The purpose of these release notes is to make you aware of any special actions required to configure and use the IBM® Informix® JDBC Driver on your computer. This file also describes new features and feature differences from earlier versions of this product and other IBM Informix products and how these differences affect current products. This release notes document is not intended to be all-inclusive; it should be used as an addendum to the IBM Informix JDBC Driver Programmer's Guide, which provides thorough information about product features and behavior. These release notes are written for Java™ programmers who use the JDBC API to connect to IBM Informix databases via the IBM Informix JDBC Driver.
IBM Informix JDBC Driver 3.50 is supported with the following server versions:
You must have JRE 1.4.2 or later installed to use the IBM Informix JDBC Driver. Refer to http://java.sun.com/products/jdbc/ for details.
The IBM Informix JDBC driver is tested to run on these platforms:
The Informix JDBC Driver, Version 3.50.JC3, supports the following new feature.
Informix Dynamic Server (IDS) now supports using savepoints within the statements of an SQL transaction. See the IDS release notes for a description of this feature.
The following methods supplied by the JDBC 3.0 specification are now valid in this release:
The methods that return multiple result sets are now the only standard methods the JDBC 3.0 specification that are not currently supported by the IBM Informix JDBC driver.
In addition, the following new method of the IfxConnection class can define a savepoint whose identifier is unique in the current connection:
Two new classes have been added to JDBC to support savepoint objects:
Changes were made in the 3.50.JC1 version of Informix JDBC driver to allow you to use the following features of IDS, version 11.50. See the IDS release notes for that version to learn more about the new features:
The following new feature is available in the Informix JDBC Driver, 3.50.JC1.
You can now specify the service name of the Informix database server instead of the port number when configuring connections in the sqlhosts file or a connection URL.
Except for the pickaseat demo, the examples listed in the IBM Informix JDBC Driver Programmer's Guide, Version 3.50, use the DriverManager.getConnection() method to get a database connection. Sun Microsystems recommends using a DataSource object instead. For more information, refer to the Sun documentation and to the README.TXT file in the demo/pickaseat directory.
The following are required. Otherwise, the java.net library might throw a java.net.UnknownHostException when connecting to an IDS server using a host with an ipV6 address:
or
The following defects were corrected in version 3.50.JC6:
The following defects were corrected in version 3.50.JC5:
The following defects were corrected in version 3.50.JC4:
The following defect was corrected in version 3.50.JC3R1:
The following defect was corrected in version 3.50.JC3:
The following defects were corrected in version 3.50.JC2:
The following defects were corrected in version 3.50.JC1:
Sun JDK 1.4.2 does not support the codeset CP943.
Refer to the IBM Informix JDBC Driver Programmer's Guide for complete list of unsupported methods.
The Xerces XML library xerces.jar has been removed from distribution with the IBM Informix JDBC driver 3.10 and later. Xerces is an open source library that is freely available for download from the following location:
http://www.alphaworks.ibm.com/tech/xml4j
This section describes feature and performance topics not covered in the IBM Informix JDBC Driver Programmer's Guide or modified since publication.
The IFX_LOB_XFERSIZE environment variable is used to specify the number of bytes in a CLOB or BLOB to transfer from a client application to the database server before checking whether an error has occurred. The error check occurs each time the specified number of bytes is transferred. If an error occurs, the remaining data is not sent and an error is reported. If no error occurs, the file transfer will continue until it finishes.
For example, if the value of IFX_LOB_XFERSIZE is set to 10485760 (10 MB), then error checking will occur after every 10485760 bytes of the CLOB or BLOB is sent. If the IFX_LOB_XFERSIZE environment variable is not set, the error check occurs after the entire BLOB or CLOB is transferred.
The valid range for the IFX_LOB_XFERSIZE environment variable is from 1 to 9223372036854775808 bytes. The IFX_LOB_XFERSIZE environment variable is set on the client.
You should adjust the value of IFX_LOB_XFERSIZE to suit your environment. Set the IFX_LOB_XFERSIZE environment variable low enough so that transmission errors of large BLOB or CLOB data types are detected early, but not so low that excessive network resources are consumed.
To enable Unicode collation by Java/JDBC client applications using the International Components for Unicode (ICU), specify GL_USEGLU=1 in the connection string before connecting to a Dynamic Server instance. This enables the server to utilize advanced Unicode converters that are required to work with Java.
If your JDBC application hangs on your HP-UX server, check the setting for the PTHREAD_COMPAT_MODE environment variable on the HP-UX server. The PTHREAD_COMPAT_MODE environment variable should be set to 1. This variable tells the pthread library (libpthread) to run in 1 X 1 mode instead of MxN mode. 1 X 1 is the default mode now on HP-UX. Setting this environment variable should resolve the hang problem.
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