function、procedure

#新建库
create database bigdata;
use bigdata;


#新建表dept
create table dept(
id int unsigned primary key auto_increment,
deptno mediumint unsigned not null default 0,
dname varchar(20) not null default "",
loc varchar(13) not null default ""
)engine=innodb default charset=gbk;



#新建表emp
create table emp(
id int unsigned primary key auto_increment,
empno mediumint unsigned not null default 0,/*编号*/
ename varchar(20) not null default "",/*名字*/
job varchar(9) not null default "",/*工作*/
mgr mediumint unsigned not null default 0,/*上级编号*/
hiredate date not null,/*入职时间*/
sal decimal(7,2) not null,/*薪水*/
comm decimal(7,2) not null,/*红利*/
deptno mediumint unsigned not null default 0/*部门编号*/
)engine=innodb default charset=gbk;



#开启过慢查询日志
show variables like 'log_bin_trust_function_creators';
set global log_bin_trust_function_creators=1;


#创建函数rand_string--用于随机产生员工姓名或者部门名
Delimiter $$
Create function rand_string(n int) returns varchar(255)
Begin
    Declare chars_str varchar(100) default 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    Declare return_str varchar(255) default '';
    Declare i int default 0;
    While i < n do
    Set return_str=concat(return_str,substring(chars_str,floor(1+rand()*52),1));
    Set i=i+1;
    End while;
    Return return_str;
End $$

#删除函数
#drop function rand_string;


#创建函数rand_num--用于随机产生员工对应的部门编号
delimiter $$
create function rand_num()
returns int(5)
begin
    declare i int default 0;
    set i = floor(100+rand()*10);
    return i;
end $$


#创建向emp表插入数据的存储过程insert_emp
delimiter $$
create procedure insert_emp(in start int(10),in max_num int(10))
begin
declare i int default 0;
set autocommit = 0;
repeat
set i = i+1;
insert into emp (empno,ename,job,mgr,hiredate,sal,comm,deptno)values((start+i),
rand_string(6),'SALESMAN',0001,curdate(),2000,400,rand_num());
until i=max_num
end repeat;
commit;
end $$


#创建向dept表插入数据的存储过程insert_dept
delimiter $$
create procedure insert_dept(in start int(10),in max_num int(10))
begin
declare i int default 0;
set autocommit = 0;
repeat
set i = i+1;
insert into dept (deptno,dname,loc)values((start+i),
rand_string(10),rand_string(8));
until i=max_num
end repeat;
commit;
end $$

#调用存储过程insert_dept,100表示部门编号从100开始，10表示插入10条数据
call insert_dept(100,1000000);

存储过程示例：

DELIMITER &&
CREATE PROCEDURE pro_user()
    BEGIN
     DECLARE a,b VARCHAR(20) ;
     INSERT INTO t_user VALUES(NULL,a,b);
    END
&&
DELIMITER ;

DELIMITER &&
CREATE PROCEDURE pro_user2()
    BEGIN
     DECLARE a,b VARCHAR(20) ;
     SET a='java1234',b='123456';
     INSERT INTO t_user VALUES(NULL,a,b);
    END
&&
DELIMITER ;

DELIMITER &&
CREATE PROCEDURE pro_user3()
    BEGIN
     DECLARE a,b VARCHAR(20) ;
     SELECT userName2,password2 INTO a,b FROM t_user2 WHERE id2=1;
     INSERT INTO t_user VALUES(NULL,a,b);
    END
&&
DELIMITER ;


DELIMITER &&
CREATE PROCEDURE pro_user4()
    BEGIN
     DECLARE a,b VARCHAR(20) ;
     DECLARE cur_t_user2 CURSOR FOR SELECT userName2,password2 FROM t_user2;
     OPEN cur_t_user2;
     FETCH cur_t_user2 INTO a,b;
     INSERT INTO t_user VALUES(NULL,a,b);
     CLOSE cur_t_user2;
    END
&&
DELIMITER ;

DELIMITER &&
CREATE PROCEDURE pro_user5(IN bookId INT)
    BEGIN
     SELECT COUNT(*) INTO @num FROM t_user WHERE id=bookId;
     IF @num>0 THEN UPDATE t_user SET userName='java12345' WHERE id=bookId;
     ELSE
       INSERT INTO t_user VALUES(NULL,'2312312','2321312');
     END IF ;
    END
&&
DELIMITER ;

DELIMITER &&
CREATE PROCEDURE pro_user6(IN bookId INT)
    BEGIN
     SELECT COUNT(*) INTO @num FROM t_user WHERE id=bookId;
     CASE @num
      WHEN 1 THEN UPDATE t_user SET userName='java12345' WHERE id=bookId;
      WHEN 2 THEN INSERT INTO t_user VALUES(NULL,'2312312','2321312');
      ELSE INSERT INTO t_user VALUES(NULL,'231231221321312','2321312321312');
     END CASE ;
    END
&&
DELIMITER ;


DELIMITER &&
CREATE PROCEDURE pro_user7(IN totalNum INT)
    BEGIN
      aaa:LOOP
        SET totalNum=totalNum-1;
        IF totalNum=0 THEN LEAVE aaa ;
        ELSE INSERT INTO t_user VALUES(totalNum,'2312312','2321312');
        END IF ;
      END LOOP aaa ;
    END
&&
DELIMITER ;



DELIMITER &&
CREATE PROCEDURE pro_user8(IN totalNum INT)
    BEGIN
      aaa:LOOP
        SET totalNum=totalNum-1;
        IF totalNum=0 THEN LEAVE aaa ;
        ELSEIF totalNum=3 THEN ITERATE aaa ;
        END IF ;
        INSERT INTO t_user VALUES(totalNum,'2312312','2321312');
      END LOOP aaa ;
    END
&&
DELIMITER ;

DELIMITER &&
CREATE PROCEDURE pro_user9(IN totalNum INT)
    BEGIN
      REPEAT
         SET totalNum=totalNum-1;
         INSERT INTO t_user VALUES(totalNum,'2312312','2321312');
         UNTIL totalNum=1
      END REPEAT;
    END
&&
DELIMITER ;

DELIMITER &&
CREATE PROCEDURE pro_user10(IN totalNum INT)
    BEGIN
     WHILE totalNum>0 DO
      INSERT INTO t_user VALUES(totalNum,'2312312','2321312');
      SET totalNum=totalNum-1;
     END WHILE ;
    END
&&
DELIMITER ;

CALL pro_user();

CALL pro_user2();

CALL pro_user3();

CALL pro_user4();

CALL pro_user5(5);

CALL pro_user6(6);

CALL pro_user7(11);

CALL pro_user8(11);

CALL pro_user9(11);

CALL pro_user10(10);


DELETE FROM t_user;