国产大片免费观看资源,色偷偷尼玛图亚洲综合,无码精品日韩专区第1页网址

主頁 > 知識(shí)庫 > mysql語句查詢用戶權(quán)限過程詳解

mysql語句查詢用戶權(quán)限過程詳解

在MySQL中，如何查看一個(gè)用戶被授予了那些權(quán)限呢？授予用戶的權(quán)限可能分全局層級(jí)權(quán)限、數(shù)據(jù)庫層級(jí)權(quán)限、表層級(jí)別權(quán)限、列層級(jí)別權(quán)限、子程序?qū)蛹?jí)權(quán)限。具體分類如下：

全局層級(jí)

全局權(quán)限適用于一個(gè)給定服務(wù)器中的所有數(shù)據(jù)庫。這些權(quán)限存儲(chǔ)在mysql.user表中。GRANT ALL ON *.*和REVOKE ALL ON *.*只授予和撤銷全局權(quán)限。

數(shù)據(jù)庫層級(jí)

數(shù)據(jù)庫權(quán)限適用于一個(gè)給定數(shù)據(jù)庫中的所有目標(biāo)。這些權(quán)限存儲(chǔ)在mysql.db和mysql.host表中。GRANT ALL ON db_name.*和REVOKE ALL ON db_name.*只授予和撤銷數(shù)據(jù)庫權(quán)限。

表層級(jí)

表權(quán)限適用于一個(gè)給定表中的所有列。這些權(quán)限存儲(chǔ)在mysql.tables_priv表中。GRANT ALL ON db_name.tbl_name和REVOKE ALL ON db_name.tbl_name只授予和撤銷表權(quán)限。

列層級(jí)

列權(quán)限適用于一個(gè)給定表中的單一列。這些權(quán)限存儲(chǔ)在mysql.columns_priv表中。當(dāng)使用REVOKE時(shí)，您必須指定與被授權(quán)列相同的列。

子程序?qū)蛹?jí)

CREATE ROUTINE, ALTER ROUTINE, EXECUTE和GRANT權(quán)限適用于已存儲(chǔ)的子程序。這些權(quán)限可以被授予為全局層級(jí)和數(shù)據(jù)庫層級(jí)。而且，除了CREATE ROUTINE外，這些權(quán)限可以被授予為子程序?qū)蛹?jí)，并存儲(chǔ)在mysql.procs_priv表中。

1：那么我們來創(chuàng)建一個(gè)測(cè)試賬號(hào)test，授予全局層級(jí)的權(quán)限。如下所示：

mysql> grant select,insert on *.* to test@'%' identified by 'test';
Query OK, 0 rows affected (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql>

那么可以用下面兩種方式查詢授予test的權(quán)限。如下所示：

mysql> show grants for test;
+--------------------------------------------------------------------------------------------------------------+
| Grants for test@% |
+--------------------------------------------------------------------------------------------------------------+
| GRANT SELECT, INSERT ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
+--------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> select * from mysql.user where user='test'\G;
*************************** 1. row ***************************
Host: %
User: test
Password: *94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29
Select_priv: Y
Insert_priv: Y
Update_priv: N
Delete_priv: N
Create_priv: N
Drop_priv: N
Reload_priv: N
Shutdown_priv: N
Process_priv: N
File_priv: N
Grant_priv: N
References_priv: N
Index_priv: N
Alter_priv: N
Show_db_priv: N
Super_priv: N
Create_tmp_table_priv: N
Lock_tables_priv: N
Execute_priv: N
Repl_slave_priv: N
Repl_client_priv: N
Create_view_priv: N
Show_view_priv: N
Create_routine_priv: N
Alter_routine_priv: N
Create_user_priv: N
Event_priv: N
Trigger_priv: N
Create_tablespace_priv: N
ssl_type: 
ssl_cipher: 
x509_issuer: 
x509_subject: 
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
plugin: mysql_native_password
authentication_string: 
password_expired: N
1 row in set (0.04 sec)
ERROR: 
No query specified
mysql>

2：那么我們來創(chuàng)建一個(gè)測(cè)試賬號(hào)test，授予數(shù)據(jù)庫層級(jí)的權(quán)限。如下所示：

mysql> drop user test;
Query OK, 0 rows affected (0.00 sec)
mysql> grant select,insert,update,delete on MyDB.* to test@'%' identified by 'test';
Query OK, 0 rows affected (0.01 sec)
mysql> 
mysql> select * from mysql.user where user='test'\G; --可以看到無任何授權(quán)。
mysql> select * from mysql.db where user='test'\G;
*************************** 1. row ***************************
Host: %
Db: MyDB
User: test
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: N
Drop_priv: N
Grant_priv: N
References_priv: N
Index_priv: N
Alter_priv: N
Create_tmp_table_priv: N
Lock_tables_priv: N
Create_view_priv: N
Show_view_priv: N
Create_routine_priv: N
Alter_routine_priv: N
Execute_priv: N
Event_priv: N
Trigger_priv: N
1 row in set (0.04 sec)
ERROR: 
No query specified
mysql> 
mysql> show grants for test;
+-----------------------------------------------------------------------------------------------------+
| Grants for test@% |
+-----------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
| GRANT SELECT, INSERT, UPDATE, DELETE ON `MyDB`.* TO 'test'@'%' |
+-----------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql>

3：那么我們來創(chuàng)建一個(gè)測(cè)試賬號(hào)test，授予表層級(jí)的權(quán)限。如下所示：

mysql> drop user test;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> grant all on MyDB.kkk to test@'%' identified by 'test';
Query OK, 0 rows affected (0.01 sec)
mysql> 
mysql> show grants for test;
+-----------------------------------------------------------------------------------------------------+
| Grants for test@% |
+-----------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
| GRANT ALL PRIVILEGES ON `MyDB`.`kkk` TO 'test'@'%' |
+-----------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> select * from mysql.tables_priv\G;
*************************** 1. row ***************************
Host: %
Db: MyDB
User: test
Table_name: kkk
Grantor: root@localhost
Timestamp: 0000-00-00 00:00:00
Table_priv: Select,Insert,Update,Delete,Create,Drop,References,Index,Alter,Create View,Show view,Trigger
Column_priv: 
1 row in set (0.01 sec)
ERROR: 
No query specified
mysql>

4：那么我們來創(chuàng)建一個(gè)測(cè)試賬號(hào)test，授予列層級(jí)的權(quán)限。如下所示：

mysql> drop user test;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> grant select (id, col1) on MyDB.TEST1 to test@'%' identified by 'test';
Query OK, 0 rows affected (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> 
mysql> select * from mysql.columns_priv;
+------+------+------+------------+-------------+---------------------+-------------+
| Host | Db | User | Table_name | Column_name | Timestamp | Column_priv |
+------+------+------+------------+-------------+---------------------+-------------+
| % | MyDB | test | TEST1 | id | 0000-00-00 00:00:00 | Select |
| % | MyDB | test | TEST1 | col1 | 0000-00-00 00:00:00 | Select |
+------+------+------+------------+-------------+---------------------+-------------+
2 rows in set (0.00 sec)
mysql> show grants for test;
+-----------------------------------------------------------------------------------------------------+
| Grants for test@% |
+-----------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
| GRANT SELECT (id, col1) ON `MyDB`.`TEST1` TO 'test'@'%' |
+-----------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql>

5：那么我們來創(chuàng)建一個(gè)測(cè)試賬號(hào)test，授子程序?qū)蛹?jí)的權(quán)限。如下所示：

mysql> DROP PROCEDURE IF EXISTS PRC_TEST;
Query OK, 0 rows affected (0.00 sec)
mysql> DELIMITER //
mysql> CREATE PROCEDURE PRC_TEST()
-> BEGIN
-> SELECT * FROM kkk;
-> END //
Query OK, 0 rows affected (0.00 sec)
mysql> DELIMITER ;
mysql> grant execute on procedure MyDB.PRC_TEST to test@'%' identified by 'test';
Query OK, 0 rows affected (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> 
mysql> show grants for test;
+-----------------------------------------------------------------------------------------------------+
| Grants for test@% |
+-----------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
| GRANT EXECUTE ON PROCEDURE `MyDB`.`prc_test` TO 'test'@'%' |
+-----------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> select * from mysql.procs_priv where User='test';
+------+------+------+--------------+--------------+----------------+-----------+---------------------+
| Host | Db | User | Routine_name | Routine_type | Grantor | Proc_priv | Timestamp |
+------+------+------+--------------+--------------+----------------+-----------+---------------------+
| % | MyDB | test | PRC_TEST | PROCEDURE | root@localhost | Execute | 0000-00-00 00:00:00 |
+------+------+------+--------------+--------------+----------------+-----------+---------------------+
1 row in set (0.00 sec)
mysql>

所以，如果需要查看用戶被授予的權(quán)限，就需要從這五個(gè)層級(jí)來查看被授予的權(quán)限。從上到下或從小到上，逐一檢查各個(gè)層級(jí)被授予的權(quán)限。

以上就是本文的全部內(nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

您可能感興趣的文章:

MySQL查詢重寫插件的使用
一篇文章弄懂MySQL查詢語句的執(zhí)行過程
Python使用sql語句對(duì)mysql數(shù)據(jù)庫多條件模糊查詢的思路詳解
MySQL 數(shù)據(jù)庫 like 語句通配符模糊查詢小結(jié)
淺談pymysql查詢語句中帶有in時(shí)傳遞參數(shù)的問題
MySQL模糊查詢語句整理集合
MySQL常用SQL語句總結(jié)包含復(fù)雜SQL查詢
SQL語句執(zhí)行深入講解（MySQL架構(gòu)總覽->查詢執(zhí)行流程->SQL解析順序）
MySQL 重寫查詢語句的三種策略

標(biāo)簽：烏海湖北聊城白銀湖南臨汾云浮武威

巨人網(wǎng)絡(luò)通訊聲明：本文標(biāo)題《mysql語句查詢用戶權(quán)限過程詳解》，本文關(guān)鍵詞 mysql,語句,查詢,用戶,權(quán)限,；如發(fā)現(xiàn)本文內(nèi)容存在版權(quán)問題，煩請(qǐng)?zhí)峁┫嚓P(guān)信息告之我們，我們將及時(shí)溝通與處理。本站內(nèi)容系統(tǒng)采集于網(wǎng)絡(luò)，涉及言論、版權(quán)與本站無關(guān)。