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();

}

}