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一、创建数据库
语法：CREATE DATABASE [IF NOT EXISTS] <数据库名> [[DEFAULT] CHARACTER SET <字符集名>]
[[DEFAULT] COLLATE <校对规则名>];
注：1.[]中内容为可选内容
2.建表语句不区分大小写
IF NOT EXISTS：在创建数据库之前进行判断是否存在，只有在该数据库不存在时才能执行操作。这是用来避免数据库已存在重复创建的错误。
[DEFAULT] CHARACTER SET：指定数据库的默认字符集，一般为 utf8
[DEFAULT] COLLATE：指定字符集的默认校对规则，一般为 utf8_general_ci
实例：
CREATE DATABASE IF NOT EXISTS test_db DEFAULT CHARACTER SET utf8 DEFAULT
COLLATE utf8_general_ci;
执行后返回
Query OK, 1 row affected (0.00 sec)
表示数据库创建成功。
二、查询数据库
语法：SHOW DATABASES [LIKE ’ 数据库名中包含的字符串’]
实例：
SHOW DATABASES LIKE '%TEST%';
结果返回所有包含‘test’字符的数据库，如果不加[]中的like 及后面的，则返回所有数据库：
+----------------------+ | Database (%TEST%) | +----------------------+ |
platform_common_test| | test | | test_db | | test_db_char | | test_db_char_1 | |
test_db_char_2| +----------------------+ 6 rows in set (0.00 sec)
三、导入数据库（source）
·use 数据库名
source 完成目录
