From 0cfd8c3e247cad9a80cd8d24c37e9ac7c3628532 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E8=94=A1=E5=98=89=E4=B9=90?= <3196825236@qq.com> Date: Wed, 11 Oct 2023 05:14:56 +0000 Subject: [PATCH] =?UTF-8?q?13=20=E8=94=A1=E5=98=89=E4=B9=90?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: 蔡嘉乐 <3196825236@qq.com> --- .../10.10\344\275\234\344\270\232.md" | 81 ++++++++++ .../if \350\257\255\345\217\245.md" | 147 ++++++++++++++++++ 2 files changed, 228 insertions(+) create mode 100644 "13 \350\224\241\345\230\211\344\271\220/13 \350\224\241\345\230\211\344\271\220/10.10\344\275\234\344\270\232.md" create mode 100644 "13 \350\224\241\345\230\211\344\271\220/13 \350\224\241\345\230\211\344\271\220/if \350\257\255\345\217\245.md" diff --git "a/13 \350\224\241\345\230\211\344\271\220/13 \350\224\241\345\230\211\344\271\220/10.10\344\275\234\344\270\232.md" "b/13 \350\224\241\345\230\211\344\271\220/13 \350\224\241\345\230\211\344\271\220/10.10\344\275\234\344\270\232.md" new file mode 100644 index 0000000..1c1d1ae --- /dev/null +++ "b/13 \350\224\241\345\230\211\344\271\220/13 \350\224\241\345\230\211\344\271\220/10.10\344\275\234\344\270\232.md" @@ -0,0 +1,81 @@ +```mysql +- 写一个存储过程，可以输入一个整数，输入小于或等于0时，提示非法输入，并中止这个存储过程， +-- 否则先判断这个数和是不是大于20，如果大于20就从1循环到这个数，并找出所有的偶数(但遇到逢10的数要跳过)。小于等于20就提示数太小了，并退出。 + +-- 要求，循环部分，要用三种语法分别做一遍 +#whlie +drop procedure xx; +delimiter // +CREATE procedure xx(in num int) +a:BEGIN +declare i int DEFAULt 1; + if num<=0 then + SELECT "非法输入"; + leave a; + elseif num > 20 then + b:while i<=num do + if i%2=1 or i%10=0 then set i = i+1; + iterate b ; + end if; + SELECT i; + set i = i+1; + end while b; + else SELECT "数太小了"; + leave a; +end if; +end // +delimiter ; +call xx (50) + +#loop +drop procedure zz; +delimiter // +CREATE procedure zz(in num int) +a:BEGIN +declare i int DEFAULt 1; + if num<=0 then + SELECT "非法输入"; + leave a; + elseif num > 20 then + b:loop + if i%2=1 or i%10=0 then set i = i+1; + iterate b ; + end if; + if i>num then leave b; + end if; + SELECT i; + set i = i+1; + end loop b; + else SELECT "数太小了"; + leave a; +end if; +end // +delimiter ; +call zz (50) +#repeat +drop procedure ff; +delimiter // +CREATE procedure ff(in num int) +a:BEGIN +declare i int DEFAULt 1; + if num<=0 then + SELECT "非法输入"; + leave a; + elseif num > 20 then + b:repeat + if i%2=1 or i%10=0 then set i = i+1; + iterate b ; + else SELECT i; + end if; + set i = i+1; + UNTIL i>num + end repeat b; + + else SELECT "数太小了"; + leave a; +end if; +end // +delimiter ; +call ff (100) +``` + diff --git "a/13 \350\224\241\345\230\211\344\271\220/13 \350\224\241\345\230\211\344\271\220/if \350\257\255\345\217\245.md" "b/13 \350\224\241\345\230\211\344\271\220/13 \350\224\241\345\230\211\344\271\220/if \350\257\255\345\217\245.md" new file mode 100644 index 0000000..8424d78 --- /dev/null +++ "b/13 \350\224\241\345\230\211\344\271\220/13 \350\224\241\345\230\211\344\271\220/if \350\257\255\345\217\245.md" @@ -0,0 +1,147 @@ +````mysql +## 笔记 + +### 循环 + +#### if循环 + +```mysql +if语法分支（表结构只能在储存过程中使用） +if 表达式1 then 操作1; +[elseif 表达式2 hten 操作2]..... +[else 操作]; +end if +``` + +#### case跟if循环一样 + +```mysql +case +when 值1 then 结果1或语句1（如果是语句，需要加分号） +when 值2 then 结果2或语句2（如果是语句，需要加分号） +when 值3 then 结果3或语句3（如果是语句，需要加分号） +... +else 结果n或语句n（如果是语句，需要加分号） +end [case] （如果是放在begin end中需要加上case，select后面不需要） +``` + +#### loop循环 + +```mysql +循环名: loop +循环执行的语句 +end loop 循环名 + +例如： +declare i int default 1 -- 起始变量 i=1 +a:loop + if i%2=0 then select i; + end if; + if i=num then leave a; -- leava a 则是退出循环，满足条件退出 + end if; + set i=i+1; -- 累加 +end loop a; +``` + +#### while循环 + +```mysql +declare i int default 1; + while i<=10 do select i;-- while 和 do 和Java差不多的 + set i=i+1; +end while; +``` + + + +#### 插入的数据 + +```mysql +CREATE DATABASE /*!32312 IF NOT EXISTS*/`view_db` /*!40100 DEFAULT CHARACTER SET utf8 */; + +USE `view_db`; + +CREATE TABLE `employees` ( + `employee_id` int(6) NOT NULL DEFAULT '0', + `first_name` varchar(20) DEFAULT NULL, + `last_name` varchar(25) NOT NULL, + `email` varchar(25) NOT NULL, + `phone_number` varchar(20) DEFAULT NULL, + `hire_date` date NOT NULL, + `job_id` varchar(10) NOT NULL, + `salary` double(8,2) DEFAULT NULL, + `commission_pct` double(2,2) DEFAULT NULL, + `manager_id` int(6) DEFAULT NULL, + `department_id` int(4) DEFAULT NULL, + PRIMARY KEY (`employee_id`), + UNIQUE KEY `emp_email_uk` (`email`), + UNIQUE KEY `emp_emp_id_pk` (`employee_id`), + KEY `emp_dept_fk` (`department_id`), + KEY `emp_job_fk` (`job_id`), + KEY `emp_manager_fk` (`manager_id`), + CONSTRAINT `emp_dept_fk` FOREIGN KEY (`department_id`) REFERENCES `departments` (`department_id`), + CONSTRAINT `emp_job_fk` FOREIGN KEY (`job_id`) REFERENCES `jobs` (`job_id`), + CONSTRAINT `emp_manager_fk` FOREIGN KEY (`manager_id`) REFERENCES `employees` (`employee_id`) +) ENGINE=InnoDB DEFAULT CHARSET=utf8; + +/*Data for the table `employees` */ + +insert into `employees`(`employee_id`,`first_name`,`last_name`,`email`,`phone_number`,`hire_date`,`job_id`,`salary`,`commission_pct`,`manager_id`,`department_id`) values (100,'Steven','King','SKING','515.123.4567','1987-06-17','AD_PRES',24000.00,NULL,NULL,90),(101,'Neena','Kochhar','NKOCHHAR','515.123.4568','1989-09-21','AD_VP',17000.00,NULL,100,90),(102,'Lex','De Haan','LDEHAAN','515.123.4569','1993-01-13','AD_VP',17000.00,NULL,100,90),(103,'Alexander','Hunold','AHUNOLD','590.423.4567','1990-01-03','IT_PROG',9000.00,NULL,102,60),(104,'Bruce','Ernst','BERNST','590.423.4568','1991-05-21','IT_PROG',6000.00,NULL,103,60),(105,'David','Austin','DAUSTIN','590.423.4569','1997-06-25','IT_PROG',4800.00,NULL,103,60),(106,'Valli','Pataballa','VPATABAL','590.423.4560','1998-02-05','IT_PROG',4800.00,NULL,103,60),(107,'Diana','Lorentz','DLORENTZ','590.423.5567','1999-02-07','IT_PROG',4200.00,NULL,103,60),(108,'Nancy','Greenberg','NGREENBE','515.124.4569','1994-08-17','FI_MGR',12000.00,NULL,101,100),(109,'Daniel','Faviet','DFAVIET','515.124.4169','1994-08-16','FI_ACCOUNT',9000.00,NULL,108,100),(110,'John','Chen','JCHEN','515.124.4269','1997-09-28','FI_ACCOUNT',8200.00,NULL,108,100),(111,'Ismael','Sciarra','ISCIARRA','515.124.4369','1997-09-30','FI_ACCOUNT',7700.00,NULL,108,100),(112,'Jose Manuel','Urman','JMURMAN','515.124.4469','1998-03-07','FI_ACCOUNT',7800.00,NULL,108,100),(113,'Luis','Popp','LPOPP','515.124.4567','1999-12-07','FI_ACCOUNT',6900.00,NULL,108,100),(114,'Den','Raphaely','DRAPHEAL','515.127.4561','1994-12-07','PU_MAN',11000.00,NULL,100,30),(115,'Alexander','Khoo','AKHOO','515.127.4562','1995-05-18','PU_CLERK',3100.00,NULL,114,30),(116,'Shelli','Baida','SBAIDA','515.127.4563','1997-12-24','PU_CLERK',2900.00,NULL,114,30),(117,'Sigal','Tobias','STOBIAS','515.127.4564','1997-07-24','PU_CLERK',2800.00,NULL,114,30),(118,'Guy','Himuro','GHIMURO','515.127.4565','1998-11-15','PU_CLERK',2600.00,NULL,114,30),(119,'Karen','Colmenares','KCOLMENA','515.127.4566','1999-08-10','PU_CLERK',2500.00,NULL,114,30),(120,'Matthew','Weiss','MWEISS','650.123.1234','1996-07-18','ST_MAN',8000.00,NULL,100,50),(121,'Adam','Fripp','AFRIPP','650.123.2234','1997-04-10','ST_MAN',8200.00,NULL,100,50),(122,'Payam','Kaufling','PKAUFLIN','650.123.3234','1995-05-01','ST_MAN',7900.00,NULL,100,50),(123,'Shanta','Vollman','SVOLLMAN','650.123.4234','1997-10-10','ST_MAN',6500.00,NULL,100,50),(124,'Kevin','Mourgos','KMOURGOS','650.123.5234','1999-11-16','ST_MAN',5800.00,NULL,100,50),(125,'Julia','Nayer','JNAYER','650.124.1214','1997-07-16','ST_CLERK',3200.00,NULL,120,50),(126,'Irene','Mikkilineni','IMIKKILI','650.124.1224','1998-09-28','ST_CLERK',2700.00,NULL,120,50),(127,'James','Landry','JLANDRY','650.124.1334','1999-01-14','ST_CLERK',2400.00,NULL,120,50),(128,'Steven','Markle','SMARKLE','650.124.1434','2000-03-08','ST_CLERK',2200.00,NULL,120,50),(129,'Laura','Bissot','LBISSOT','650.124.5234','1997-08-20','ST_CLERK',3300.00,NULL,121,50),(130,'Mozhe','Atkinson','MATKINSO','650.124.6234','1997-10-30','ST_CLERK',2800.00,NULL,121,50),(131,'James','Marlow','JAMRLOW','650.124.7234','1997-02-16','ST_CLERK',2500.00,NULL,121,50),(132,'TJ','Olson','TJOLSON','650.124.8234','1999-04-10','ST_CLERK',2100.00,NULL,121,50),(133,'Jason','Mallin','JMALLIN','650.127.1934','1996-06-14','ST_CLERK',3300.00,NULL,122,50),(134,'Michael','Rogers','MROGERS','650.127.1834','1998-08-26','ST_CLERK',2900.00,NULL,122,50),(135,'Ki','Gee','KGEE','650.127.1734','1999-12-12','ST_CLERK',2400.00,NULL,122,50),(136,'Hazel','Philtanker','HPHILTAN','650.127.1634','2000-02-06','ST_CLERK',2200.00,NULL,122,50),(137,'Renske','Ladwig','RLADWIG','650.121.1234','1995-07-14','ST_CLERK',3600.00,NULL,123,50),(138,'Stephen','Stiles','SSTILES','650.121.2034','1997-10-26','ST_CLERK',3200.00,NULL,123,50),(139,'John','Seo','JSEO','650.121.2019','1998-02-12','ST_CLERK',2700.00,NULL,123,50),(140,'Joshua','Patel','JPATEL','650.121.1834','1998-04-06','ST_CLERK',2500.00,NULL,123,50),(141,'Trenna','Rajs','TRAJS','650.121.8009','1995-10-17','ST_CLERK',3500.00,NULL,124,50),(142,'Curtis','Davies','CDAVIES','650.121.2994','1997-01-29','ST_CLERK',3100.00,NULL,124,50),(143,'Randall','Matos','RMATOS','650.121.2874','1998-03-15','ST_CLERK',2600.00,NULL,124,50),(144,'Peter','Vargas','PVARGAS','650.121.2004','1998-07-09','ST_CLERK',2500.00,NULL,124,50),(145,'John','Russell','JRUSSEL','011.44.1344.429268','1996-10-01','SA_MAN',14000.00,0.40,100,80),(146,'Karen','Partners','KPARTNER','011.44.1344.467268','1997-01-05','SA_MAN',13500.00,0.30,100,80),(147,'Alberto','Errazuriz','AERRAZUR','011.44.1344.429278','1997-03-10','SA_MAN',12000.00,0.30,100,80),(148,'Gerald','Cambrault','GCAMBRAU','011.44.1344.619268','1999-10-15','SA_MAN',11000.00,0.30,100,80),(149,'Eleni','Zlotkey','EZLOTKEY','011.44.1344.429018','2000-01-29','SA_MAN',10500.00,0.20,100,80),(150,'Peter','Tucker','PTUCKER','011.44.1344.129268','1997-01-30','SA_REP',10000.00,0.30,145,80),(151,'David','Bernstein','DBERNSTE','011.44.1344.345268','1997-03-24','SA_REP',9500.00,0.25,145,80),(152,'Peter','Hall','PHALL','011.44.1344.478968','1997-08-20','SA_REP',9000.00,0.25,145,80),(153,'Christopher','Olsen','COLSEN','011.44.1344.498718','1998-03-30','SA_REP',8000.00,0.20,145,80),(154,'Nanette','Cambrault','NCAMBRAU','011.44.1344.987668','1998-12-09','SA_REP',7500.00,0.20,145,80),(155,'Oliver','Tuvault','OTUVAULT','011.44.1344.486508','1999-11-23','SA_REP',7000.00,0.15,145,80),(156,'Janette','King','JKING','011.44.1345.429268','1996-01-30','SA_REP',10000.00,0.35,146,80),(157,'Patrick','Sully','PSULLY','011.44.1345.929268','1996-03-04','SA_REP',9500.00,0.35,146,80),(158,'Allan','McEwen','AMCEWEN','011.44.1345.829268','1996-08-01','SA_REP',9000.00,0.35,146,80),(159,'Lindsey','Smith','LSMITH','011.44.1345.729268','1997-03-10','SA_REP',8000.00,0.30,146,80),(160,'Louise','Doran','LDORAN','011.44.1345.629268','1997-12-15','SA_REP',7500.00,0.30,146,80),(161,'Sarath','Sewall','SSEWALL','011.44.1345.529268','1998-11-03','SA_REP',7000.00,0.25,146,80),(162,'Clara','Vishney','CVISHNEY','011.44.1346.129268','1997-11-11','SA_REP',10500.00,0.25,147,80),(163,'Danielle','Greene','DGREENE','011.44.1346.229268','1999-03-19','SA_REP',9500.00,0.15,147,80),(164,'Mattea','Marvins','MMARVINS','011.44.1346.329268','2000-01-24','SA_REP',7200.00,0.10,147,80),(165,'David','Lee','DLEE','011.44.1346.529268','2000-02-23','SA_REP',6800.00,0.10,147,80),(166,'Sundar','Ande','SANDE','011.44.1346.629268','2000-03-24','SA_REP',6400.00,0.10,147,80),(167,'Amit','Banda','ABANDA','011.44.1346.729268','2000-04-21','SA_REP',6200.00,0.10,147,80),(168,'Lisa','Ozer','LOZER','011.44.1343.929268','1997-03-11','SA_REP',11500.00,0.25,148,80),(169,'Harrison','Bloom','HBLOOM','011.44.1343.829268','1998-03-23','SA_REP',10000.00,0.20,148,80),(170,'Tayler','Fox','TFOX','011.44.1343.729268','1998-01-24','SA_REP',9600.00,0.20,148,80),(171,'William','Smith','WSMITH','011.44.1343.629268','1999-02-23','SA_REP',7400.00,0.15,148,80),(172,'Elizabeth','Bates','EBATES','011.44.1343.529268','1999-03-24','SA_REP',7300.00,0.15,148,80),(173,'Sundita','Kumar','SKUMAR','011.44.1343.329268','2000-04-21','SA_REP',6100.00,0.10,148,80),(174,'Ellen','Abel','EABEL','011.44.1644.429267','1996-05-11','SA_REP',11000.00,0.30,149,80),(175,'Alyssa','Hutton','AHUTTON','011.44.1644.429266','1997-03-19','SA_REP',8800.00,0.25,149,80),(176,'Jonathon','Taylor','JTAYLOR','011.44.1644.429265','1998-03-24','SA_REP',8600.00,0.20,149,80),(177,'Jack','Livingston','JLIVINGS','011.44.1644.429264','1998-04-23','SA_REP',8400.00,0.20,149,80),(178,'Kimberely','Grant','KGRANT','011.44.1644.429263','1999-05-24','SA_REP',7000.00,0.15,149,NULL),(179,'Charles','Johnson','CJOHNSON','011.44.1644.429262','2000-01-04','SA_REP',6200.00,0.10,149,80),(180,'Winston','Taylor','WTAYLOR','650.507.9876','1998-01-24','SH_CLERK',3200.00,NULL,120,50),(181,'Jean','Fleaur','JFLEAUR','650.507.9877','1998-02-23','SH_CLERK',3100.00,NULL,120,50),(182,'Martha','Sullivan','MSULLIVA','650.507.9878','1999-06-21','SH_CLERK',2500.00,NULL,120,50),(183,'Girard','Geoni','GGEONI','650.507.9879','2000-02-03','SH_CLERK',2800.00,NULL,120,50),(184,'Nandita','Sarchand','NSARCHAN','650.509.1876','1996-01-27','SH_CLERK',4200.00,NULL,121,50),(185,'Alexis','Bull','ABULL','650.509.2876','1997-02-20','SH_CLERK',4100.00,NULL,121,50),(186,'Julia','Dellinger','JDELLING','650.509.3876','1998-06-24','SH_CLERK',3400.00,NULL,121,50),(187,'Anthony','Cabrio','ACABRIO','650.509.4876','1999-02-07','SH_CLERK',3000.00,NULL,121,50),(188,'Kelly','Chung','KCHUNG','650.505.1876','1997-06-14','SH_CLERK',3800.00,NULL,122,50),(189,'Jennifer','Dilly','JDILLY','650.505.2876','1997-08-13','SH_CLERK',3600.00,NULL,122,50),(190,'Timothy','Gates','TGATES','650.505.3876','1998-07-11','SH_CLERK',2900.00,NULL,122,50),(191,'Randall','Perkins','RPERKINS','650.505.4876','1999-12-19','SH_CLERK',2500.00,NULL,122,50),(192,'Sarah','Bell','SBELL','650.501.1876','1996-02-04','SH_CLERK',4000.00,NULL,123,50),(193,'Britney','Everett','BEVERETT','650.501.2876','1997-03-03','SH_CLERK',3900.00,NULL,123,50),(194,'Samuel','McCain','SMCCAIN','650.501.3876','1998-07-01','SH_CLERK',3200.00,NULL,123,50),(195,'Vance','Jones','VJONES','650.501.4876','1999-03-17','SH_CLERK',2800.00,NULL,123,50),(196,'Alana','Walsh','AWALSH','650.507.9811','1998-04-24','SH_CLERK',3100.00,NULL,124,50),(197,'Kevin','Feeney','KFEENEY','650.507.9822','1998-05-23','SH_CLERK',3000.00,NULL,124,50),(198,'Donald','OConnell','DOCONNEL','650.507.9833','1999-06-21','SH_CLERK',2600.00,NULL,124,50),(199,'Douglas','Grant','DGRANT','650.507.9844','2000-01-13','SH_CLERK',2600.00,NULL,124,50),(200,'Jennifer','Whalen','JWHALEN','515.123.4444','1987-09-17','AD_ASST',4400.00,NULL,101,10),(201,'Michael','Hartstein','MHARTSTE','515.123.5555','1996-02-17','MK_MAN',13000.00,NULL,100,20),(202,'Pat','Fay','PFAY','603.123.6666','1997-08-17','MK_REP',6000.00,NULL,201,20),(203,'Susan','Mavris','SMAVRIS','515.123.7777','1994-06-07','HR_REP',6500.00,NULL,101,40),(204,'Hermann','Baer','HBAER','515.123.8888','1994-06-07','PR_REP',10000.00,NULL,101,70),(205,'Shelley','Higgins','SHIGGINS','515.123.8080','1994-06-07','AC_MGR',12000.00,NULL,101,110),(206,'William','Gietz','WGIETZ','515.123.8181','1994-06-07','AC_ACCOUNT',8300.00,NULL,205,110); +``` + +#### 作业 + +```mysql + +-#1. 创建函数test_if_case()，实现传入成绩，如果成绩>90,返回A，如果成绩>80,返回B，如果成绩>60,返回C，否则返回D +#要求：分别使用if结构和case结构实现 + +#方式1：if +use view_db; +delimiter // + create procedure test_if_case(in grande double(4,1)) + begin + if grande < 0 or grande > 100 then select '非法输入'; + elseif grande > 90 then select 'A'; + elseif grande > 80 then select 'B'; + elseif grande > 60 then select 'C'; + else select 'D'; + end if; + end // +delimiter; +call test_if_case(101); + +#方式2：case when ... +drop procedure test_if_case; +delimiter // + create procedure test_if_case(in grande double(4,1)) + begin + case + when grande < 0 or grande > 100 then select '非法输入'; + when grande > 90 then select 'A'; + when grande > 80 then select 'B'; + when grande > 60 then select 'C'; + else select 'D'; + end case; + end // +delimiter; +call test_if_case(101); + +#2. 创建存储过程test_if_pro()，传入工资值，如果工资值<3000,则删除工资为此值的员工， +# 如果3000 <= 工资值 <= 5000,则修改此工资值的员工薪资涨1000，否则涨工资500 +drop procedure test_if_pro; +delimiter // + create procedure test_if_pro(in money double(5,1)) + begin + select * from employees; + if money < 3000 then delete from employees where salary < 3000; + elseif money >= 3000 and money <= 5000 then update employees set salary = salary + 1000 where salary between 3000 and 5000; + else update employees set salary = salary + 500; + end if; + select * from employees; + end // +delimiter; +call test_if_pro(3000); +``` +```` + -- Gitee