MySQL PLSQL Demo - 004.模拟动态游标

参考：写MySQL存储过程实现动态执行SQL，也可以用临时表代替视图。

drop procedure if exists p_simulate_dynamic_cursor;

create procedure p_simulate_dynamic_cursor()
begin
    declare v_sql varchar(4000);
        declare v_field varchar(4000);
        declare v_result varchar(4000) default ‘‘;
        declare cur_temp cursor for select v.* from view_temp_20150701 v;
        declare continue handler for not found set v_field = null;

        set v_sql = ‘create view view_temp_20150701 as select t.id from t_user t‘;

        set @v_sql = v_sql;
        prepare statement from @v_sql;
        execute statement;
        deallocate prepare statement;

        open cur_temp;
        fetch cur_temp into v_field;
        while (v_field is not null) do
                set v_result = concat(v_result, v_field, ‘,‘);
                fetch cur_temp into v_field;
        end while;
        close cur_temp;
        select v_result;

        drop view if exists view_temp_20150701;
end;

call p_simulate_dynamic_cursor();