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10.9.2 The utf8mb3 Character Set (3-Byte UTF-8 Unicode Encoding)
The utf8mb3
character set has these
characteristics:
Supports BMP characters only (no support for supplementary characters)
Requires a maximum of three bytes per multibyte character.
Applications that use UTF-8 data but require supplementary
character support should use utf8mb4
rather
than utf8mb3
(see
Section 10.9.1, “The utf8mb4 Character Set (4-Byte UTF-8 Unicode Encoding)”).
Exactly the same set of characters is available in
utf8mb3
and ucs2
. That is,
they have the same
repertoire.
utf8
is an alias for
utf8mb3
; the character limit is implicit,
rather than explicit in the name.
The utf8mb3
character set is deprecated and
will be removed in a future MySQL release. Please use
utf8mb4
instead. Although
utf8
is currently an alias for
utf8mb3
, at some point
utf8
will become a reference to
utf8mb4
. To avoid ambiguity about the
meaning of utf8
, consider specifying
utf8mb4
explicitly for character set
references instead of utf8
.
utf8mb3
can be used in CHARACTER
SET
clauses, and
utf8mb3_
in collation_substring
COLLATE
clauses, where
collation_substring
is
bin
, czech_ci
,
danish_ci
, esperanto_ci
,
estonian_ci
, and so forth. For example:
MySQL immediately converts instances of
utf8mb3
in statements to
utf8
, so in statements such as SHOW
CREATE TABLE
or SELECT CHARACTER_SET_NAME
FROM INFORMATION_SCHEMA.COLUMNS
or SELECT
COLLATION_NAME FROM INFORMATION_SCHEMA.COLUMNS
, users
will see the name utf8
or
utf8_
.
collation_substring
utf8mb3
is also valid in contexts other than
CHARACTER SET
clauses. For example:
mysqld --character-set-server=utf8mb3
For information about data type storage as it relates to multibyte character sets, see String Type Storage Requirements.
Document created the 26/06/2006, last modified the 26/10/2018
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