sql在資料庫執行很快 放在程式碼中就相當慢
阿新 • • 發佈：2019-04-11
select d.*,c.name AS couponName from pe_a d
left join pe_b r on r.id = d.ruleId
left join pe_c c on d.coupon_id = c.id
where 1=1 and r.`enable` = 1 and r.delete_flag = 0
and r.expity_start < now() and r.expity_end > now()
and d.status = 1 and d.expity_start < '2019-04-11 20:36:58' and d.expity_end > '2019-04-11 20:36:58'
and ( 1=2 or d.allocate_phone_number = '15201733860' or d.allocate_user_id = '420832473243164672' )
order by d.expity_end limit 0,100
資料庫執行0.03秒，程式碼執行5秒
-------------------------原因-----------------------
builder.append(" or d.allocate_user_id = ?");
args.add(user.getId());
結果是這樣的：allocate_user_id 的型別引數是long,資料庫型別是string,所以型別不對，導致慢了
select d.*,c.name AS couponName from pe_a d
left join pe_b r on r.id = d.ruleId
left join pe_c c on d.coupon_id = c.id
where 1=1 and r.`enable` = 1 and r.delete_flag = 0
and r.expity_start < now() and r.expity_end > now()
and d.status = 1 and d.expity_start < '2019-04-11 20:36:58' and d.expity_end > '2019-04-11 20:36:58'
and ( 1=2 or d.allocate_phone_number = '15201733860' or d.allocate_user_id = 420832473243164672')
order by d.expity_end limit 0,100