Issue inserting UTF8 data into Oracle in windows environment.

I have a UTF8 PHP application that is writing a string containing special characters to oracle through a ODBC connection. The Oracle database is setup for UTF8 support.
Here is the issue. I have a simple string, "louis de funès". When the data manually moved correctly in UTF8 the data comes up correctly. The Oracle dump() shows:
WORKING DATA:
String: louis de funès
select keywords, dump(keywords, 17) from ame_links where keywords like '%louis de %';
Typ=1 Len=15: l,o,u,i,s, ,d,e, ,f,u,n,c3,a8,s
However, when the same string is Inserted through the PHP application the data shows up in the db like this.
NOT - WORKING:
String: louis de funès
select keywords, dump(keywords, 17) from ame_links where keywords like '%louis de %';
Typ=1 Len=17: l,o,u,i,s, ,d,e, ,f,u,n,c3,83,c2,a8,
(The è character has 4 bytes associated with it)
Windows Setup:
Windows Registry: HKEY_LOCAL_MACHINE -> SOFTWARE -> ORACLE -> HOME0 ->
NLS_LANG=AMERICAN_AMERICA.UTF8
HTTP headers are set for Content-Type:text/html; charset=UTF-8.
Anyone know why I would get 2 extra bytes (83,c2) added in the middle of the è character? Is the oracle client doing some other type of character set conversion before I insert it into the database.
I have also noticed that when I change the NLS_LANG from AMERICAN_AMERICA.UTF8 to AMERICAN_AMERICA.WE8MSWIN1252 that the 4 byte 'è' character works and the 2 byte character doesn't.

I reproduced the porblem. Only differnce from yours is that it reproduces regardless the NLS_LANG setting.
Although I cannot be 100% sure, I think what is happening is that Microsoft ODBC Driver Manager converts the insert statement from Windows ACP to Unicode, then calls SQLExecDirectW (WideChar version of SQLExecDirect) of the Oracle ODBC Driver and passes the insert statement in Unicode. Since your PHP code passed the insert statement in UTF-8 encoding, and the Driver Manager converted it from Windows ACP to Unicode, the letter e with grave ("c3,a8" in UTF-8) was wrongly converted to U+00c3, U+00a8 in the Unicode insert statement, then converted to UTF8 ( "c3,83,c2,a8") by Oracle.
By looking at the PHP source code, apparently PHP odbc_exec() function calls ANSI SQLExecDirect().
I tried to verify that the Driver Manager calls SQLExecDirectW() of Oracle ODBC Driver by enabling the ODBC Tracing, but I couldn't make it work. It genetates an emply SQL.LOG file. So my investigation stops here.
IF YOUR METADATA NAMES ARE ASCII ONLY, AND NON-ASCII CHARACTERS APPEAR ONLY IN DATA, you can workaround this problem by binding data. For example,
$stmt = odbc_prepare($conn, "insert into AME_LINKS (keywords, site_id) values (?, ?)");
$rs = odbc_execute($stmt, array($invar,77));
Makoto

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news:[email protected]...
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