MyDAL - .Where() & .And() & .Or() 使用
阿新 • • 發佈:2018-11-19
索引:
一.API 列表
1.Where
.Where(Func<M, bool> func) 如: .Where( it => (it.Prop1>=條件1 && it.Prop2<=條件2) || it.Prop3==條件3 ) 此類寫法,用在 Deleter/Updater/Selecter 中.
.Where(Func<bool>) 如: .Where( () => m1.PropX==條件1 || m2.PropY>條件2 && m3.PropZ<條件3 ) 此類寫法,用在 Joiner 中.
2.And
.And(Func<M, bool> func) 同 .Where(Func<M, bool> func) .
.And(Func<bool>) 同 .Where(Func<bool>) .
3.Or
.Or(Func<M, bool> func) 同 .Where(Func<M, bool> func) .
.Or(Func<bool>) 同 .Where(Func<bool>) .
注:
and 或 or 如: ...Where(xxx).And(yyy).Or(mmm).And(zzz)..... .
二.使用 Demo
1.刪除資料
1 var path = "~00-c-1-2-1-1-1-1-1-4-1-1-1-4-1-2-1-7"; 2 var level = 2; 3 // where and4 var res3 = await Conn 5 .Deleter<Agent>() 6 .Where(it => it.PathId == path) 7 .And(it => it.AgentLevel == (AgentLevel)level) 8 .DeleteAsync();
生成的 SQL 如下
1 delete 2 from `Agent` 3 where `PathId`=@PathId__1 4 and `AgentLevel`=@AgentLevel__2 ;
2.更新資料
1 var res8 = await Conn 2 .Updater<Agent>() 3 .Set(it => it.AgentLevel, AgentLevel.NewCustomer) 4 .Where(it => it.Id == Guid.Parse("0014f62d-2a96-4b5b-b4bd-01654438e3d4")) 5 .UpdateAsync();
生成 SQL 如下
1 update `Agent` 2 set `AgentLevel`=@AgentLevel__1 3 where `Id`=@Id__2 ;
3.單表查詢資料
1 var guid4 = Guid.Parse("000cecd5-56dc-4085-804b-0165443bdf5d"); 2 var pathId4 = "~00-d-3-2-1-c-2-f-4-3-1-2-4"; 3 var level4 = AgentLevel.Customer; 4 var res4 = await Conn 5 .Selecter<Agent>() 6 .Where(it => it.Id == guid4 && it.AgentLevel==level4 && it.PathId == pathId4) 7 .ListAsync();
生成 SQL 如下
1 select * 2 from `Agent` 3 where (( `Id`=@Id__3 && `AgentLevel`=@AgentLevel__4 ) && `PathId`=@PathId__5 ) 4 order by `CreatedOn` desc ;
4.連線查詢資料
1 var res6 = await Conn 2 .Joiner<Agent, AgentInventoryRecord>(out var agent6, out var record6) 3 .From(() => agent6) 4 .InnerJoin(() => record6) 5 .On(() => agent6.Id == record6.AgentId) 6 .Where(() => agent6.Id == guid6) 7 .FirstOrDefaultAsync<Agent>();
生成的 SQL 如下
1 select agent6.`*` 2 from `Agent` as agent6 3 inner join AgentInventoryRecord as record6 4 on agent6.`Id`=record6.`AgentId` 5 where agent6.`Id`=@Id__4 6 order by agent6.`CreatedOn` desc ;
蒙
2018-11-18 16:32 週日