Mysql学习(一)添加一个新的用户并用golang操做Mysql
Mysql添加一个新的用户并赋予权限
添加一个本身的用户到mysqlmysql
首先咱们须要先用root用户登陆mysql，可是刚安装完没有密码，咱们先跳过密码git
ailumiyana@ailumiyana:~/Git_Project/Go_Test$ sudo mysqld_safe --skip-grant-tables
2019-01-07T01:35:51.559420Z mysqld_safe Logging to syslog. 2019-01-07T01:35:51.563797Z mysqld_safe Logging to '/var/log/mysql/error.log'.
root登录github
ailumiyana@ailumiyana:~/Git_Project/Go_Test$ sudo mysql -u root
Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 Server version: 5.7.24-0ubuntu0.18.04.1 (Ubuntu) Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
切换数据库， use mysqlgolang
mysql> use mysql Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed
查看mysql下的表单.sql
mysql> show tables; +---------------------------+ | Tables_in_mysql | +---------------------------+ | columns_priv | | db | | engine_cost | | event | | func | | general_log | | gtid_executed | | help_category | | help_keyword | | help_relation | | help_topic | | innodb_index_stats | | innodb_table_stats | | ndb_binlog_index | | plugin | | proc | | procs_priv | | proxies_priv | | server_cost | | servers | | slave_master_info | | slave_relay_log_info | | slave_worker_info | | slow_log | | tables_priv | | time_zone | | time_zone_leap_second | | time_zone_name | | time_zone_transition | | time_zone_transition_type | | user | | user_info | +---------------------------+ 32 rows in set (0.00 sec)
查看user表数据库
mysql> desc user;
+------------------------+-----------------------------------+------+-----+-----------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------------------+-----------------------------------+------+-----+-----------------------+-------+
| Host | char(60) | NO | PRI | | |
| User | char(32) | NO | PRI | | |
| Select_priv | enum('N','Y') | NO | | N | |
| Insert_priv | enum('N','Y') | NO | | N | |
| Update_priv | enum('N','Y') | NO | | N | |
| Delete_priv | enum('N','Y') | NO | | N | |
| Create_priv | enum('N','Y') | NO | | N | |
| Drop_priv | enum('N','Y') | NO | | N | |
| Reload_priv | enum('N','Y') | NO | | N | |
| Shutdown_priv | enum('N','Y') | NO | | N | |
| Process_priv | enum('N','Y') | NO | | N | |
| File_priv | enum('N','Y') | NO | | N | |
| Grant_priv | enum('N','Y') | NO | | N | |
| References_priv | enum('N','Y') | NO | | N | |
| Index_priv | enum('N','Y') | NO | | N | |
| Alter_priv | enum('N','Y') | NO | | N | |
| Show_db_priv | enum('N','Y') | NO | | N | |
| Super_priv | enum('N','Y') | NO | | N | |
| Create_tmp_table_priv | enum('N','Y') | NO | | N | |
| Lock_tables_priv | enum('N','Y') | NO | | N | |
| Execute_priv | enum('N','Y') | NO | | N | |
| Repl_slave_priv | enum('N','Y') | NO | | N | |
| Repl_client_priv | enum('N','Y') | NO | | N | |
| Create_view_priv | enum('N','Y') | NO | | N | |
| Show_view_priv | enum('N','Y') | NO | | N | |
| Create_routine_priv | enum('N','Y') | NO | | N | |
| Alter_routine_priv | enum('N','Y') | NO | | N | |
| Create_user_priv | enum('N','Y') | NO | | N | |
| Event_priv | enum('N','Y') | NO | | N | |
| Trigger_priv | enum('N','Y') | NO | | N | |
| Create_tablespace_priv | enum('N','Y') | NO | | N | |
| ssl_type | enum('','ANY','X509','SPECIFIED') | NO | | | |
| ssl_cipher | blob | NO | | NULL | |
| x509_issuer | blob | NO | | NULL | |
| x509_subject | blob | NO | | NULL | |
| max_questions | int(11) unsigned | NO | | 0 | |
| max_updates | int(11) unsigned | NO | | 0 | |
| max_connections | int(11) unsigned | NO | | 0 | |
| max_user_connections | int(11) unsigned | NO | | 0 | |
| plugin | char(64) | NO | | mysql_native_password | |
| authentication_string | text | YES | | NULL | |
| password_expired | enum('N','Y') | NO | | N | |
| password_last_changed | timestamp | YES | | NULL | |
| password_lifetime | smallint(5) unsigned | YES | | NULL | |
| account_locked | enum('N','Y') | NO | | N | |
+------------------------+-----------------------------------+------+-----+-----------------------+-------+
45 rows in set (0.03 sec)
查看user中的已存在的用户和主机ubuntu
mysql> select Host, User from user; +-----------+------------------+ | Host | User | +-----------+------------------+ | localhost | debian-sys-maint | | localhost | mysql.session | | localhost | mysql.sys | | localhost | root | +-----------+------------------+ 4 rows in set (0.00 sec)
接着咱们新增一个本身的帐户使用bash
mysql> CREATE USER '填用户名'@'localhost' IDENTIFIED BY '填密码'; Query OK, 0 rows affected (0.04 sec)
再次查看user表session
mysql> select Host, User from user; +-----------+------------------+ | Host | User | +-----------+------------------+ | localhost | ailumiyana | | localhost | debian-sys-maint | | localhost | mysql.session | | localhost | mysql.sys | | localhost | root | +-----------+------------------+ 5 rows in set (0.00 sec)
给新建的用户添加权限，刷新权限后， 查看新增用户的权限是否已经加进去.tcp
mysql> grant insert,select,delete,update,create,drop on *.* to ailumiyana@"localhost" identified by 'qwedsa'; Query OK, 0 rows affected, 1 warning (0.01 sec) mysql> flush privileges; Query OK, 0 rows affected (0.01 sec) mysql> show grants for ailumiyana@localhost; +---------------------------------------------------------------------------------------+ | Grants for ailumiyana@localhost | +---------------------------------------------------------------------------------------+ | GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP ON *.* TO 'ailumiyana'@'localhost' | +---------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
固然咱们本身用，固然设置全部权限，更为便捷，那么能够改为这样子
all privileges 表示全部权限.
mysql> grant all privileges on *.* to ailumiyana@"localhost" identified by 'qwedsa'; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.01 sec) mysql> show grants for ailumiyana@localhost; +---------------------------------------------------------+ | Grants for ailumiyana@localhost | +---------------------------------------------------------+ | GRANT ALL PRIVILEGES ON *.* TO 'ailumiyana'@'localhost' | +---------------------------------------------------------+ 1 row in set (0.00 sec)
退出,重启服务.
mysql> exit Bye ailumiyana@ailumiyana:~/Git_Project/Go_Test$ service mysql restart ==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units === Authentication is required to restart 'mysql.service'. Authenticating as: ailumiyana,,, (ailumiyana) Password: ==== AUTHENTICATION COMPLETE ===
这样新用户就添加进去了，也配置了适当的权限，接下来用golang简单测试一下。
使用go-sql-driver驱动测试Mysql
先在mysql中建立一个表
mysql> create table user_info(
-> id int(4) not null primary key auto_increment,
-> name char(20) not null);
Query OK, 0 rows affected (0.29 sec)
插入两个数据到user_info表中，而后查询此表。
package main
import (
"github.com/astaxie/beego/logs"
"database/sql"
_ "github.com/go-sql-driver/mysql"
)
func main() {
logs.Debug("main()")
db, err := sql.Open("mysql", "ailumiyana:qwedsa@tcp(127.0.0.1:3306)/mysql")
if err != nil {
logs.Error("sql Open() err", err)
}
stmt, err := db.Prepare("Insert user_info set id=?,name=?")
if err != nil {
logs.Error("sql Prepare() err", err)
}
stmt.Exec(1, "sola")
stmt.Exec(2, "ailumiyana")
rows, err :=db.Query("SELECT * FROM user_info")
if err != nil {
logs.Error("sql Query() err", err)
}
for rows.Next() {
var uid int
var username string
err = rows.Scan(&uid, &username)
if err != nil {
logs.Error("sql rows.Scan() err", err)
}
logs.Debug(uid, username)
}
}
其中sql.Open中的 第二个从参数是DSN格式数据 :
DSN(数据源名称)
数据源名称有一种常见的格式，例如PEAR DB使用的它，可是没有类型前缀(可选部分用方括号标记):
DSN的完整形式:
另外此例用了beego 的日志模块，和go-sql-driver驱动，使用前须要先用go get 下载。
go get能够根据要求和实际状况从互联网上下载或更新指定的代码包及其依赖包，并对它们进行编译和安装。在上面这个示例中，咱们从著名的代码托管站点Github上下载了一个项目（或称代码包），并安装到了环境变量GOPATH中包含的第一个工做区中。
结果
ailumiyana@ailumiyana:~/Git_Project/Go_Test$ go run mysql.go 2019/01/07 14:38:08.438 [D] main() 2019/01/07 14:38:08.443 [D] 1 sola 2019/01/07 14:38:08.443 [D] 2 ailumiyana
mysql> select * from user_info
-> ;
+----+-------------+
| id | name |
+----+-------------+
| 1 | sola |
| 2 | ailumiyana |
+----+-------------+
2 rows in set (0.02 sec)
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