SQLServer创建表，插入数据，查询，创建触发器，存储过程

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(1,1) primary key,–设主键，为自增id
c_className varchar(20) not null
)
create table student_Score
(
ss_id int identity(1,1) primary key,–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();
}
}