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MySQL: Use charset utf8mb4 to allow 4-byte characters

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In MySQL, the character set named utf8 uses a maximum of 3 bytes
per character and contains only BMP characters.
It does not support supplementary characters.
In version 5.5.3, a new UTF-8 character set called
utf8mb4 has been introduced, which supports 4-byte characters.

[ChangeLog][QtSql][QSqlDatabase] When connecting to a MySQL server
whose version is 5.5.3 or higher, the default connection charset
is now utf8mb4 instead of utf8 to allow 4-byte UTF-8 encodings.

Change-Id: I718bd23212afd67367b39d4ce7da2a99ae0f1cca
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Liang Qi <liang.qi@qt.io>
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
This commit is contained in:
Philip Seeger 2016-06-06 23:26:02 +02:00
parent 3c6a7a96ef
commit 3f1e8d85cc
1 changed files with 7 additions and 2 deletions
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9
src/plugins/sqldrivers/mysql/qsql_mysql.cpp
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@ -1414,8 +1414,13 @@ bool QMYSQLDriver::open(const QString& db,
}
#if (MYSQL_VERSION_ID >= 40113 && MYSQL_VERSION_ID < 50000) || MYSQL_VERSION_ID >= 50007
// force the communication to be utf8
mysql_set_character_set(d->mysql, "utf8");
if (mysql_get_client_version() >= 50503 && mysql_get_server_version(d->mysql) >= 50503) {
// force the communication to be utf8mb4 (only utf8mb4 supports 4-byte characters)
mysql_set_character_set(d->mysql, "utf8mb4");
} else {
// force the communication to be utf8
mysql_set_character_set(d->mysql, "utf8");
}
#endif
#ifndef QT_NO_TEXTCODEC
d->tc = codec(d->mysql);