Jorge Godoy schrieb: > Jon Rosebaugh wrote: > >> What are we supposed to do with Unicode? As far as I can tell, the >> Unicode type passes its defined length directly to the underlying >> string, so that a Unicode(30) column is turned into a VARCHAR(30) or >> the dialect equivalent. I may be able to determine that a particular >> column should hold up to 30 Unicode characters, for example, but if >> the default encoding of UTF-8 is used, each character will use >> anywhere from one to four byes, so that in the extreme case, it will >> be trying to stuff a 120-byte string into a VARCHAR(30)! The only way >> to be certain of the length is to use UTF-32, although in practice I >> doubt I will ever get astral plane characters in this app, so UTF-16 >> would probably be sufficient. But I _like_ UTF-8 and would prefer to >> use it. Perhaps the Unicode type should multiply its length by 4? > > What RDBMS you use? And what is the encoding of the specific database where > you tested this? If you have a database with UTF-8 encoding then it will > be expecting 30 Unicode characters coded with the UTF-8 encoding, no matter > how many bytes it takes to store then. > > A VARCHAR(30) is not referring to 30 bytes, but to 30 characters. Unless he is using Oracle with NLS_LENGTH_SEMANTICS as Bytes..., then its really Bytes..., but thats a bad setting for various reasons.
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