腾讯云TDSQL-数据库字符集

--显示数据库支持的字符集

show char set;

1.针对每一种声明支持的字符集（支持的字符集应当包含utf8），创建一张表，并测试：

--根据show char set 执行的结果 选如下字符集创建表

CREATE TABLE test ( id int auto_increment primary key， name binary(16), gbk varchar(2) CHARACTER SET gbk DEFAULT NULL, utf8 varchar(2) CHARACTER SET utf8 DEFAULT NULL, latin_utf8 varchar(6) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1; a)测试增删改查操作；

insert into test (name,gbk,utf8,latin_utf8) values ('liudehua','ab','cd','df'); insert into test (name,gbk,utf8,latin_utf8) values ('liudehua','ab','cd','df'); insert into test (name,gbk,utf8,latin_utf8) values ('zhangxueyou','ef','c1','ji'); ​ ​ delete from test where latin_utf8='ji'; select * from test; +----+------------------+------+------+------------+ | id | name | gbk | utf8 | latin_utf8 | +----+------------------+------+------+------------+ | 1 | liudehua | ab | cd | df | | 2 | liudehua | ab | cd | df | +----+------------------+------+------+------------+ ​ update test set utf8='中国' where id = 2 and utf8='cd'; select * from test; +----+------------------+------+--------+------------+ | id | name | gbk | utf8 | latin_utf8 | +----+------------------+------+--------+------------+ | 1 | liudehua | ab | cd | df | | 2 | liudehua | ab | 中国 | df | +----+------------------+------+--------+------------+ b)对于支持utf8、gbk等含中文的情况，测试汉字“中国”增删改查操作；

insert into test (name,gbk,utf8,latin_utf8) values ('中国','中国','中国',_latin1'中国'); insert into test (name,gbk,utf8,latin_utf8) values ('中国','中国','中国',_latin1'中国'); delete from test where utf8='中国' and id =4; update test set utf8='日本',gbk='日本' where gbk='中国' and utf8='中国'; select * from test; +----+------------------+--------+--------+---------------+ | id | name | gbk | utf8 | latin_utf8 | +----+------------------+--------+--------+---------------+ | 1 | liudehua | 日本 | 日本 | df | | 5 | 中国 | 日本 | 日本 | 中国 | +----+------------------+--------+--------+---------------+ c)对于支持查询二进制值的情况，测试查询汉字“中国”的编码值，确定以正确的字符集存储；

select hex(name),hex(gbk),hex(utf8),hex(latin_utf8) from test; +----------------------------------+----------+--------------+-----------------+ | hex(name) | hex(gbk) | hex(utf8) | hex(latin_utf8) | +----------------------------------+----------+--------------+-----------------+ | 6C697564656875610000000000000000 | C8D5B1BE | E697A5E69CAC | 6466 | | E4B8ADE59BBD00000000000000000000 | C8D5B1BE | E697A5E69CAC | E4B8ADE59BBD | | E4B8ADE59BBD00000000000000000000 | D6D0B9FA | E4B8ADE59BBD | E4B8ADE59BBD | +----------------------------------+----------+--------------+-----------------+ 2.针对声明支持两种或更多字符集的情况，测试：

a)如果声明支持存储字符集转换，在支持的范围内测试存储字符集转换；

set names latin1; show variables like 'character_set%'; +--------------------------+---------+ | Variable_name | Value | +--------------------------+---------+ | character_set_client | latin1 | | character_set_connection | latin1 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | latin1 | | character_set_server | utf8mb4 | | character_set_system | utf8 | +--------------------------+---------+ select * from test; +----+------------------+------+------+------------+ | id | name | gbk | utf8 | latin_utf8 | +----+------------------+------+------+------------+ | 1 | liudehua | ?? | ?? | df | | 5 | 中国 | ?? | ?? | 中国 | | 6 | 中国 | ?? | ?? | 中国 | +----+------------------+------+------+------------+ b)如果声明支持连接字符集和存储字符集不一致，测试连接字符集与存储字符集不相同时，数据增、删、改、查操作是否合理处理，连接字符集与存储字符集都支持的汉字在增、删、改、查时是否正确转换；

MySQL [test]> set session character_set_connection=latin1; ​ MySQL [test]> select * From test; +----+------------------+--------+--------+---------------+ | id | name | gbk | utf8 | latin_utf8 | +----+------------------+--------+--------+---------------+ | 1 | liudehua | 日本 | 日本 | df | | 5 | 中国 | ?? | 日本 | 中国 | | 6 | 中国 | 中国 | 中国 | 中国 | +----+------------------+--------+--------+---------------+ ​ update test set gbk='美国' WHERE id=6; ​ MySQL [test]> select * from test; +----+------------------+--------+--------+---------------+ | id | name | gbk | utf8 | latin_utf8 | +----+------------------+--------+--------+---------------+ | 1 | liudehua | 日本 | 日本 | df | | 5 | 中国 | ?? | 日本 | 中国 | | 6 | 中国 | ?? | 中国 | 中国 | +----+------------------+--------+--------+---------------+ 3.如果声明支持二进制字符串，测试插入和查询出的二进制字符串的二进制数值是否完全一致。

insert into test (name,gbk,utf8,latin_utf8) values (UNHEX('4D7953514C'),'中国','中国',_latin1'中国'); select * from test; ​ +----+------------------+--------+--------+---------------+ | id | name | gbk | utf8 | latin_utf8 | +----+------------------+--------+--------+---------------+ | 1 | liudehua | 日本 | 日本 | df | | 5 | 中国 | ?? | 日本 | 中国 | | 6 | 中国 | ?? | 中国 | 中国 | | 7 | MySQL | 中国 | 中国 | 中国 | +----+------------------+--------+--------+---------------+ select hex(name) from test where id = 7; +----------------------------------+ | hex(name) | +----------------------------------+ | 4D7953514C0000000000000000000000 | +----------------------------------+