Java with mysql

if two tables r given, i want a code which should tell tat ,in which table foreign key is available.
so please kindly help out in this problem.
is there is any query or code avalible to find out which table as foreign key.

I don't know if this will have what you're looking for, but that kind of information is available with [url http://java.sun.com/j2se/1.5.0/docs/api/java/sql/DatabaseMetaData.html]DatabaseMetaData. You get it with [url http://java.sun.com/j2se/1.5.0/docs/api/java/sql/Connection.html#getMetaData()]Connection.getMetaData().
If you're not familiar with JDBC, see this tutorial:
http://java.sun.com/developer/onlineTraining/Database/JDBC20Intro/

Similar Messages

Can' t connect Java with MySQL

My goal is to connect Java with MySQL. I found many solutions on Internet, but I always get the same mistake:
SQLException: No suitable driver
SQLState: 08001
VendorError: 0MySQL works fine alone or with php.Only thing left me to think is that the installed versions are not compatible for this mysql-connector-java-5.0.4
I don't believe that could be a reason.
Installed versions are:
Apache Tomcat 5.5.20 Server
Apache HTTP Server 2.2.4
PHP 5.2.0
MySQL 5.2
jre 1.5.0_11
jdk1.5.0_11
Apache Tomacat JK2 connector Version: 1.2.20 File Name: mod_jk-apache-2.2.3.so
mysql-connector-java-5.0.4
I also set connector in class path: C:\mysql-connector-java-5.0.4;C:\mysql-connector-java-5.0.4\mysql-connector-java-5.0.4-bin.jar;C:\mysql-connector-java-5.0.4\src\com\mysql\jdbc
For installation I used manulas from:
http://apacheguide.org/jsp.php
http://doc.51windows.net/mysql/?url=/MySQL/ch23s03.html
Here is also a test code in java:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
   public class Connect
       public static void main (String[] args)
           Connection conn = null;
           try {
    conn =
       DriverManager.getConnection("jdbc:mysql://localhost/first_test" +
                                   "user=monty&password=greatsqldb");
    // Do something with the Connection
} catch (SQLException ex) {
    // handle any errors
    System.out.println("SQLException: " + ex.getMessage());
    System.out.println("SQLState: " + ex.getSQLState());
    System.out.println("VendorError: " + ex.getErrorCode());
   }i'm desperate, please help or tell me someone who'll know the answer.
Thank You in advance

hey buddy .. it seems yr code is wrong .. in getconnection () method u should also specify the port ,which u r not doing ...
the default port for MySQL is 3306 ... see below i am giving you a sample code ... its working fine .. and dont forget to put the MySQL driver jar path in to classpath and also copy the jar into common/lib folder of your tomcat ....
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class MySQLConnectionTest {
     public static void main(String[] args) {
new MySQLConnectionTest().connTest();
public void connTest() {
          String tableName = "portfolio"; //change as per setting
          String hostName = "10.81.9.39"; // please change for the target database ip or hostname
          String dbPort = "3306"; //change if not using the default
          String dbName = "tradingsystem"; //change as per the given DB name
          String username = "root"; //change as per setting
          String password = "password"; //change as per setting
          System.out.println("before try");
          Double data=0.0;
     Double data1=0.0;
          try {
Class.forName("org.gjt.mm.mysql.Driver");
               System.out.println("before driver manager");
Connection conn = DriverManager.getConnection("jdbc:mysql://"+hostName+":"+dbPort+"/"+dbName, username, password);
String query1 = "select * from "+tableName+" where User_id='trader1' and Stock_Type='Equity'";
System.out.println("quesry1="+query1);
Statement stmt = conn.createStatement();
ResultSet rs1 = stmt.executeQuery(query1);
while(rs1.next())
     System.out.println("hiiiiii for rs1");
     System.out.println(rs1);
     Quantity=(Integer)rs1.getObject(5);
     MarketPrice=(Double) rs1.getObject(8);
     data=Quantity*MarketPrice;
     data1+=data;
     System.out.println("data1="+data1);
     i=0;
rs1.close();
stmt.close();
conn.close();
} catch (ClassNotFoundException e) {
e.printStackTrace(System.err);
} catch (SQLException e) {
e.printStackTrace(System.err);
i hope it will work for u...
cheers,

Date Problem in Java with MySql

Hello
I am using Java with Mysql.I want to enter date in some in my format(YYYY:MM:DD:HH:MM:SS), this thing i have convert using format class and format class return date in String and iwwnat to insert this value in MySQL Table,So i want to know how can i convert String value in Date for Mysql is their inbuild function for converting string into date in mysql.
Regards
Anupam S

Use PreparedStatement and SimpleDateFormat classes
http://onesearch.sun.com/search/onesearch/index.jsp?qt=%2BPreparedStatement+%2BSimpleDateFormat+&qp=siteforumid%3Ajava48&chooseCat=allJava&col=developer-forums&site=dev

Java with MYSQL in Linux

i am using JSP in Linux Platform. when i connected to mysql with mysql driver for odbc by using the following code,
import java.sql.*;
public class TestMysql
public static void main(String args[]) {
try {
          Connection con;
          String connStr = "jdbc:mysql://localhost/test?user=root&password=mysql";
          Class.forName( "com.mysql.jdbc.Driver" ).newInstance();
          System.out.println("OK");
          con = DriverManager.getConnection( connStr );
          System.out.println("Again OK");
catch( Exception x )
x.printStackTrace();
i got the following exception
OK
java.sql.SQLException: Error during query: Unexpected Exception: java.io.CharConversionException message given: null
Nested Stack Trace:
** BEGIN NESTED EXCEPTION **
java.io.CharConversionException
STACKTRACE:
java.io.CharConversionException
at gnu.gcj.convert.Input_iconv.read(char[], int, int) (/usr/lib/libgcj.so.5.0.0)
at java.lang.String.init(byte[], int, int, java.lang.String) (/usr/lib/libgcj.so.5.0.0)
at java.lang.String.String(byte[], int, int, java.lang.String) (/usr/lib/libgcj.so.5.0.0)
at com.mysql.jdbc.SingleByteCharsetConverter.SingleByteCharsetConverter(java.lang.String) (Unknown Source)
at com.mysql.jdbc.SingleByteCharsetConverter.initCharset(java.lang.String) (Unknown Source)
at com.mysql.jdbc.SingleByteCharsetConverter.getInstance(java.lang.String, com.mysql.jdbc.Connection) (Unknown Source)
at com.mysql.jdbc.Connection.getCharsetConverter(java.lang.String) (Unknown Source)
at com.mysql.jdbc.StringUtils.getBytes(java.lang.String, java.lang.String, java.lang.String, boolean, com.mysql.jdbc.Connection) (Unknown Source)
at com.mysql.jdbc.Buffer.writeStringNoNull(java.lang.String, java.lang.String, java.lang.String, boolean, com.mysql.jdbc.Connection) (Unknown Source)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(com.mysql.jdbc.Statement, java.lang.String, java.lang.String, com.mysql.jdbc.Buffer, int, com.mysql.jdbc.Connection, int, int, boolean, java.lang.String, boolean) (Unknown Source)
at com.mysql.jdbc.Connection.execSQL(com.mysql.jdbc.Statement, java.lang.String, int, com.mysql.jdbc.Buffer, int, int, boolean, java.lang.String, boolean, boolean) (Unknown Source)
at com.mysql.jdbc.Connection.configureClientCharacterSet() (Unknown Source)
at com.mysql.jdbc.Connection.initializePropsFromServer() (Unknown Source)
at com.mysql.jdbc.Connection.createNewIO(boolean) (Unknown Source)
at com.mysql.jdbc.Connection.Connection(java.lang.String, int, java.util.Properties, java.lang.String, java.lang.String) (Unknown Source)
at com.mysql.jdbc.NonRegisteringDriver.connect(java.lang.String, java.util.Properties) (Unknown Source)
at java.sql.DriverManager.getConnection(java.lang.String, java.util.Properties) (/usr/lib/libgcj.so.5.0.0)
at java.sql.DriverManager.getConnection(java.lang.String) (/usr/lib/libgcj.so.5.0.0)
at TestMysql.main(java.lang.String[]) (Unknown Source)
** END NESTED EXCEPTION **
at com.mysql.jdbc.Connection.execSQL(com.mysql.jdbc.Statement, java.lang.String, int, com.mysql.jdbc.Buffer, int, int, boolean, java.lang.String, boolean, boolean) (Unknown Source)
at com.mysql.jdbc.Connection.configureClientCharacterSet() (Unknown Source)
at com.mysql.jdbc.Connection.initializePropsFromServer() (Unknown Source)
at com.mysql.jdbc.Connection.createNewIO(boolean) (Unknown Source)
at com.mysql.jdbc.Connection.Connection(java.lang.String, int, java.util.Properties, java.lang.String, java.lang.String) (Unknown Source)
at com.mysql.jdbc.NonRegisteringDriver.connect(java.lang.String, java.util.Properties) (Unknown Source)
at java.sql.DriverManager.getConnection(java.lang.String, java.util.Properties) (/usr/lib/libgcj.so.5.0.0)
at java.sql.DriverManager.getConnection(java.lang.String) (/usr/lib/libgcj.so.5.0.0)
at TestMysql.main(java.lang.String[]) (Unknown Source)
i have the database, hello.
The same code works well in Windows, But in Linux, the above exception.
By using the username root and password mysql , i can connect to mysql directly from the mysql prompt.
Pls help me..
I have already put the query 'access denied problem in Mysql' some day before. from the reply, i made some changes in user table(ie. set the password for [email protected].).After this change, this new Exception came..
The structure of my mysql.user table is
#     host                         user          password
1     localhost                    root          68d4f47c49a579c9
2     localhost.localdomain          root          68d4f47c49a579c9
3     localhost.localdomain
4     localhost
Pls help me.
Edited by: SUMESHBABU_R on Sep 30, 2007 11:36 PM

Well, at least the trace tells me that this issue is to be tracked back to the core of the MySQL JDBC driver and the Linux's implementation of JVM. It might be worth the effort to post this issue at their website/forum/issuetracker. It might also be worth the effort to tryout the newer MySQL JDBC driver 5.1, as it is written specific for JDK 6.0 (while MySQL JDBC driver 5.0 is targeted at JDK 5.0).

Hoe to connect java with mysql 5.0

I have installed the new Os. in that RHE-5 Os is there, now I want that java can connect ot mysql but , its not able connect with mysql so please guide me.

1) download mysql connector/J JDBC driver from mysql.com
2) put the driver jar somewhere where you can put it in the classpath of your application
3) use proper setup code to connect to the database (search google, tons of examples)
If at any step you have no clue what I am talking about, you need a good book to help you further.

Problems conecting java with mysql

Hi, im workin' with mysql-connector-java-3.1.12 and it work on debug runtime but not when i access the .jar of the project.
the code of conection is:
try
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection(url,login,password);
con.setAutoCommit(false);
catch (Exception e)
JOptionPane.showMessageDialog(null,"error en " + e.getMessage());
there is no problems with code, it works!!, but i don't know what to do about of conection in the .jar
I apreciate some help with this, Thankkkssss!!!

Hi, im workin' with mysql-connector-java-3.1.12 and
it work on debug runtime but not when i access the
.jar of the project.Huh?
the code of conection is:
try
lass.forName("com.mysql.jdbc.Driver").newInstance();
con =
DriverManager.getConnection(url,login,password);
con.setAutoCommit(false);This is probably wrong. Unnecessary in this case - you aren't doing any writes.
catch (Exception e)
OptionPane.showMessageDialog(null,"error en " +
e.getMessage());This is foolish code. You don't need Swing or a dialog box. You're printing less information than is available. Better to print the entire stack trace.
is no problems with code, it works!!, Plenty of problems, really, regardless of whether it "works".
You don't post your URL. That would help.
but i don't
know what to do about of conection in the .jar
I apreciate some help with this, Thankkkssss!!!Put in the CLASSPATH, of course. NOT a system environment variable, either. javac.exe and java.exe ignore it. Use the -classpath option.
%

Connectivity java with mySql

Hi
Can any one tell me how should i connect my java application with mySql database here is the small code which i written.
import java.sql.*;
class tryjdbc
     public static void main(String[] args) throws Exception
     try
          Class.forName("com.mysql.jdbc.Driver").newInstance();
          String connectionURL = "jdbc:mysql://localhost:3306/learn?user=root;password=";
          Connection connection = DriverManager.getConnection(connectionURL, "root", "");
          Statement statement = connection.createStatement();
          ResultSet rs = statement.executeQuery("Select ecode from emp");
          while (rs.next())
               System.out.println(rs.getString("ecode"));
          catch (Exception e){
               System.out.println(e);
Can any one please tell me the error there is no eror in compiling but at run time it gives error
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
Thanks in advance
Dhiraj

Hi Dhiraj,
String connectionURL = "jdbc:mysql://localhost:3306/learn?user=root;password=";
Connection connection = DriverManager.getConnection(connectionURL, "root", "");
It seems to be your trying to pass twice of your properties details. One from through URL and another from by pasing the parameters on getConnection() method. Better to avoid to use two place in same application. and one more thing I want to confirm r u using "stable" Driver or "alpha" Driver.
Raju

JAVA with MYSQL problem

i am using jdk1.6.0_02,apache tomcat 5.5.23 ,mysql integrated with redhat linux EE 4 and.mysql connector java 5.0.7.bin.jar.
look at the the following java program
import java.sql.*;
public class TestMysql
public static void main(String args[])
try
String driver = "com.mysql.jdbc.Driver";
Class.forName( driver );
String url = "jdbc:mysql://localhost/test";
DriverManager.getConnection( url, "root", "mysql" );
catch( Exception x )
{ x.printStackTrace();
i got the following exception
java.sql.SQLException: Access denied for user 'root'@'localhost.localdomain' (us *** password:
YES)
at com.mysql.jdbc.SQLError.createSQLException(java.lang.String, java.lang.Str ***, int)
(Unknown Source)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(int) (Unknown Source)
at com.mysql.jdbc.MysqlIO.checkErrorPacket() (Unknown Source)
at com.mysql.jdbc.MysqlIO.secureAuth411(com.mysql.jdbc.Buffer, int, java.lang .String,
java.lang.String, java.lang.String, boolean) (Unknown Source)
at com.mysql.jdbc.MysqlIO.doHandshake(java.lang.String, java.lang.String, jav a.lang.String)
(Unknown Source)
at com.mysql.jdbc.Connection.createNewIO(boolean) (Unknown Source)
at com.mysql.jdbc.Connection.Connection(java.lang.String, int, java.util.Prop erties,
java.lang.String, java.lang.String) (Unknown Source)
at com.mysql.jdbc.NonRegisteringDriver.connect(java.lang.String, java.util.Pr operties)
(Unknown Source)
at java.sql.DriverManager.getConnection(java.lang.String, java.util.Propertie s)
(/usr/lib/libgcj.so.5.0.0)
at java.sql.DriverManager.getConnection(java.lang.String, java.lang.String, j
ava.lang.String) (/usr/lib/libgcj.so.5.0.0)
at Connect.main(java.lang.String[]) (Unknown Source)
access denied problem. but the user name and password are correct. i can login to mysql by using
the same username and password.
but when connecting through java , i can't ? what is the problem?
can u help me.?
actually i am working in JSP. and when i got this problem, i created a small java program for testing.
here i am submitting the java program.

friend please put your code inside
// your code goes here it will more readable and other can solve it better.
==================
and your problem tells that you must set access permission inside
mySQL server.
or try with creating new User with password.
EnJOY.
Ghanshyam
Edited by: Ghanshyam on Sep 28, 2007 4:13 PM

How make installer java with mySQL database

How do I create a java installer for windows, because I have a project that uses mySQL database.
Anyone please help me....

If you have eg. a desktop application which needs a database, but don't have/ need a database server, which is accessed by several instances of the application (which seems to be the case, otherwise you wouldn't want to install it along with the application), consider an embedded database such as Apache Derby/ Java DB.
Then all you need is to ship some jars and make sure they are on the classpath.
If you're using JPA and generate the DB schema, then switching DB vendors should be quite easy. Just reconfigure your persistence.xml.

Need help on java with mysql...

I want to make application that will use mysql as database. I have downloaded mysql connector j but i'm confuse about how to install it to jdk. for reference, i'm using windows xp, phptriad that have mysql 4.1.
After that, how do I connect my application to the database?
please help...
Thanks before...

Have a look at this tutorial:
http://java.sun.com/docs/books/tutorial/jdbc/index.html

Using java with mysql JDBC

Hello
I'm trying to write a program which reads in tab-delimeted text files and then stores the results in a mysql database. The files are roughly 20,000 lines long and can have up to 10 columns, so for the biggest files I have 200,000 pieces of data to be stored seperately in the database.
I'm currently using the readLine() method of bufferedreader, then using the split function to seperate the string into tokens. The problem is that it seems to be very slow. It is a lot of information, and im not running it on a very fast machine, but even so im sure there must be a more efficient way of acheiving this.
Here's some of my code:
BufferedReader in = new BufferedReader(new FileReader("test.res"));
while((result = in.readLine()) != null) {
result = in.readLine();
aLine = result.split("\t");
stmt.executeUpdate("INSERT INTO test(words)" + "values('" + aLine[0] +"')");
stmt.executeUpdate("INSERT INTO test(words)" + "values('" + aLine[1] +"')");
stmt.executeUpdate("INSERT INTO test(words)" + "values('" + aLine[2] +"')");
stmt.executeUpdate("INSERT INTO test(words)" + "values('" + aLine[3] +"')");
stmt.executeUpdate("INSERT INTO test(words)" + "values('" + aLine[4] +"')");
stmt.executeUpdate("INSERT INTO test(words)" + "values('" + aLine[5] +"')");
stmt.executeUpdate("INSERT INTO test(words)" + "values('" + aLine[6] +"')");
stmt.executeUpdate("INSERT INTO test(words)" + "values('" + aLine[7] +"')");
stmt.executeUpdate("INSERT INTO test(words)" + "values('" + aLine[8] +"')");
stmt.executeUpdate("INSERT INTO test(words)" + "values('" + aLine[9] +"')");
I would appreciate any advice thanks.
PS this is the first time ive tried anything like this so im probably missing something obvious.

Form the example you have chosen it seems to me, that your table only has one column (words) and that you have multiple value entries for that column in one line of your text file ?!
That is strange. Normaly I would assume (like the other answers indicate) that you have several columns and that each line in your text file has n values each for a different column.
Have look at PreparedStatement.
// the name of your connection is con, you have six columns named col1 to col6 and six entries per line, All six are strings...
PreparedStatement pstmt = con.prepareStatement("insert into test (col1 , col2 , col3,col4,col5,col6) values( ? , ? , ? , ? , ? , ?)") ;
BufferedReader in = new BufferedReader(new FileReader("test.res"));
while((result = in.readLine()) != null) {
   result = in.readLine();
   aLine = result.split("\t");
   for (int i = 0 ; i < 6 ; i++) {
       pstmt.setString((i+1),aLine) ;
pstmt.executeUpdate() ;
But this is still not the fastest approach. MySQL supports bulk imports
Have look at this feature. Maybe the fastest way is to 'convert' the textfile into something like a MySQL dump an than process it using it the MySQL import features.

Create a simple connection with mysql

hello
my name is edvanio i am from brazil.
i'd like to connect one program in Java with mysql for insert, delete and update one simple base ex. teste with nome and fone.
thank , bye

here's a couple of sites
http://www.javacoding.net/articles/technical/java-mysql.html
http://www.developer.com/java/data/article.php/3417381
I recently installed MySQL (just to see if I could get a working program to run)
these were the steps
1. downloaded MySQL
2. downloaded the connector file
3. unzipped/installed MySQL
4. unzipped the connector file
mysql-connector-java-3.0.17-ga-bin.jar
copied the jar file into this directory
C:\Program Files\Java\jdk1.5.0_03\jre\lib\ext
5. opened MySQL, using the code from Gamelan
create the db JunkDB
created the user, permissions, password
6. combined the code from both sites (code follows)
and it worked OK
import java.sql.*;
class MySQL_Test
public MySQL_Test() throws Exception
    testDriver();
    Connection con = getConnection();
    executeUpdate(con,"CREATE TABLE test(id int,text varchar(20))");
    executeUpdate(con,"insert into test(id,text) values (1,'first entry')");
    executeUpdate(con,"insert into test(id,text) values (2,'second entry')");
    executeUpdate(con,"insert into test(id,text) values (3,'third entry')");
    executeQuery(con,"select * from test");
    executeUpdate(con,"drop table test");
    con.close();
protected void testDriver() throws Exception
    try
      Class.forName("com.mysql.jdbc.Driver");
      System.out.println("MySQL Driver found");
    catch(ClassNotFoundException cnfe)
      System.out.println("OOPs - MySQL Driver nowhere to be found");
      throw (cnfe);
protected Connection getConnection() throws Exception
    String url = "";
    try
      url = "jdbc:mysql://localhost:3306/JunkDB";
      Connection con = DriverManager.getConnection(url,"auser","drowssap");
      System.out.println("Connection OK");
      return con;
    catch(SQLException sqle)
      System.out.println("OOPs - No Connection");
      throw (sqle);
protected void executeUpdate(Connection con,String sqlStatement) throws Exception
    try
      Statement s = con.createStatement();
      s.execute(sqlStatement);
      s.close();
    catch(SQLException sqle)
      System.out.println("OOPs - error executing statement");
      throw (sqle);
protected void executeQuery(Connection con,String sqlStatement) throws Exception
    try
      Statement s = con.createStatement();
      ResultSet rs = s.executeQuery(sqlStatement);
      while(rs.next())
        String id = (rs.getObject("id").toString());
        String text = (rs.getObject("text").toString());
        System.out.println("Found record "+id+" "+text);
      rs.close();
    catch(SQLException sqle)
      System.out.println("OOPs - error executing resultset");
      throw (sqle);
public static void main(String[] args)
    try
      new MySQL_Test();
    catch(Exception e){e.printStackTrace();}
}

[JAVA] problems with java and mysql

Hi, i have already installed php + mysql and work's them fine, but i want to install java + mysql. I have downloaded eclipse and installed its, that's ok. I have download tomcat and, that's ok. I have download module jconnector and have copied the file .jar in the java home and set classpath. Run and compiled this source that's ok. At runtime the program ask: Impossible connection at the database, why ? It's the source of program:
[JAVA]
import java.sql.*;
public class connessione {
private String nomeDB; // Nome del Database a cui connettersi
private String nomeUtente; // Nome utente utilizzato per la connessione al Database
private String pwdUtente; // Password usata per la connessione al Database
private String errore; // Raccoglie informazioni riguardo l'ultima eccezione sollevata
private Connection db; // La connessione col Database
private boolean connesso; // Flag che indica se la connessione � attiva o meno
public connessione(String nomeDB) { this(nomeDB, "", ""); }
public connessione(String nomeDB, String nomeUtente, String pwdUtente) {
this.nomeDB = nomeDB;
this.nomeUtente = nomeUtente;
this.pwdUtente = pwdUtente;
connesso = false;
errore = "";
// Apre la connessione con il Database
public boolean connetti() {
connesso = false;
try {
// Carico il driver JDBC per la connessione con il database MySQL
Class.forName("com.mysql.jdbc.Driver");
// Controllo che il nome del Database non sia nulla
if (!nomeDB.equals("")) {
// Controllo se il nome utente va usato o meno per la connessione
if (nomeUtente.equals("")) {
// La connessione non richiede nome utente e password
db = DriverManager.getConnection("jdbc:mysql://localhost/" + nomeDB);
} else {
// La connessione richiede nome utente, controllo se necessita anche della password
if (pwdUtente.equals("")) {
// La connessione non necessita di password
db = DriverManager.getConnection("jdbc:mysql://localhost/" + nomeDB + "?user=" + nomeUtente);
} else {
// La connessione necessita della password
db = DriverManager.getConnection("jdbc:mysql://localhost/" + nomeDB + "?user=" + nomeUtente + "&password=" + pwdUtente);
// La connessione � avvenuta con successo
connesso = true;
} else {
System.out.println("Manca il nome del database!!");
System.out.println("Scrivere il nome del database da utilizzare all'interno del file \"config.xml\"");
System.exit(0);
} catch (Exception e) { errore = e.getMessage(); }
return connesso;
public static void main(String [] args) {
connessione a=new connessione("asta","root","");
if(a.connetti())
System.out.println("Connessione al database riuscita");
else
System.out.println("Connessione al database non riuscita");
[JAVA]

With this line I always pass the username and password also:
db = DriverManager.getConnection("jdbc:mysql://localhost/" + nomeDB);
db = DriverManager.getConnection("jdbc:mysql://localhost/" + nomeDB, useName, Password);
Make sure you create your users in MySQL with the correct permissions

The performance of management system with Java and MySQL

Hi all,
I want to develop one management application with Java and MySQL. However I am not sure which is a good way to design the system. The system has to deal with customers' data in the database.
Should I create objects for every customers when application starts so that I do not need to access to the database often? Or
Should I access to the database everytime the user want to deal with customer's data?
Welcome for any suggestion.
Thank you
Pat

Hi
i i think u should go through MVC model or use connection pooling

Can not do JPA/Hibernate ... Reverse Engineering with MySQL

Hello,
I'm using MyEclipse 7.1.1 and MySQL 5.1.34. The MySQL connector with java is mysql-connector-java-5.1.7-bin. I tried so many time to generate Hibernate/JPA class by MyEcipse but it still did not work. Here below are my error log (which i copied from workspace error log):
!ENTRY org.eclipse.core.jobs 4 2 2009-05-29 22:07:20.709 !MESSAGE An internal error occurred during: "Generating Artifacts". !STACK 0 java.util.NoSuchElementException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:844) at java.util.HashMap$ValueIterator.next(HashMap.java:871) at com.genuitec.eclipse.hibernate.tool.MESingleClassExporter.doStart(MESingleClassExporter.java:59) at com.genuitec.eclipse.hibernate.tool.hbm2x.VAbstractExporter.start(VAbstractExporter.java:97) at com.genuitec.eclipse.hibernate.wizards.GenerateArtifactsJob$3.execute(GenerateArtifactsJob.java:582) at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:64) at org.hibernate.console.ConsoleConfiguration.execute(ConsoleConfiguration.java:95) at com.genuitec.eclipse.hibernate.wizards.GenerateArtifactsJob.run(GenerateArtifactsJob.java:417) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
These information below are my system information that i copied from Myeclipse Installation Summary:
*** Date: Friday, May 29, 2009 10:37:27 PM CDT ** System properties: OS=MacOSX OS version=10.5.7 Java version=1.5.0_16 *** MyEclipse details: MyEclipse Enterprise Workbench Version: 7.1.1 Build id: 7.1.1-20090310 *** Eclipse details: MyEclipse Enterprise Workbench Version: 7.1.1 Build id: 7.1.1-20090310 Eclipse Platform Version: 3.4.1.r341_v20080731-9I96EiDElYevwz-p1bP5z-NlAaP7vtX6Utotqsu Build id: M20080911-1700 Eclipse Java Development Tools Version: 3.4.1.r341_v20080709-0800-7o7tEAfEF_U5qyUgrb2HAp539P97 Build id: M20080709-0800 Eclipse Graphical Editing Framework GEF Version: 3.4.1.v20080806-67718083A56B4H2A3213573 Build id: 200809101400 Eclipse RCP Version: 3.4.100.r341_v20080814-989JESIEdAciFYfkZZsBfSwQ2341 Build id: M20080703-0800 Eclipse Plug-in Development Environment Version: 3.4.1.r341_v20080731-7T7U0E9mlRIuGUYviF_VP Build id: M20080703-0800 Eclipse startup command=-os macosx -ws carbon -arch x86 -showsplash -launcher /Library/Genuitec/MyEclipse 7.1 1/myeclipse.app/Contents/MacOS/myeclipse -name Myeclipse --launcher.library /Library/Genuitec/MyEclipse 7.1 1/myeclipse.app/Contents/MacOS//../../../../Common/plugins/org.eclipse.equinox.launcher.carbon.macosx_1.0.101.R34x_v20080731/eclipse_1115.so -startup /Library/Genuitec/MyEclipse 7.1 1/myeclipse.app/Contents/MacOS/../../../../Common/plugins/org.eclipse.equinox.launcher_1.0.101.R34x_v20080819.jar -clean -configuration ../../../configuration -keyring /Users/lamnguyen/.eclipse_keyring -consoleLog -showlocation -vm /System/Library/Frameworks/JavaVM.framework
Here is my config file:
<?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <persistence-unit name="NDProcessorPU" transaction-type="RESOURCE_LOCAL"> <provider>oracle.toplink.essentials.PersistenceProvider</provider> <properties> <property name = "toplink.jdbc.driver" value = "com.mysql.jdbc.Driver"/> <property name = "toplink.jdbc.url" value = "jdbc:mysql://localhost/netdirs?autoReconnect=true"/> <property name = "toplink.jdbc.user" value = "root"/> </properties> </persistence-unit> </persistence>
Please help me to resolve this problem. I tried so many ways such as: change others mysql connector driver version, refresh, re-install myeclipse... Someone who have any solutions please help me.
Thank you!

perhaps posting this question in a forum for MyEclipse would help?
Or even Hibernate?
None of these are JDBC related issues really, but probably configuration or setup of those.
And while I could spend time noting that it is an eclipse error and thus some problem there in the first place...

Java with mysql

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