如何查看 MySQL 数据库/表/列的字符集?
mysqlmysqli database
要检查 MySQL 数据库/表/列的字符集，让我们看一个例子:使用名为"business"的数据库，表名为"student"，该表已存在于数据库中。
检查表字符集的语法。
SELECT CCSA.character_set_name FROM information_schema.`TABLES` T,information_schema.`COLLATION_CHARACTER_SET_APPLICABILITY` CCSA WHERE CCSA.collation_name = T.table_collation AND T.table_schema = "yourDatabaseName" AND T.table_name = "yourTableName";
应用上述语法显示表 student 的字符集。
mysql> SELECT CCSA.character_set_name FROM information_schema.`TABLES` T, -> information_schema.`COLLATION_CHARACTER_SET_APPLICABILITY` CCSA -> WHERE CCSA.collation_name = T.table_collation -> AND T.table_schema = "business" -> AND T.table_name = "student";
以下是输出。
+--------------------+ | CHARACTER_SET_NAME | +--------------------+ | utf8mb4 | +--------------------+ 1 row in set (0.13 sec)
要查找数据库的字符集，语法如下。
SELECT default_character_set_name FROM information_schema.SCHEMATA WHERE schema_name = "yourDatabaseName";
应用上述语法来查看数据库的字符集。
mysql> SELECT default_character_set_name FROM information_schema.SCHEMATA -> WHERE schema_name = "business";
以下是输出。
+----------------------------+ | DEFAULT_CHARACTER_SET_NAME | +----------------------------+ | utf8mb4 | +----------------------------+ 1 row in set (0.00 sec)
查找列的字符集。
SELECT character_set_name FROM information_schema.`COLUMNS` WHERE table_schema = "yourDatabaseName" AND table_name = "yourTableName" AND column_name = "yourColumnName";
应用上述语法来查看"student"表和"business"数据库的列名'Name'的字符集。
mysql> SELECT character_set_name FROM information_schema.`COLUMNS` -> WHERE table_schema = "business" -> AND table_name = "student" -> AND column_name = "Name";
以下是输出。
+--------------------+ | CHARACTER_SET_NAME | +--------------------+ | utf8mb4 | +--------------------+ 1 row in set (0.00 sec)
