树叶云OceanBase教程：OceanBase CREATE SYNONYM

描述

该语句用来创建一个同义词。

格式

CREATE [ OR REPLACE ] [ PUBLIC ]
SYNONYM [ schema. ]synonym
FOR [ schema. ]object;

参数说明

示例

• 创建一个同义词。

OceanBase(TEST@TEST)>create table t1(c1 int);
Query OK, 0 rows affected (0.11 sec)

OceanBase(TEST@TEST)>create synonym s1 for t1;
Query OK, 0 rows affected (0.04 sec)

OceanBase(TEST@TEST)>insert into s1 values(1);
Query OK, 1 row affected (0.04 sec)

OceanBase(TEST@TEST)>select * from s1;
+------+
| C1   |
+------+
|    1 |
+------+
1 row in set (0.02 sec)

• 创建一个 PUBLIC 同义词

OceanBase(TEST@TEST)>create public synonym syn_pub for t1;
Query OK, 0 rows affected (0.04 sec)

OceanBase(TEST@TEST)>select * from syn_pub;
+------+
| C1   |
+------+
|    1 |
+------+
1 row in set (0.01 sec)

注意事项

创建同义词时，需要满足如下权限要求：

• 在当前的 schema 下创建私有的 synonym，需要 CREATE SYNONYM 权限

• 在非当前 schema 下创建私有的 synonym，需要 CREATE ANY SYNONYM 权限

• 创建 PUBLIC 的 synonym，需要 CREATE PUBLIC SYNONYM 权限

• 对于需要创建 synonym 的对象不需要存在，也不需要具有访问权限

// 创建synonym_user
OceanBase(TEST@TEST)>CREATE USER synonym_user IDENTIFIED BY synonym_user;
Query OK, 0 rows affected (0.04 sec)

OceanBase(TEST@TEST)>grant CREATE on test.* to synonym_user;
Query OK, 0 rows affected (0.05 sec)

OceanBase(TEST@TEST)>grant SELECT on test.* to synonym_user;
Query OK, 0 rows affected (0.02 sec)

// 连接synonym_user
OceanBase(SYNONYM_USER@TEST)>create or replace synonym s1 for t1;
ERROR-00600: internal error code, arguments: -5036, Access denied; you need (at least one of) the CREATE SYNONYM privilege(s) for this operation

// 重新给定CREATE SYNONYM权限
OceanBase(TEST@TEST)>grant CREATE SYNONYM on *.* to synonym_user;
Query OK, 0 rows affected (0.03 sec)

OceanBase(SYNONYM_USER@TEST)>create synonym s1 for t1;
Query OK, 0 rows affected (0.07 sec)