convert between utf8 and we8mswin1252 does not work properly
HelloWhen debugging an application, I wonder about the conversion SQL function. Then do some tests with accents.
* 1. Test with u * (UTF8 = 0xc3bc = 50108, Win-1252 = 0xFC = 252):
Select ascii (convert (chr (50108), 'WE8MSWIN1252', 'UTF8')) double;
Result = 252
== > Everything is OK. That's what I proposed.
* 2. Test with a * (UTF8 = 0xc3a4 = 50084, Win-1252 = 0xE4 228 =):
Select ascii (convert (chr (50084), 'WE8MSWIN1252', 'UTF8')) double;
Result = 0
== > What is? I suggested 228?
I tested two server Oracle (lokal 10.2.0.2 with UTF8 and apex.oracle.com) with the same result.
Can someone explain this behavior?
Yes, I can. The problem is to try using ASCII() in a UTF8 database to get a binary code in a string to WE8MSWIN1252. You must understand that the CONVERT function is should not be used for normal operation in the database. The channels it produces are VARCHAR2 and VARCHAR2 should always be in the database character set. If the CONVERSION target character set is not the database character set, the returned string is generally not valid (even if it contains a reasonable sequence of bytes in a character set) and may not be used in other SQL functions. CONVERT is a feature inherited from Oracle6 and must be used for the tasks of repair special only.
It happens that ASCII('[0xFC]') returns the correct result because 0xFC is not a valid in UTF8 code and happens to be interpreted "as-is" of the current implementation of ASCII, while ASCII('[0xE4']') does not return anything because the database recognizes the 0xE4 as the first byte of a UTF-8 of 3 bytes code and returns 0 failing to have the two remaining bytes. That's generally what docs call 'undefined results.
The path is valid only for watching the result of the CONVERSION would be to use the DUMP function.
-Sergiusz
Tags: Database
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