Irish (Gaeilge) Character preservation from MySQL
(Sorry if this is the wrong forum..)
I'm building a web application which uses the Irish language. This is my first time working on a java program that uses another language other than English so I need to teach my self about character encoding and charset issues.
Specifically I need to retrieve information from the database. I've got data in a MySQL database that is in Irish, but when I retrieve a column using
rs.getString("column_name")("rs" being an instance of the java.sql.ResultSet) and print that to a log or the console I can see that it's garbled. The Irish fada is being lost and something else is appearing.
If anyone can point me into a direction where I can do some relevant reading or provide pointers I'd be grateful. Even posting simple phrases or helpful terms for a Bing/Google search would be helpful.
Thank you very much for your reply
Kayaman wrote:
As a Finn I'm familiar with the problem.
As there might often be applications localized into Finnish, you can never know if your output of "ärränkierränympäriorren" will display nicely.That displays nicely right there :o)
In your particular case you need to make sure of (at least) 2 things.
First, make sure that the database is set to use an appropriate encoding (UTF-8 will do nicely), otherwise the data will be garbled already in the db.Okay I've updated the character set of the database
ALTER DATABASE mydatabase CHARACTER SET utf8;
Secondly, the output. If the console or whatever output you're using (such as writing to a file) assumes that the data is in, let's say ASCII, the data will be garbled in the output phase.
Okay I've included an encoding setting into the log4j properties file.
log4j.appender.A1.Encoding=UTF-8Unfortunately I'm still not sure what is happening. The text that appears in the log file remains garbled but now it's garbled differently from before.
When I view the table with data in the mysql command line client program, the text appears as it should, with the fada used as it should be. But viewing the data from Java is not working.
Of course if your data is travelling a long way from the db to the output, there's a chance it'll become garbled in between. But that's a bit less likely.Right now I'm just working with it locally.
>
I'm sure Google will find you something like "everything you need to know about character encoding" or such.I'll try this.
Tá sé seo deacair. :o(
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JimI am currently migrating from MySql to Derby. Dear God, why?I am using the embedded functionality.
>
I have been developing a MRPII package for a whilenow
MRP as in "manufacturing resource planning"?Yes
>
and whilst my classes worked with MySql I am
finding difficulty with implementing them using
Derby.That suggests that your Java code relies too heavily
on MySQL features. You didn't make your code
portable enough.
I have developed a GUI interface for MRPIIfunctions
and use a Database Interface class to connect tothe
database.
The Database Interface class gives me thecapability
of reading and writing from a database.
I extend this capability to sub classes ie part,
customers, suppliers, work orders.
The problem I have is with the ' "+standardCost+"'
type statements. In MySql, the database engine
recognises that the standard cost variable is a
double though using Derby I get the following
Errors.Right - you're counting on something that might not
be true for all databases. MySQL appears to be doing
an implicit conversion from string to double. Bad
idea.
SQL Exception: Columns of type 'DOUBLE' cannothold
values of type 'CHAR'. In Save Data errorcode30000
SQL Exception: Columns of type 'DOUBLE' cannothold
values of type 'CHAR'. In Save Data errorcode30000
Executed statement INSERT INTO stock
VALUES('BUDGET500','A1',
'100.0','50.0','1.0','100.0')
Executed statement INSERT INTO part
VALUES('BUDGET500', 'PENTIUM','76.0',
'86.0','EACH','MP','7','33')Do you use PreparedStatements to escape strings and
dates for you? If not, you're in for a bumpy ride.
The only solution I see is giving each subclass of
Database Interface the individual capabilitywithin
that class to connect to the database and use
prepared statements.I would not have a single database interface. Each
class has its own requirements. How can a single
class know about all of them? Better to break your
persistence layer into several interaces, one per
persistent class.That is what I thought
>
Does anyone know if Derby has the capability of
processing the updates using a similar format as
shown in my code.I think your code is in trouble, Jim.Probably so, thought a redesign is not so much of a problem now as I am a bit more experienced than when I started out.
>
You don't use prepared statements, which would help
with your portability issues.
You have SQL embedded in the objects. I'd move it
out into a separate persistence layer.
You might want to read about Hibernate, an
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* @author James Charles
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private String[][] results = new String[0][0];
private int columnCount = 0;
private int rowCount = 0;
private boolean resultsExist = false;
Object data[][];
private JTable table;
public void setDatabase(String database){
this.database = database;
public void setQuery(String query){
this.query = query;
public void setUpdate(String update){
this.update= update;
public void saveData(){
try{
Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
String sourceURL = new String("jdbc:derby:" + this.database);
Connection databaseConnection = DriverManager.getConnection(sourceURL);
Statement statement = databaseConnection.createStatement();
statement. executeUpdate(this.update);
databaseConnection.close();
} // end of try
catch(ClassNotFoundException cnfe){
System.err.println(cnfe);
catch(SQLException sqle){
System.err.println(sqle + " In Save Data error code" + sqle.getErrorCode());
System.out.println("Executed statement " + this.query);
catch(InstantiationException ie){
System.err.println(ie);
catch(IllegalAccessException iae){
System.err.println(iae);
public String getDatabase(){
return this.database;
public String getQuery(){
return this.query;
public void setResults(){
try{
Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
String sourceURL = new String("jdbc:derby:" + this.database);
Connection databaseConnection = DriverManager.getConnection(sourceURL);
Statement statement = databaseConnection.createStatement();
ResultSet thisResult = statement.executeQuery(this.query);
databaseConnection.commit();
System.out.println("Executed statement");
convertToArray(thisResult);
databaseConnection.close();
} // end of try
catch(ClassNotFoundException cnfe){
System.err.println(cnfe);
catch(SQLException sqle){
System.err.println(sqle);
catch(InstantiationException ie){
System.err.println(ie);
catch(IllegalAccessException iae){
System.err.println(iae);
public void convertToArray(ResultSet resultsIn) throws SQLException{
this.resultsExist = false;
String[] columnNames = new String[0];
Vector dataRows = new Vector();
ResultSetMetaData metadata = resultsIn.getMetaData();
this.columnCount = metadata.getColumnCount();
columnNames = new String[this.columnCount];
for(int i = 0; i < this.columnCount; i++)
columnNames[i] = metadata.getColumnLabel(i+1);
String[] rowData = new String[this.columnCount]; // Stores one row
while(resultsIn.next()){ // For each row...
rowData = new String[this.columnCount]; // create array to hold thedata
for(int i = 0; i < this.columnCount; i++)// For each column
rowData[i] = resultsIn.getString(i+1); // retrieve the data item
dataRows.addElement(rowData); // Store the row in the vector
this.results= new String[dataRows.size()][this.columnCount];
this.data= new Object[dataRows.size()][this.columnCount];
for(int column = 0; column < this.columnCount; column++)
for(int row = 0; row < dataRows.size(); row++){
this.results[row][column] = ((String[])(dataRows.elementAt(row)))[column];
this.data[row][column] = ((String[])(dataRows.elementAt(row)))[column];
this.rowCount = dataRows.size();
try{
if (results[0][0].equals(null)){ this.resultsExist = false;} //ckecks results
else {this.resultsExist = true;}
catch (ArrayIndexOutOfBoundsException e){
System.out.println(e + "in catch");
this.resultsExist = false;
System.out.println("Value of exists in catch = " + this.resultsExist);
}// end of set results
public JTable getTable(Object[] columnNames) {
table = new JTable(data, columnNames);
return table;
public int getColumnCount(){
return this.columnCount;
public int getRowCount(){
return this.rowCount;
public String getData(int row, int column){
return this.results[row][column];
public boolean doResultsExist(){
return this.resultsExist;
} // end of database InterfaceI developed this code about a year ago and maybe it is time to simplify it.
With MySql I could create an instance of Database Interface or use one of its subclasses and perform any function on the database by calling its methods.
maybe it is time for a redesign!
thanks
jim -
Error while importing the tables from MySQL using the data source connection
Hi,
I am trying to import tables from MySQL into Powerpivot using the data source connection, if use the import using the Query option its working fine but not with the select list of table option.
when i click on the select list of tables option, i get the below error after selecting all the tables to be imported:
OLE DB or ODBC error.
An error occurred while processing table 'XXXXXXXXXX'.
The current operation was cancelled because another operation in the transaction failed.Hi Bharat17an,
Please provide the detail information when create the MySQL connection in your PowerPivot model. Here is a good article regarding "how to Use MySQL and Microsoft PowerPivot Together" for your reference, please see:
http://www.datamensional.com/2011/09/how-to-use-mysql-and-microsoft-powerpivot-together-2/
If this issue still persists, please help to collection windows event log information. It maybe helpful for us to troubleshoot this issue.
Regards,
Elvis Long
TechNet Community Support -
Unable to migrate table, character set from WE8MSWIN1252 to AL32UTF8
Hi,
On our source db the character set is AL32UTF8
On our own db, we used the default character set of WE8MSWIN1252 .
When migrating one of the table, we get an error of this: ORA-29275: partial multibyte character
So in to alter our character set from WE8MSWIN1252 to AL32UTF8, we get this error:
ALTER DATABASE CHARACTER SET AL32UTF8
ERROR at line 1:
ORA-12712: new character set must be a superset of old character set
I would sure not like to reinstall the db and migrate the tables again. Thanks.See this related thread - Re: Want to change characterset of DB
You can use the ALTER DATABASE CHARACTER SET command in very few cases. You will most likely have to recreate the database and re-migrate the data.
HTH
Srini -
How to fetch data from Mysql with SSL.
I am using jdk1.5 and mysql 5.0.
How to fetch data from Mysql with SSL
I am using url = jdbc:mysql://localhost/database?useSSL=true&requireSSL=true.
It shows error. how to fetchI have created certificate in mysql and checked in mysql.
mysql>\s
SSL: Cipher in use is DHE-RSA-AES256-SHA
but through ssl how to fetch data in java. -
Problems while migrating from mySql DB to oracle DB
Hi All,
I'm using sql developer tool to migrate from MySql DB to oracle DB. I followed the below steps.
1) I've created oracle and mysql connections successfully.
2) I've captured Mysql data and I'm able to see the captured model in ' Captured Models ' window. After that right clicked on the captured model and selected ' Set Data Mapping'. Selected ' apply ' button without changing anything. After that I've right clicked on the captured model and selected ' Convert to Oracle Model ' . It has shown the converting process. After some time it has shown conversion completed successfully.
But converted model is not visible in ' Converted Models ' window.
Can anyone kindly assist on how to migrate from MySql Db to Oracle DB?
Thanks,
Saty.Hi,
We did mysql to oracle migration some time back and played with workbench tool and many other softwares available.
However our experience was not so good with these tools, each tool had its own limitation and was not able to migrate 100% data. Even the speed of migration was too slow which would have violated our production SLAs.
So after spending a month with these tools we finally decided to create our own scripts for data migration. We used tools like TOAD and SQL Yok to create the DDL for the tables and other DB objects.
For the data migration we downloaded the mysql data in flat files and used sql loader to upload the same data in oracle. Even if this was a time consuming activity but this resulted in 100% data migration with no record getting failed and the time taken for this activity was around 6 Hrs in comparison to time of 24-28 Hrs that the workbench tool took.
Amar -
Best practice for loading from mysql into oracle?
Hi!
We're planning migrating our software from mysql to oracle. Therefore we need a migration path for moving the customer's data from mysql to oracle. The installation and the data migration/transfer have to run onto different customer's enviroments. So migration ways like installing the oracle gateway and connect for example via ODBC to mysql are no option because the installation process gets more complicated... Also the installation with preconfigured oracle database has to fit on a 4,6 GB dvd...
I would prefer the following:
- spool mysql table data into flat files
- create oracle external tables on the flat files
- load data with insert into from external tables
Are there other "easy" ways of doing migrations or what do you think about the prefered way above?
Thanks
MarkusHi!
Didn't anyone have this requirement for migrations? I have tested with the mysql select into file clause. Seems to work for simple data types - we're now testing with blobs...
Markus
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