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建数据库
create database school
--建表
use school
create table students
(
?s_id int identity(1,1) primary key,--设主键，为自增id
?s_name varchar(20) not null,
?s_classId int
)
create table class
(
?c_id int identity(1,--设主键，为自增id
?c_className varchar(20) not null
)
create table student_Score
(
?ss_id? int identity(1,--设主键，为自增id
?ss_score varchar(200) not null,
?s_id int
)
--设外键
use school
alter table students add constraint FK_class_studets foreign key(s_classId)references class(c_id)
--设外键
use school
alter table student_Score add constraint FK_students_student_Score foreign key(s_id)references students(s_id)
--插class数据
insert into class(c_className) values('08ACCP1班')
insert into class(c_className) values('08ACCP2班')
insert into class(c_className) values('08ACCP3班')
insert into class(c_className) values('08ACCP4班')
insert into class(c_className) values('08网编1班')
insert into class(c_className) values('08网编2班')
insert into class(c_className) values('08软开1班')
insert into class(c_className) values('08软开2班')
insert into class(c_className) values('08软开3班')
insert into class(c_className) values('08信管1班')
--插studets数据
insert into students(s_name,s_classId) values('陈志锦',2)
insert into students(s_name,s_classId) values('何金喜',4)
insert into students(s_name,s_classId) values('黄瑞驰',5)
--单表查询
--查studets表
select * from students
--查class表
select * from class
--多表查询
--内联接查询
--情况1：
select * from students as s,class as c where s.s_classId=c.c_id
--情况2：
select * from students as s inner join class as c? on(s.s_classId=c.c_id)
--外联接查询
--左外联接
select * from students as s left outer join class as c on s.s_classId=c.c_id
select * from class as c left outer join students as s on s.s_classId=c.c_id
--右外联接
select * from students as s right outer join class as c on s.s_classId=c.c_id
select * from class? as c right outer join students as s on s.s_classId=c.c_id
--全联接
select * from students as s? full outer join? class as c? on s.s_classId=c.c_id
select * from class as c? full? outer join? students as s on s.s_classId=c.c_id
--交叉查询
SELECT * FROM? students?? CROSS?? JOIN?? class
SELECT * FROM? class?? CROSS?? JOIN?? students
--触发器
/*-------触发器------*/
/*触发器是一种特殊的存储过程，
触发器是在对表进行插入、更新或删除操作时自动执行的存储过程
触发器通常用于强制业务规则
触发器是一种高级约束，可以定义比用CHECK 约束更为复杂的约束
可执行复杂的SQL语句（if/while/case）
可引用其它表中的列
*/
/*
DELETE 触发器
INSERT 触发器
UPDATE 触发器
*/
/*----------Insert 插入 触发器------------*/
Create Trigger Tri_insert
on students /*针对某个表，触发器是建立在表关系上的*/
for insert /*采用的是哪种触发器*/
as
?declare @stu_id int;
?declare @stu_score varchar(200);
?select @stu_id=s_id from inserted /*这里的Inserted 是在创建触发器时候 系统自动创建的内存表*/
?insert into student_Score(s_id,ss_score)values(@stu_id,'100')
go
--就是插一条数据进入students中，Tri_insert触发器就会自动在student_Score插入相关的学生的一条分数的数据
insert into students(s_name,s_classId) values('黄驰',6)
select * from student_Score
--存储过程
/*
存储过程
1.不带参数的存储过程
2.带参数的存储过程
*/
--不带参数的存储过程
create procedure pro_selStu
as
? select * from students;
go
--下面是测试存储过程
execute pro_selStu;
--带参数的存储过程
/*（1）带输入参数的存储过程 */
Create procedure pro_stu @stu_id int
as
?select * from students where s_id=@stu_id
go
--下面是测试存储过程
execute pro_stu 1;
/*（2）带输出参数的存储过程*/
Create procedure pro_stu_output @stu_sum int output,@stu_down_count int,@stu_up_count int
as
?select @stu_sum=count(*) from students where s_id between @stu_down_count and @stu_up_count
go
--下面是测试存储过程
declare @stu_sum int
execute pro_stu_output @stu_sum output,1,4 /*在调用含有输出参数的存储过程时 要注意*/
print @stu_sum
?
?
带参数的存储过程在Java中的应用：
/**
create ? procedure ? ShipVia_Sum
@via ? int,
@sum ? money ? output
as
select ? @sum ? = ? sum(freight) ? from ? orders
where ? shipVia ? = ? @via
**/
?
public ? static ? void ? procedureOutput() ? { try ? { Connection ? conn ? = ? JDBC_ODBC.getConnection(); System.out.println( "conn ? is: " ? + ? conn); String ? call ? = ? "{call ? ShipVia_Sum(?,?)} "; CallableStatement ? cs ? = ? conn.prepareCall(call); cs.setInt(1,? 1); cs.registerOutParameter(2,? java.sql.Types.DOUBLE); cs.execute(); System.out.println(cs.getDouble(2)); } ? catch ? (Exception ? ex) ? { ex.printStackTrace(); } }
（编辑：李大同）
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