python从mysql数据库下载数据 python数据库怎么下载

1.首先下载mysql我选择的版本是5.7.19 基于64位的windows操作系统。mysql的下载地址传送门：https://dev.mysql.com/downloads/mysql/5.7.html#downloads 这里面有不同操作系统的安装包大家有需要都可以自行去下载。

具体安装如下：

1、把 mysql-5.7.20-winx64zip 压缩文件解压到 D:\application\mysql 目录下；

2、在 D:\application\mysql目录下新建 my.ini 配置文件；

3、用文本编辑器或其他编辑器打开 my.ini 文件，把以下代码复制粘贴进去，保存退出；

#代码开始

[Client]

#设置3306端口

port = 3306

[mysqld]

#设置3306端口

port = 3306

# 设置mysql的安装目录

basedir=D:\application\mysql

# 设置mysql数据库的数据的存放目录

datadir=D:\application\mysql\data

# 允许最大连接数

max_connections=200

# 服务端使用的字符集默认为8比特编码的latin1字符集

character-set-server=utf8

# 创建新表时将使用的默认存储引擎

default-storage-engine=INNODB

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

[mysql]

# 设置mysql客户端默认字符集

default-character-set=utf8

#代码结束

4.1、新建系统变量并配置变量值为 D:\application\mysql ；

以管理员身份运行命令提示符cmd（一定要用管理员身份运行，不然权限不够）输入如下命令：

mysqld --defaults-file=my.ini --initialize-insecure

mysqld--install

开始mysql服务：net start mysql 关闭mysql服务： net stop mysql

设置 mysql 的 root 密码，运行以下指令:mysql -u root -p 弹出的密码框可以咱时不用输入密码，直接按回车键 enter键 即可出现下面的页面。

然后我们修改一下mysql的登录密码：下面的代码逐一运行。

mysql -u root -p

use mysql;

update userset authentication_string=password('您的密码') where user='root';

flush privileges;

exit

至此，Mysql 8.0 winx64 解压缩版配置安装已经完成！

use （database name）即可

初次使用的时候，可以无法查询数据库中的表，等信息需要先创建一个数据库，在使用。这个报错原因是没有选择数据库！ 首先建立数据库，再在其中建立数据表：

创建的库为ruifeng,但是里面目前还没有表。

下面这些命令mysql常用的命令：

# status 状态

# net start mysql

# net stop mysql

# mysql-h localhost -u root -p 使用该命令访问mysql

# show databases; 查看mysql有哪些库

# use db; 切换数库

# show tables;查看有哪些表

# desc xxx; 查看表中有哪些字段

# show create table user \G: 查看创建表的脚本 信息

1.show databases;查看有哪些库

mysql>show databases;+--------------------+
| Database |
+--------------------+
| information_schema |
| bjpowernode |
| mysql |
| performance_schema |
| ruifeng |
| sys |
+--------------------+
6 rows in set (0.00 sec)

2.use mysql 使用mysql库

mysql>use mysql
Database changed
mysql> show tables;

3.show tables查看mysql库下面有哪些表

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 |
+---------------------------+

4.desc 字段；查看表中有哪些字段；

mysql>desc proc;+----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------+-----+---------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------+-----+---------------------+-----------------------------+
| db | char(64) | NO | PRI | | |
| name | char(64) | NO | PRI | | |
| type | enum('FUNCTION','PROCEDURE') | NO | PRI | NULL | |
| specific_name | char(64) | NO | | | |
| language | enum('SQL') | NO | | SQL | |
| sql_data_access | enum('CONTAINS_SQL','NO_SQL','READS_SQL_DATA','MODIFIES_SQL_DATA') | NO | | CONTAINS_SQL | |
| is_deterministic | enum('YES','NO') | NO | | NO | |
| security_type | enum('INVOKER','DEFINER') | NO | | DEFINER | |
| param_list | blob | NO | | NULL | |
| returns | longblob | NO | | NULL | |
| body | longblob | NO | | NULL | |
| definer | char(93) | NO | | | |
| created | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| modified | timestamp | NO | | 0000-00-00 00:00:00 | |
| sql_mode | set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES','ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER','HIGH_NOT_PRECEDENCE','NO_ENGINE_SUBSTITUTION','PAD_CHAR_TO_FULL_LENGTH') | NO | | | |
| comment | text | NO | | NULL | |
| character_set_client | char(32) | YES | | NULL | |
| collation_connection | char(32) | YES | | NULL | |
| db_collation | char(32) | YES | | NULL | |
| body_utf8 | longblob | YES | | NULL | |
+----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------+-----+---------------------+-----------------------------+
20 rows in set (0.00sec)
mysql>

5.show create table user \G: 查看创建表的脚本信息

mysql>show create table user \G:*************************** 1. row ***************************Table: user
Create Table: CREATE TABLE `user` (
`Host`char(60) COLLATE utf8_bin NOT NULL DEFAULT '',
`User`char(32) COLLATE utf8_bin NOT NULL DEFAULT '',
`Select_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Insert_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Update_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Delete_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Create_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Drop_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Reload_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Shutdown_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Process_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`File_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Grant_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`References_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Index_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Alter_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Show_db_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Super_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Create_tmp_table_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Lock_tables_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Execute_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Repl_slave_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Repl_client_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Create_view_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Show_view_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Create_routine_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Alter_routine_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Create_user_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Event_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Trigger_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Create_tablespace_priv`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`ssl_type`enum('','ANY','X509','SPECIFIED') CHARACTER SET utf8 NOT NULL DEFAULT '',
`ssl_cipher` blob NOT NULL,
`x509_issuer` blob NOT NULL,
`x509_subject` blob NOT NULL,
`max_questions`int(11) unsigned NOT NULL DEFAULT '0',
`max_updates`int(11) unsigned NOT NULL DEFAULT '0',
`max_connections`int(11) unsigned NOT NULL DEFAULT '0',
`max_user_connections`int(11) unsigned NOT NULL DEFAULT '0',
`plugin`char(64) COLLATE utf8_bin NOT NULL DEFAULT 'mysql_native_password',
`authentication_string` text COLLATE utf8_bin,
`password_expired`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`password_last_changed` timestamp NULL DEFAULT NULL,
`password_lifetime` smallint(5) unsigned DEFAULT NULL,
`account_locked`enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
PRIMARY KEY (`Host`,`User`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='Users and global privileges'
1 row in set (0.00sec)->exit;
ERROR1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ':
exit'at line 1
mysql>mysql>mysql>mysql>show create table ruifeng \G:
ERROR1146 (42S02): Table 'mysql.ruifeng' doesn't exist
-> mysql>desc proc;
ERROR1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ':
mysql> desc proc'at line 1
mysql> +----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------+-----+---------------------+-----------------------------+
-> | Field | Type | Null | Key | Default | Extra |
-> +----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------+-----+---------------------+-----------------------------+
-> | db | char(64) | NO | PRI | | |
-> | name | char(64) | NO | PRI | | |
-> | type | enum('FUNCTION','PROCEDURE') | NO | PRI | NULL | |
-> | specific_name | char(64) | NO | | | |
-> | language | enum('SQL') | NO | | SQL | |
-> | sql_data_access | enum('CONTAINS_SQL','NO_SQL','READS_SQL_DATA','MODIFIES_SQL_DATA') | NO | | CONTAINS_SQL | |
-> | is_deterministic | enum('YES','NO') | NO | | NO | |
-> | security_type | enum('INVOKER','DEFINER') | NO | | DEFINER | |
-> | param_list | blob | NO | | NULL | |
-> | returns | longblob | NO | | NULL | |
-> | body | longblob | NO | | NULL | |
-> | definer | char(93) | NO | | | |
-> | created | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
-> | modified | timestamp | NO | | 0000-00-00 00:00:00 | |
-> | sql_mode | set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES','ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER','HIGH_NOT_PRECEDENCE','NO_ENGINE_SUBSTITUTION','PAD_CHAR_TO_FULL_LENGTH') | NO | | | |
-> | comment | text | NO | | NULL | |
-> | character_set_client | char(32) | YES | | NULL | |
-> | collation_connection | char(32) | YES | | NULL | |
-> | db_collation | char(32) | YES | | NULL | |
-> | body_utf8 | longblob | YES | | NULL | |
-> +----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------+-----+---------------------+-----------------------------+
-> 20 rows in set (0.00sec)->
-> mysql>

mysql的演示我们到此结束了..........