called 'r_code' in 'reason_code' table in oracle database. i can access all r_code data in jComboBox but it is giving me sqlException as Error java.sql.SQLException: ORA-01722: invalid number
 
im getting error in following block
 
 private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) { 
 try
 {
 con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:MyDatas","scott","tiger");
 stmt=con.createStatement();
 String selected_id = (String)jComboBox1.getSelec...