DB2视图、序列、约束、外键练习测试_PHP教程

DB2视图、序列、约束、外键练习测试

简单视图：

db2 => create view myview1 as select * from t1 where empnoDB20000I SQL 命令成功完成。
db2 => select * from myview1


EMPNO NAME SEQNO
----------- ---------- -----------
10 wan qi 1
30 xu xin 3
50 bbbb 6


3 条记录已选择。


简单序列


db2 => create sequence myseq start with 1 increment by 1 cache 5
DB20000I SQL 命令成功完成。


db2 => insert into tank1 values(nextval for myseq,'asdf')
DB20000I SQL 命令成功完成。
db2 => select * from tank1


ID NAME
----------- ----------
2 asdf
3 asdf
4 asdf
5 asdf
6 asdf
7 asdf
8 asdf



简单约束实验

create table employee
(
ID integer not null constraint ID_pk primary key,
NAME varchar(9),
DEPT smallint constraint dept_ck1
check (dept between 10 and 100),
JOB char(5) constraint dept_ck2
check (JOB IN('Sales','Mgr','Clerk')),
HIREDATE date,
SALARY decimal(7,2),
constraint yearsal_ck
check (year(HIREDATE) > 1986 OR SALARY > 40000 )


)


[db2inst2@localhost ~]$ db2 "insert into employee values(1,'asdf',11, 'Sales','1788-02-10',40100)"
DB20000I SQL 命令成功完成。
[db2inst2@localhost ~]$ db2 "insert into employee values(1,'asdf',13, 'Sales','1788-02-10',40100)"
DB21034E 该命令被当作 SQL
语句来处理，因为它是无效的“命令行处理器”命令。在 SQL
处理期间，它返回：
SQL0803N INSERT 语句、UPDATE 语句或由 DELETE
语句导致的外键更新中的一个或多个值无效，因为由 "1"
标识的主键、唯一约束或者唯一索引将表 "DB2INST2.EMPLOYEE"
的索引键限制为不能具有重复值。 SQLSTATE=23505
[db2inst2@localhost ~]$ db2 "insert into employee values(2,'asdf',101, 'Sales','1788-02-10',40100)"
DB21034E 该命令被当作 SQL
语句来处理，因为它是无效的“命令行处理器”命令。在 SQL
处理期间，它返回：
SQL0545N 因为行不满足检查约束
"DB2INST2.EMPLOYEE.DEPT_CK1"，所以不允许所请求的操作。
SQLSTATE=23513
[db2inst2@localhost ~]$ db2 "insert into employee values(2,'asdf',99, 'Sales','1788-02-10',40100)"
DB20000I SQL 命令成功完成。
[db2inst2@localhost ~]$ db2 "insert into employee values(3,'asdf',99, 'Kales','1788-02-10',40100)"
DB21034E 该命令被当作 SQL
语句来处理，因为它是无效的“命令行处理器”命令。在 SQL
处理期间，它返回：
SQL0545N 因为行不满足检查约束
"DB2INST2.EMPLOYEE.DEPT_CK2"，所以不允许所请求的操作。
SQLSTATE=23513
[db2inst2@localhost ~]$ db2 "insert into employee values(3,'asdf',99, 'Sales','1788-02-10',40100)"
DB20000I SQL 命令成功完成。
[db2inst2@localhost ~]$ db2 "insert into employee values(4,'asdf',98, 'Mgr','1788-02-10',40100)"
DB20000I SQL 命令成功完成。
[db2inst2@localhost ~]$ db2 "insert into employee values(5,'asdf',98, 'Mgr','1987-02-10',40)"
DB20000I SQL 命令成功完成。
[db2inst2@localhost ~]$ db2 "insert into employee values(6,'asdf',98, 'Mgr','1984-02-10',40)"
DB21034E 该命令被当作 SQL
语句来处理，因为它是无效的“命令行处理器”命令。在 SQL
处理期间，它返回：
SQL0545N 因为行不满足检查约束
"DB2INST2.EMPLOYEE.YEARSAL_CK"，所以不允许所请求的操作。
SQLSTATE=23513
[db2inst2@localhost ~]$ db2 "insert into employee values(6,'asdf',98, 'Mgr','1981-02-10',41000)"
DB20000I SQL 命令成功完成。
[db2inst2@localhost ~]$ db2 "insert into employee values(6,'asdf',98, 'Mgr','1981-02-10',41000)"



简单主外键测试

1、查看约束：

SELECT * FROM SYSCAT.TABCONST

2、新建父表：

create table shopper.salesboys(sid int not null, name
varchar(40) not null, salary double not null, constraint
pk_boy_id primary key (sid));


3、新建子表：

create table employee.salesboys(
sid int,
name varchar(30) not null,
phone int not null,
constraint fk_boy_id
foreign key(sid)
references shopper.salesboys (sid)
on delete restrict //限制删除
);

4、父表插入数据，，

[db2inst2@localhost ~]$ more inste2.sql
insert into shopper.salesboys values(100,'raju',20000.00),
(101,'kiran',15000.00),
(102,'radha',10000.00),
(103,'wali',20000.00),
(104,'rayan',15000.00)
;

5、子表插入数据

[db2inst2@localhost ~]$ more inste3.sql
insert into employee.salesboys values(100,'raju',98998976),
(101,'kiran',98911176),
(102,'radha',943245176),
(103,'wali',89857330),
(104,'rayan',89851130);

6、测试外建约束：


[db2inst2@localhost ~]$ db2 "insert into employee.salesboys values(103,'rayan',89851130)"
DB20000I SQL 命令成功完成。
[db2inst2@localhost ~]$ db2 "insert into employee.salesboys values(109,'rayan',89851130)"
DB21034E 该命令被当作 SQL
语句来处理，因为它是无效的“命令行处理器”命令。在 SQL
处理期间，它返回：
SQL0530N FOREIGN KEY "EMPLOYEE.SALESBOYS.FK_BOY_ID"
的插入或更新值不等于父表的任何父键值。 SQLSTATE=23503
[db2inst2@localhost ~]$


7、删除外建测试

[db2inst2@localhost ~]$ db2 "ALTER TABLE EMPLOYEE.SALESBOYS DROP FOREIGN KEY FK_BOY_ID"
DB20000I SQL 命令成功完成。
[db2inst2@localhost ~]$ db2 "insert into employee.salesboys values(109,'rayan',89851130)"
DB20000I SQL 命令成功完成。
[db2inst2@localhost ~]$

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