mysql 动态 sql

BEGIN /**** declare cnt int ; set @stmt = concat('select count(1) from player_item_00 into @v_cnt;'); PREPARE stmt1 FROM @stmt; EXECUTE stmt1; deallocate prepare stmt1; set cnt = @v_cnt ; select cnt; **/ declare str varchar(200) ; declare i int default 0; set @v_table_name = concat(' player_item_0',i); set @v_condition = concat(' where id = 1'); set @v_player_id = concat(' where player_id=' ,player_id); set @stmt = concat('select * from ',@v_table_name,@v_player_id); PREPARE stmt1 FROM @stmt; EXECUTE stmt1; END