1.MYSQL 語言的分類

(1) DDL 數據庫定義

(2) DQL 數據庫查詢

(3) DML 數據庫操作

(4) DCL? 數據庫權限

2.MYSQL? 操作

(1) 創建數據庫mysql>?create?database?cmdb?default?charset?utf8;

(2)查看所有的數據庫mysql>?show?databases;

+--------------------+

|?Database???????????|

+--------------------+

|?information_schema?|

|?cmdb???????????????|

|?mysql??????????????|

|?performance_schema?|

|?sys????????????????|

+--------------------+

5?rows?in?set?(0.00?sec)

(3) 使用cmdb數據庫mysql>?use?cmdb;

(4) 查看數據庫的創建語法mysql>?show?create?database?cmdb;

(5) 刪除數據庫mysql>?drop?database?cmdb;

(6) 查看所有的表mysql>?show?tables;

(7)? 創建用戶表mysql>?create?table?user(id?int,name?varchar(64),age?int,?sex?boolean,telphone?varchar(32),?addr?varchar(512))engine=innodb?default?charset?utf8;

(8)? 查看創建表的過程mysql>?show?create?table?user;

(9)? 刪除表mysql>?drop?table?user;

(10)? 查看表結構mysql>?desc?user;

(11)? 插入數據mysql>?insert?into?user(id,name,age,sex,telphone,addr)values(1,'李寬',25,1,'18829787559','陜西省西安市');

(12)? 查看數據mysql>?select?*?from?user;

(13)? 只查詢指定的列mysql>?select?name,addr?from?user;

(14)? 條件查詢

where

邏輯關聯詞? and? or

關系表達式? >? =? <=? !=

like表達式

(1) % 占多位? ? 'abc%'? ?'%abc'

(2) _ 占一位? ? ? ‘abc_’ '_abc'

in 的使用? ? ? ?colname? in (a,b)

not in 的使用? ?colname not in (a,b)select?name,age,addr?from?user?where?addr?=?'陜西省西安市'?and?age=25;

mysql>?select?name,age,addr?from?user?where?addr?=?'陜西省西安市'?or?age?=?25;

select?name,age,addr?from?user?where?addr?=?'陜西省西安市'?or?age?>?25;

mysql>?select?name,age,addr?from?user?where?age?>=?25;

mysql>?select?name,age,addr?from?user?where?age?!=?25;

select?name,age,addr?from?user?where?age?

mysql>?select?name,age,addr?from?user?where?addr?like?'陜西省%';

mysql>?select?name,age,addr?from?user?where?addr?like?'%市';

mysql>?select?name,age,addr?from?user?where?not?(addr?like?'臨汾市');

mysql>?select?name,age,addr?from?user?where?age?in?(23,25);

mysql>?select?name,sex,age,addr?from?user?where?age?not?in?(15,25);

(15)? 查詢總數mysql>?select?count(*)?from?user;

3.創建CMDB的用戶表

建表的sql，性別在數據庫中存儲的時候，男存1，女存0CREATE?TABLE?user(

id?int?primary?key?auto_increment,

name?varchar(32)?unique?not?null?default?'',

password?varchar(512)?not?null?default?'',

age?int?not?null?default?18,

sex?boolean?not?null?default?1,

tel?varchar(16)?not?null?default?'',

addr?text,

add_time?datetime

)ENGINE=INNODB?DEFAULT?CHARSET?utf8mb4;

批量插入測試數據insert?into?user(name,?password,?age,?sex,?tel,?addr,?add_time)?values?('kk',?md5('kk'),?30,?1,?'15200000000',?'西安市',?now()),\

('woniu',?md5('woniu'),?30,?1,?'15200000001',?'北京市',?now()),('zhangzhengguang',?md5('zhangzhengguang'),?30,?1,?'15200000003',?'杭州市',?now()),\

('likuan',?md5('likuan'),?30,?1,?'15200000002',?'西安市',?now())

查看用戶登錄的用戶名和密碼mysql>?select?name,password?from?user?where?name='likuan'?and?password=md5('likuan');

查找所有的數據mysql>?select?id,name,password,age,sex,tel,addr?from?user?;

限制查詢的數據 (limit可以用來做分頁)mysql>?select?id,name,password,age,sex,tel,addr?from?user?limit?1;

Limit?和?offset結合使用mysql>?select?id,name,password,age,sex,tel,addr?from?user?limit?2?offset?2;

排序 (降序和升序)

降序(desc)Mysql>?select?id,name,password,age,sex,tel,addr?from?user?order?by?age?desc;

升序(asc)mysql>?select?id,name,password,age,sex,tel,addr?from?user?order?by?age?asc;

更新操作mysql>?update?user?set?age=15?where?id?=?3;

mysql>?update?user?set?name='kk',tel='152',sex=1,addr='西安市'?where?id?=?1;

刪除操作mysql>?delete?from?user?where?id?=?1;

mysql>?delete?from?user;

聚合函數mysql>?select?max(age),min(age),avg(age),count(age),sum(age)?from?user;

分類統計mysql>?select?addr,?count(*)?from?user?group?by?addr;

mysql>?select?addr,age,?count(*)?from?user?group?by?addr,age;

4.Python代碼里操作mysql

首先需要安裝mysql的開發包? ?mysql-devel

其次pip安裝 mysqlclient

使用是導入包? MysqlSQLdb

Python操作mysql的七步

(1)導入模塊import?MySQLdb

(2)創建連接conn=MySQLdb.connect(host='127.0.0.1',port=3306,user='root',passwd='passwd',db='cmdb')

(3)獲取游標cursor?=?conn.cursor()

(4)執行sql(DQL 和 DML)

DQL

返回符合條件的個數cursor.execute("select?id,name?from?user?where?name='likuan'?and?password=md5('likuan');")

DMLcursor.execute("update?user?set?age?=?35?where?id?=?1")

(5)DQL獲取結果 、DML提交執行

DQL(元組)cursor.fetchall()

cursor.fetchone()

>>>?cursor.fetchall()

(('kk',),?('likuan',),?('woniu',),?('zhangzhengguang',))

DML 提交conn.commit()

(6)關閉游標cursor.close()

(7)關閉連接conn.close()

5.提交sql采用預處理的方式(預防sql注入)

(1)將操作和數據分開

(2)兩個變量，一個是sql操作，一個是對應的數據

(3)只有數據才可以占位，操作不能占位

標簽：addr,運維,Python,age,Mysql,user,mysql,select,name

來源： https://blog.51cto.com/12217124/2359822

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