2、设置用户、密码让指定的IP访问:mysql -u root -p 或安装的快捷方式进入:MySQL Command Line Client,使用grant命令: grant 权限1,权限2,权限n on 数据库名称.表名称 to 用户名@用户地址 identified by '连接口令'; 例子: mysqlgrant select,insert,upda
2、设置用户、密码让指定的IP访问:mysql -u root -p 或安装的快捷方式进入:MySQL Command Line Client,使用grant命令:
grant 权限1,权限2,…权限n on 数据库名称.表名称 to 用户名@用户地址 identified by '连接口令';
例子:
mysql>grant select,insert,update,delete,create,drop on mydb.mytable to lzpddd@192.168.1.88 identified by 'mypassword';
给来自192.168.1.88的用户lzpddd分配可对数据库 mydb的mytable表进行select,insert,update,delete,create,drop等操作的权限,并设定口令为'mypassword';
mysql>grant all privileges on *.* to lzpddd@192.168.1.88 identified by 'mypassword';
给来自192.168.1.88的用户lzpddd分配可对所有数据库的所有表进行所有操作的权限限,并设定口令为'mypassword';
mysql>grant all privileges on *.* to lzpddd@'%' identified by 'mypassword';
给来自任何IP地址的用户lzpddd分配可对所有数据库的所有表进行所有操作的权限限,并设定口令为'mypassword';
3、关闭服务器端防火墙或者开放3306端口(很重要);
4、客户端连接:
进入命令行,windows cmd,连接:
mysql -u 用户名 -p密码 -h 服务器IP地址 -P 服务器端MySQL端口号 -D 数据库名
注意:
(1)服务器端口标志-P一定要大些以区别于用户-p,如果直接连接数据库标志-D也要大写;
(2)如果要直接输入密码-p后面不能留有空格如-pmypassword;
(3)命令结束段没有';'分号。
例子:
mysql -u lzpddd -pmypassword -h 192.168.1.88 -P 3306 -D mydb
1.在web服务器A配置好web服务。假设web服务器的IP为:192.192.192.192
2.在数据库服务器B安装好mysql服务。
3.现在新版的mysql一般默认都不允许远程连接的。需要建立远程连接账号才可以。
以命令行方式使用root账号进入mysql。
mysql -uroot -ppass
选择进入mysql数据库
use `mysql`;
查看所有存在的账号和地址。
SELECT `Host`,`User` FROM `user`;
比如我的就是:
+-----------+------+
| Host | User |
+-----------+------+
| localhost | |
| localhost | pma |
| localhost | root |
+-----------+------+
3 rows in set (0.00 sec)
也就是说,存在三个只允许本地连接的(localhost)账号,分别为 root、pma、空用户。
现在决定让root具有上面那个web服务器A的远程链接的权限,那么就这样。
UPDATE `user` SET `Host`='192.192.192.192' WHERE `User`='root' LIMIT 1;
这样192.192.192.192这台web服务器就可以远程连接到这个数据库服务器了。假如你想让任何远程机器都可以连接这个数据库,就将192.192.192.192换为%。不过不建议这样做!

MySQL functions can be used for data processing and calculation. 1. Basic usage includes string processing, date calculation and mathematical operations. 2. Advanced usage involves combining multiple functions to implement complex operations. 3. Performance optimization requires avoiding the use of functions in the WHERE clause and using GROUPBY and temporary tables.

Efficient methods for batch inserting data in MySQL include: 1. Using INSERTINTO...VALUES syntax, 2. Using LOADDATAINFILE command, 3. Using transaction processing, 4. Adjust batch size, 5. Disable indexing, 6. Using INSERTIGNORE or INSERT...ONDUPLICATEKEYUPDATE, these methods can significantly improve database operation efficiency.

In MySQL, add fields using ALTERTABLEtable_nameADDCOLUMNnew_columnVARCHAR(255)AFTERexisting_column, delete fields using ALTERTABLEtable_nameDROPCOLUMNcolumn_to_drop. When adding fields, you need to specify a location to optimize query performance and data structure; before deleting fields, you need to confirm that the operation is irreversible; modifying table structure using online DDL, backup data, test environment, and low-load time periods is performance optimization and best practice.

Use the EXPLAIN command to analyze the execution plan of MySQL queries. 1. The EXPLAIN command displays the execution plan of the query to help find performance bottlenecks. 2. The execution plan includes fields such as id, select_type, table, type, possible_keys, key, key_len, ref, rows and Extra. 3. According to the execution plan, you can optimize queries by adding indexes, avoiding full table scans, optimizing JOIN operations, and using overlay indexes.

Subqueries can improve the efficiency of MySQL query. 1) Subquery simplifies complex query logic, such as filtering data and calculating aggregated values. 2) MySQL optimizer may convert subqueries to JOIN operations to improve performance. 3) Using EXISTS instead of IN can avoid multiple rows returning errors. 4) Optimization strategies include avoiding related subqueries, using EXISTS, index optimization, and avoiding subquery nesting.

Methods for configuring character sets and collations in MySQL include: 1. Setting the character sets and collations at the server level: SETNAMES'utf8'; SETCHARACTERSETutf8; SETCOLLATION_CONNECTION='utf8_general_ci'; 2. Create a database that uses specific character sets and collations: CREATEDATABASEexample_dbCHARACTERSETutf8COLLATEutf8_general_ci; 3. Specify character sets and collations when creating a table: CREATETABLEexample_table(idINT

To safely and thoroughly uninstall MySQL and clean all residual files, follow the following steps: 1. Stop MySQL service; 2. Uninstall MySQL packages; 3. Clean configuration files and data directories; 4. Verify that the uninstallation is thorough.

Renaming a database in MySQL requires indirect methods. The steps are as follows: 1. Create a new database; 2. Use mysqldump to export the old database; 3. Import the data into the new database; 4. Delete the old database.


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