UUID
1. UUID 函数
UUID()
返回一个 UUID 字符串:
SELECT UUID();
UUID_SHORT()
返回一个 short
(2 字节)整数 UUID:
SELECT UUID_SHORT();
2. MySQL 8.0 新特性
MySQL 8.0 支持新的函数:
UUID_TO_BIN()
BIN_TO_UUID()
IS_UUID()
将 UUID 转换为二进制数据:
SELECT UUID_TO_BIN(UUID());
例如 m_user
表的主键是二进制的 UUID,查询二进制存储的 UUID:
SELECT BIN_TO_UUID(id) AS ID, `username` FROM `m_user`;
检测字符串是否满足 UUID:
SELECT IS_UUID('{12345678-1234-5678-1234-567812345678}') AS A,
IS_UUID('12345678123456781234567812345678') AS B,
IS_UUID('12345678-1234-5678-1234-567812345678') AS C;
结果:
+------+------+------+
| A | B | C |
+------+------+------+
| 1 | 1 | 1 |
+------+------+------+