MySQL儲存過程小記

首先來看兩張表：

drop

table
ifexists field_index

create

table field_index

(

schema_name  varchar(100) not

null,

field_name   varchar(100) not

null,

next_index   int

notnull,

constraint field_index_pk primary

key (schema_name,field_name)

);

insert into field_index values('web_user','user_id','1000');

select * from field_index;

drop

table
ifexists web_user

create

table web_user(

userid varchar(30)   not

null,

username varchar(30) not

null,

nickname varchar(30) not

null,

email varchar(50),

password varchar(30) not

null,

registtime timestamp(14) not

null
default now(),

statusid varchar(30) default

'1',

constraint webuser_pk primary

key (userid)

)

然後來看下儲存過程：

drop

procedure
ifexists getnextindex;

create

procedure getnextindex(in tablename varchar(100),in columnname varchar(100),out nextindex varchar(100))

begin

declare stopflag int;

declare cur_1 cursor

forselect next_index from field_index where schema_name = tablename and field_name = columnname ;

declare

continue handler for
notfound
set stopflag=1;

set nextindex = -1;

open cur_1;

repeat

fetch cur_1 into nextindex;

until stopflag = 1

end repeat ;

close cur_1;

if nextindex = -1 then

insert into field_index values(tablename,columnname,'10001');

set  nextindex = '10000';

else

update field_index set next_index = next_index + 1 where schema_name = tablename and field_name = columnname ;

end

if;

select nextindex;

end;

call getnextindex('web_user','user_id',@sss);

call getnextindex('web_user','user_id_ss',@sss);

儲存過程中我們也可以使用preparestmt的功能。

drop

procedure
ifexists getnextindex;

create

procedure getnextindex(in schema_name varchar(100),in field_name varchar(100))

begin

declare sqls varchar(100) ;

declare schemaname varchar(4000);

declare fieldname varchar(4000);

set schemaname = schema_name;

set fieldname = field_name;

set sqls = concat('select * from field_index' );

set sqls = concat(sqls,' where schema_name = ? and field_name = ? ');

set @ssql = sqls;

set @param1 = schemaname;

set @param2 = fieldname;

prepare stmt from @ssql;

execute stmt using @param1,@param2;

end;

call getnextindex('web_user','user_id');

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