Convert with the IFX_CODESETLOB environment variable

You can automate the following pair of code-set conversions for TEXT and CLOB data types:
  • Convert from client locale to database locale before the data is sent to the database server.
  • Convert from database locale to client locale before the data is retrieved by the client.
To automate code-set conversion for TEXT and CLOB data types, set the IFX_CODESETLOB environment variable in the connection URL. For example: IFX_CODESETLOB = 4096. You can also use the following methods of the IfxDataSource class to set and get the value of IFX_CODESETLOB: 
public void setIfxIFX_CODESETLOB(int codesetlobFlag);
public int getIfxIFX_CODESETLOB();
IFX_CODESETLOB can have the following values:
none
Default

Automatic code-set conversion is not enabled.

0
Automatic code-set conversion takes place in internal temporary files.
> 0
Automatic code-set conversion takes place in the memory of the client computer. The value indicates the number of bytes allocated for the conversion.

If the number of allocated bytes is less than the size of the large object, an error is returned.

To perform conversion in memory, you must specify an amount that is smaller than the memory limits of the client machines and larger than the possible size of any converted large object.

When you are using any of the following java.sql.Clob interface methods or HCL OneDB™ extensions to the Clob interface, no code-set conversion is performed, even if the IFX_CODESETLOB environment variable is set. These methods include: 
IfxCblob::setAsciiStream(long)
Clob::setAsciiStream(long position, InputStream fin, int length)

IFX_CODESETLOB takes effect only for methods from the java.sql.PreparedStatement interface.

However when using any of following java.sql.Clob interface methods or HCL OneDB extensions to Clob interface, Unicode characters are always converted automatically to the database locale code set. Here is a list of those methods: 
Clob::setCharacterStream(long) throws SQLException
Clob::setString(long, String) throws SQLException
Clob:: setString(long pos, String str, int offset, int len)
IfxCblob::setSubString(long position, String str, int length)