mysql存储过程

drop procedure count_points;
create procedure count_points()
begin
    declare n_Latitude double;
    declare n_Longitude double;
    declare isExist int;
    declare countExist int default 0;
    declare n_cellname varchar(255);

    -- 定义游标遍历时，作为判读是否遍历完全被记录的标记
    declare num int default 0;
    declare lat_long_list CURSOR FOR select Longitude,Latitude,cellname from         
    table_name;

    -- 声明当游标遍历完全被记录后将标志变量置成某个值
    declare continue handler for sqlstate '02000' set num=1;
    truncate table t_cell_name;

    -- 打开游标
    open lat_long_list;

    -- 将游标中的值赋值给变量，要注意sql结果列的顺序
    fetch lat_long_list into n_Longitude,n_Latidute,n_cellname;

    -- 打印值
    -- select n_Longitude,n_Latitude;

    -- while循环
    while num<>1 do
    select  count(*) into isExist from tableb;
    if isExist = 1 then
        set countExist = countExist +1;
        insert into t_cell_name(cellname) values(n_cellname);
    end if;
    
    -- 循环变量下一条数据，将游标中的值赋值给变量，要注意sql结果列的顺序
    fetch lat_long_list into n_Longitude,n_Latitude,n_cellname;

    end while;

    --  关闭游标
    close lat_long_list;

    -- 打印值
    select countExist;
end