From: Barry Lind <barry@xythos.com>
To: pgsql-interfaces@postgresql.org
Cc: pgsql-patches@postgresql.org
Subject: patch for character set encoding detection for JDBC
Date: Thu, 21 Dec 2000 18:45:48 -0800
Message-ID: <3A42C05C.8BC5858D@xythos.com> (raw)
In looking at the 7.1beta1 code for JDBC, I noticed that support was
added to support character set encodings. However I noticed that the
encoding that is used isn't obtained from the DB. Since Java uses
unicode UCS2 internally the character set encoding is used to translate
strings from/to the DB encoding. So it seems logical that the code
would get the encoding from the DB instead of the current method of
requiring the user pass it as a parameter.
Attached is a patch that gets the DB encoding from the DB in the same
manner as is done in libpq/fe-connect.c. The patch is created off of
the latest CVS sources (Connection.java version 1.10).
thanks,
--Barry
Attachments:patch.diff (text/plain, 3.9K) download
*** ./Connection.java.orig Thu Dec 21 18:20:36 2000
--- ./Connection.java Thu Dec 21 18:21:49 2000
***************
*** 125,132 ****
PG_HOST = host;
PG_STATUS = CONNECTION_BAD;
- encoding = info.getProperty("charSet"); // could be null-
// Now make the initial connection
try
{
--- 125,130 ----
***************
*** 265,274 ****
// This may cause some clients to break when they assume anything other than ISO,
// but then - they should be using the proper methods ;-)
//
//
firstWarning = null;
! ExecSQL("set datestyle to 'ISO'");
// Initialise object handling
initObjectTypes();
--- 263,346 ----
// This may cause some clients to break when they assume anything other than ISO,
// but then - they should be using the proper methods ;-)
//
+ // We also ask the DB for certain properties (i.e. DatabaseEncoding at this time)
//
firstWarning = null;
! java.sql.ResultSet initrset = ExecSQL("set datestyle to 'ISO'; select getdatabaseencoding()");
!
! String dbEncoding = null;
! //retrieve DB properties
! if(initrset.next()) {
!
! //handle DatabaseEncoding
! dbEncoding = initrset.getString(1);
! //convert from the PostgreSQL name to the Java name
! if (dbEncoding.equals("SQL_ASCII")) {
! dbEncoding = "ASCII";
! } else if (dbEncoding.equals("UNICODE")) {
! dbEncoding = "UTF8";
! } else if (dbEncoding.equals("LATIN1")) {
! dbEncoding = "ISO8859_1";
! } else if (dbEncoding.equals("LATIN2")) {
! dbEncoding = "ISO8859_2";
! } else if (dbEncoding.equals("LATIN3")) {
! dbEncoding = "ISO8859_3";
! } else if (dbEncoding.equals("LATIN4")) {
! dbEncoding = "ISO8859_4";
! } else if (dbEncoding.equals("LATIN5")) {
! dbEncoding = "ISO8859_5";
! } else if (dbEncoding.equals("LATIN6")) {
! dbEncoding = "ISO8859_6";
! } else if (dbEncoding.equals("LATIN7")) {
! dbEncoding = "ISO8859_7";
! } else if (dbEncoding.equals("LATIN8")) {
! dbEncoding = "ISO8859_8";
! } else if (dbEncoding.equals("LATIN9")) {
! dbEncoding = "ISO8859_9";
! } else if (dbEncoding.equals("EUC_JP")) {
! dbEncoding = "EUC_JP";
! } else if (dbEncoding.equals("EUC_CN")) {
! dbEncoding = "EUC_CN";
! } else if (dbEncoding.equals("EUC_KR")) {
! dbEncoding = "EUC_KR";
! } else if (dbEncoding.equals("EUC_TW")) {
! dbEncoding = "EUC_TW";
! } else if (dbEncoding.equals("KOI8")) {
! dbEncoding = "KOI8_R";
! } else if (dbEncoding.equals("WIN")) {
! dbEncoding = "Cp1252";
! } else {
! dbEncoding = null;
! }
! }
!
!
! //Set the encoding for this connection
! //Since the encoding could be specified or obtained from the DB we use the
! //following order:
! // 1. passed as a property
! // 2. value from DB if supported by current JVM
! // 3. default for JVM (leave encoding null)
! String passedEncoding = info.getProperty("charSet"); // could be null
!
! if (passedEncoding != null) {
! encoding = passedEncoding;
! } else {
! if (dbEncoding != null) {
! //test DB encoding
! try {
! "TEST".getBytes(dbEncoding);
! //no error the encoding is supported by the current JVM
! encoding = dbEncoding;
! } catch (UnsupportedEncodingException uee) {
! //dbEncoding is not supported by the current JVM
! encoding = null;
! }
! } else {
! encoding = null;
! }
! }
// Initialise object handling
initObjectTypes();
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To: pgsql-interfaces@postgresql.org
Cc: barry@xythos.com, pgsql-patches@postgresql.org
Subject: Re: patch for character set encoding detection for JDBC
In-Reply-To: <3A42C05C.8BC5858D@xythos.com>
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