【前言】
接上一篇《【原创】打造基于Dapper的数据访问层》，Dapper在应付多表自由关联、分组查询、匿名查询等应用场景时不免显得吃力，经常要手写SQL语句（或者用工具生成SQL配置文件）。试想一下，项目中整个DAL层都塞满了SQL语句，对于后期维护来说无异于天灾人祸，这个坑谁踩谁知道。本框架在API设计上最大程度地借鉴 EntityFramework 的写法，干净的实体，丝滑的增删改查，稳健的导航属性，另外还支持链式查询（点标记）、查询表达式、聚合查询等等。在实体映射转换层面，使用 Emit 来动态构建绑定指令，性能最大限度地接近原生水平。
【XFramework 亮点】
- 原生.NET语法，零学习成本
- 支持LINQ查询、拉姆达表达式
- 支持批量增删改查和多表关联更新
- 支持 SqlServer、MySql、Postgre、Oracle，.NET Core
- 最大亮点，真正支持一对一、一对多导航属性。这一点相信现有开源的ORM没几个敢说它支持的
- 实体字段类型不必与数据库的类型一致
- 支持临时表、表变量操作
- 提供原生ADO操作
- 其它更多亮点，用了你就会知道
【性能】
看看与EntityFramework的性能对比，机器配置不同跑出来的结果可能也不一样，仅供参考。需要特别说明的是EntityFramework是用了AsNoTracking的，不然有缓存的话就没有比较的意义了。
扯个题外话，有些ORM说比EntityFramework快百分多少多少，看起来挺美实际上在我看来那是在扯淡，没有任何参考价值。限制实体字段类型必须与数据库的一致不说，甚至连导航属性这种最基本的功能都不支持，这不在同一个等级同一个体量上的东西非要扯在一起比谁快，确定要这么幽默吗？本人非常推崇开源，也很尊重致力于开源的同行，但是像这种行为就非常有必要出来打假一波了。
【功能说明】
1. 实体定义
1.1. 如果类有 TableAttribute，则用 TableAttribute 指定的名称做为表名，否则用类名称做为表名
1.2. 实体的字段可以指定 ColumnAttribute 特性来说明实体字段与表字段的对应关系，删除/更新时如果传递的参数是一个实体，必须使用 [Column(IsKey = true)] 指定实体的主键
1.3. ForeignKeyAttribute 指定外键，一对多外键时类型必须是 IList<T> 或者 List<T>
1.4 ColumnAttribute.DataType 用来指定表字段类型。以SQLSERVER为例，System.String 默认对应 nvarchar 类型。若是varchar类型，需要指定[Column(DbType= DbType.AnsiString)]
1 [Table(Name = "Bas_Client")]
2 public partial class Client
3 {
4 /// <summary>
5 /// 初始化 <see cref="Client"/> 类的新实例
6 /// </summary>
7 public Client()
8 {
9 this.CloudServerId = 0;
10 this.Qty = 0;
11 this.HookConstructor();
12 }
13
14 /// <summary>
15 /// 初始化 <see cref="Client"/> 类的新实例
16 /// </summary>
17 public Client(Client model)
18 {
19 this.CloudServerId = 0;
20 this.Qty = 0;
21 this.HookConstructor();
22 }
23
24 /// <summary>
25 /// clientid
26 /// </summary>
27 [Column(IsKey = true)]
28 public virtual int ClientId { get; set; }
29
30 /// <summary>
31 /// clientcode
32 /// </summary>
33 public virtual string ClientCode { get; set; }
34
35 /// <summary>
36 /// clientname
37 /// </summary>
38 public virtual string ClientName { get; set; }
39
40 /// <summary>
41 /// cloudserverid
42 /// </summary>
43 [Column(Default = 0)]
44 public virtual int CloudServerId { get; set; }
45
46 /// <summary>
47 /// activedate
48 /// </summary>
49 public virtual Nullable<DateTime> ActiveDate { get; set; }
50
51 /// <summary>
52 /// qty
53 /// </summary>
54 [Column(Default = 0)]
55 public virtual int Qty { get; set; }
56
57 /// <summary>
58 /// state
59 /// </summary>
60 public virtual byte State { get; set; }
61
62 /// <summary>
63 /// remark
64 /// </summary>
65 [Column(Default = "'默认值'")]
66 public virtual string Remark { get; set; }
67
68 [ForeignKey("CloudServerId")]
69 public virtual CloudServer CloudServer { get; set; }
70
71 [ForeignKey("CloudServerId")]
72 public virtual CloudServer LocalServer { get; set; }
73
74 [ForeignKey("ClientId")]
75 public virtual List<ClientAccount> Accounts { get; set; }
76
77 /// <summary>
78 /// 构造函数勾子
79 /// </summary>
80 partial void HookConstructor();
81 }2. 上下文定义
1 SQLSERVER：var context = new SqlDbContext(connString);
2 MySQL：var context = new MyMySqlDbContext(connString);
3 Postgre：var context = new NpgDbContext(connString);
4 Oracle：var context = new OracleDbContext(connString);3. 匿名类型
1 //// 匿名类
2 var guid = Guid.NewGuid();
3 var dynamicQuery =
4 from a in context.GetTable<TDemo>()
5 where a.DemoId <= 10
6 select new
7 {
8 DemoId = 12,
9 DemoCode = a.DemoCode,
10 DemoName = a.DemoName,
11 DemoDateTime_Nullable = a.DemoDateTime_Nullable,
12 DemoDate = sDate,
13 DemoDateTime = sDate,
14 DemoDateTime2 = sDate_null,
15 DemoGuid = guid,
16 DemoEnum = Model.State.Complete, // 枚举类型支持
17 DemoEnum2 = Model.State.Executing,
18 };
19 var result0 = dynamicQuery.ToList();
20
21 // 点标记
22 dynamicQuery = context
23 .GetTable<TDemo>()
24 .Where(a => a.DemoId <= 10)
25 .Select(a => new
26 {
27 DemoId = 13,
28 DemoCode = a.DemoCode,
29 DemoName = a.DemoName,
30 DemoDateTime_Nullable = a.DemoDateTime_Nullable,
31 DemoDate = sDate,
32 DemoDateTime = sDate,
33 DemoDateTime2 = sDate_null,
34 DemoGuid = Guid.NewGuid(),
35 DemoEnum = Model.State.Complete,
36 DemoEnum2 = Model.State.Executing
37 });
38 result0 = dynamicQuery.ToList();4. 所有字段
1 // Date,DateTime,DateTime2 支持
2 var query =
3 from a in context.GetTable<TDemo>()
4 where a.DemoId <= 10 && a.DemoDate > sDate && a.DemoDateTime >= sDate && a.DemoDateTime2 > sDate
5 select a;
6 var result1 = query.ToList();
7 // 点标记
8 query = context
9 .GetTable<TDemo>()
10 .Where(a => a.DemoId <= 10 && a.DemoDate > sDate && a.DemoDateTime >= sDate && a.DemoDateTime2 > sDate);
11 result1 = query.ToList();5. 指定字段
1 // 指定字段
2 query = from a in context.GetTable<TDemo>()
3 where a.DemoId <= 10
4 select new TDemo
5 {
6 DemoId = (int)a.DemoId,
7 DemoCode = (a.DemoCode ?? "N001"),
8 DemoName = a.DemoId.ToString(),
9 DemoDateTime_Nullable = a.DemoDateTime_Nullable,
10 DemoDate = sDate,
11 DemoDateTime = sDate,
12 DemoDateTime2 = sDate
13 };
14 result1 = query.ToList();
15 // 点标记
16 query = context
17 .GetTable<TDemo>()
18 .Where(a => a.DemoCode != a.DemoId.ToString() && a.DemoName != a.DemoId.ToString() && a.DemoChar == 'A' && a.DemoNChar == 'B')
19 .Select(a => new TDemo
20 {
21 DemoId = a.DemoId,
22 DemoCode = a.DemoName == "张三" ? "李四" : "王五",
23 DemoName = a.DemoCode == "张三" ? "李四" : "王五",
24 DemoChar = 'A',
25 DemoNChar = 'B',
26 DemoDateTime_Nullable = a.DemoDateTime_Nullable,
27 DemoDate = sDate,
28 DemoDateTime = sDate,
29 DemoDateTime2 = sDate
30 });
31 result1 = query.ToList();6.构造函数
用过 EntityFramework 的同学都知道，如果要通过构造函数的方式查询指定字段，除非老老实实重新定义一个新的实体，否则一个 “The entity or complex type cannot be constructed in a LINQ to Entities query“ 的异常马上给甩你脸上。XFramework 框架的这个用法，就是为了让你远离这会呼吸的痛！~
1 // 构造函数
2 var query =
3 from a in context.GetTable<Model.Demo>()
4 where a.DemoId <= 10
5 select new Model.Demo(a);
6 var r1 = query.ToList();
7 //SQL=>
8 //SELECT
9 //t0.[DemoId] AS [DemoId],
10 //t0.[DemoCode] AS [DemoCode],
11 //t0.[DemoName] AS [DemoName],
12 //...
13 //FROM [Sys_Demo] t0
14 //WHERE t0.[DemoId] <= 10
15 query =
16 from a in context.GetTable<Model.Demo>()
17 where a.DemoId <= 10
18 select new Model.Demo(a.DemoId, a.DemoName);
19 r1 = query.ToList();7. 分页查询
1 // 分页查询
2 // 1.不是查询第一页的内容时，必须先OrderBy再分页，OFFSET ... Fetch Next 分页语句要求有 OrderBy
3 // 2.OrderBy表达式里边的参数必须跟query里边的变量名一致，如此例里的 a。SQL解析时根据此变更生成表别名
4 query = from a in context.GetTable<TDemo>()
5 orderby a.DemoCode
6 select a;
7 query = query.Skip(1).Take(18);
8 result1 = query.ToList();
9 // 点标记
10 query = context
11 .GetTable<TDemo>()
12 .OrderBy(a => a.DemoCode)
13 .Skip(1)
14 .Take(18);
15 result1 = query.ToList();8. 过滤条件
1 // 过滤条件
2 query = from a in context.GetTable<TDemo>()
3 where a.DemoName == "D0000002" || a.DemoCode == "D0000002"
4 select a;
5 result1 = query.ToList();
6 // 点标记
7 query = context.GetTable<TDemo>().Where(a => a.DemoName == "D0000002" || a.DemoCode == "D0000002");
8 result1 = query.ToList();
9 query = context.GetTable<TDemo>().Where(a => a.DemoName.Contains("004"));
10 result1 = query.ToList();
11 query = context.GetTable<TDemo>().Where(a => a.DemoCode.StartsWith("Code000036"));
12 result1 = query.ToList();
13 query = context.GetTable<TDemo>().Where(a => a.DemoCode.EndsWith("004"));
14 result1 = query.ToList();9. 更多条件
1 // 支持的查询条件
2 // 区分 nvarchar,varchar,date,datetime,datetime2 字段类型
3 // 支持的字符串操作=> Trim | TrimStart | TrimEnd | ToString | Length
4 int m_byte = 9;
5 Model.State state = Model.State.Complete;
6 query = from a in context.GetTable<TDemo>()
7 where
8 a.DemoCode == "002" &&
9 a.DemoName == "002" &&
10 a.DemoCode.Contains("TAN") && // LIKE '%%'
11 a.DemoName.Contains("TAN") && // LIKE '%%'
12 a.DemoCode.StartsWith("TAN") && // LIKE 'K%'
13 a.DemoCode.EndsWith("TAN") && // LIKE '%K'
14 a.DemoCode.Length == 12 && // LENGTH
15 a.DemoCode.TrimStart() == "TF" &&
16 a.DemoCode.TrimEnd() == "TF" &&
17 a.DemoCode.TrimEnd() == "TF" &&
18 a.DemoCode.Substring(0) == "TF" &&
19 a.DemoDate == DateTime.Now &&
20 a.DemoDateTime == DateTime.Now &&
21 a.DemoDateTime2 == DateTime.Now &&
22 a.DemoName == (
23 a.DemoDateTime_Nullable == null ? "NULL" : "NOT NULL") && // 三元表达式
24 a.DemoName == (a.DemoName ?? a.DemoCode) && // 二元表达式
25 new[] { 1, 2, 3 }.Contains(a.DemoId) && // IN(1,2,3)
26 new List<int> { 1, 2, 3 }.Contains(a.DemoId) && // IN(1,2,3)
27 new List<int>(_demoIdList).Contains(a.DemoId) && // IN(1,2,3)
28 a.DemoId == new List<int> { 1, 2, 3 }[0] && // IN(1,2,3)
29 _demoIdList.Contains(a.DemoId) && // IN(1,2,3)
30 a.DemoName == _demoName &&
31 a.DemoCode == (a.DemoCode ?? "CODE") &&
32 new List<string> { "A", "B", "C" }.Contains(a.DemoCode) &&
33 a.DemoByte == (byte)m_byte &&
34 a.DemoByte == (byte)Model.State.Complete ||
35 a.DemoInt == (int)Model.State.Complete ||
36 a.DemoInt == (int)state ||
37 (a.DemoName == "STATE" && a.DemoName == "REMARK")// OR 查询
38 select a;
39 result1 = query.ToList();10. DataTable和DataSet
1 // DataTable
2 query = from a in context.GetTable<TDemo>()
3 orderby a.DemoCode
4 select a;
5 query = query.Take(18);
6 var result3 = context.Database.ExecuteDataTable(query);
7
8 // DataSet
9 var define = query.Resolve();
10 List<DbCommandDefinition> sqlList = new List<DbCommandDefinition> { define, define, define };
11 var result4 = context.Database.ExecuteDataSet(sqlList);11. 内联查询
1 // INNER JOIN
2 var query =
3 from a in context.GetTable<Model.Client>()
4 join b in context.GetTable<Model.CloudServer>() on a.CloudServerId equals b.CloudServerId
5 where a.ClientId > 0
6 select a;
7 var result = query.ToList();
8 // 点标记
9 query = context
10 .GetTable<Model.Client>()
11 .Join(context.GetTable<Model.CloudServer>(), a => a.CloudServerId, b => b.CloudServerId, (a, b) => a)
12 .Where(a => a.ClientId > 0);
13 result = query.ToList();12. 左联查询
注意看第二个左关联，使用常量作为关联键，翻译出来的SQL语句大概是这样的：
SELECT ***
FROM [Bas_Client] t0
LEFT JOIN [Sys_CloudServer] t1 ON t0.[CloudServerId] = t1.[CloudServerId] AND N'567' = t1.[CloudServerCode]
WHERE t1.[CloudServerName] IS NOT NULL
有没有看到熟悉的味道，兄dei？
1 // LEFT JOIN
2 query =
3 from a in context.GetTable<Model.Client>()
4 join b in context.GetTable<Model.CloudServer>() on a.CloudServerId equals b.CloudServerId into u_b
5 from b in u_b.DefaultIfEmpty()
6 select a;
7 query = query.Where(a => a.CloudServer.CloudServerName != null);
8 result = query.ToList();
9
10 // LEFT JOIN
11 query =
12 from a in context.GetTable<Model.Client>()
13 join b in context.GetTable<Model.CloudServer>() on new { a.CloudServerId, CloudServerCode = "567" } equals new { b.CloudServerId, b.CloudServerCode } into u_b
14 from b in u_b.DefaultIfEmpty()
15 select a;
16 query = query.Where(a => a.CloudServer.CloudServerName != null);
17 result = query.ToList();13. 右联查询
左关联和右关联的语法我这里用的是一样的，不过是 DefaultIfEmpty 方法加多了一个重载，DefaultIfEmpty(true) 即表示右关联。
1 // RIGHT JOIN
2 query =
3 from a in context.GetTable<Model.CloudServer>()
4 join b in context.GetTable<Model.Client>() on a.CloudServerId equals b.CloudServerId into u_b
5 from b in u_b.DefaultIfEmpty(true)
6 where a.CloudServerName == null
7 select b;
8 result = query.ToList();14. Union查询
我们的Union查询支持 UNION 操作后再分页哦~
1 // UNION 注意UNION分页的写法，仅支持写在最后
2 var q1 = context.GetTable<Model.Client>().Where(x => x.ClientId == 0);
3 var q2 = context.GetTable<Model.Client>().Where(x => x.ClientId == 0);
4 var q3 = context.GetTable<Model.Client>().Where(x => x.ClientId == 0);
5 var query6 = q1.Union(q2).Union(q3);
6 var result6 = query6.ToList();
7 result6 = query6.Take(2).ToList();
8 result6 = query6.OrderBy(a => a.ClientId).Skip(2).ToList();
9 query6 = query6.Take(2);
10 result6 = query6.ToList();
11 query6 = query6.OrderBy(a => a.ClientId).Skip(1).Take(2);
12 result6 = query6.ToList();15. 导航属性
1 // 更简单的赋值方式
2 // 适用场景：在显示列表时只想显示外键表的一两个字段
3 query =
4 from a in context.GetTable<Model.Client>()
5 select new Model.Client(a)
6 {
7 CloudServer = a.CloudServer,
8 LocalServer = new Model.CloudServer
9 {
10 CloudServerId = a.CloudServerId,
11 CloudServerName = a.LocalServer.CloudServerName
12 }
13 };
14 result = query.ToList();16. 一对一一对多导航
1 // 1：1关系，1：n关系
2 query =
3 from a in context.GetTable<Model.Client>()
4 where a.ClientId > 0
5 orderby a.ClientId
6 select new Model.Client(a)
7 {
8 CloudServer = a.CloudServer,
9 Accounts = a.Accounts
10 };
11 result = query.ToList();17. Include 语法
EntityFramework 有Include语法，咱也有，而且是实打实的一次性加载！！！
1 // Include 语法
2 query =
3 context
4 .GetTable<Model.Client>()
5 .Include(a => a.CloudServer);
6 --query =
7 -- from a in query
8 -- join b in context.GetTable<Model.CloudServer>() on a.CloudServerId equals b.CloudServerId
9 -- orderby a.ClientId
10 -- select new Model.Client(a)
11 -- {
12 -- CloudServer = a.CloudServer
13 -- };
14 result = query.ToList();
15
16 // 还是Include，无限主从孙 ###
17 query =
18 from a in context
19 .GetTable<Model.Client>()
20 .Include(a => a.Accounts)
21 .Include(a => a.Accounts[0].Markets)
22 .Include(a => a.Accounts[0].Markets[0].Client)
23 where a.ClientId > 0
24 orderby a.ClientId
25 select a;
26 result = query.ToList();
27
28 // Include 分页
29 query =
30 from a in context
31 .GetTable<Model.Client>()
32 .Include(a => a.Accounts)
33 .Include(a => a.Accounts[0].Markets)
34 .Include(a => a.Accounts[0].Markets[0].Client)
35 where a.ClientId > 0
36 orderby a.ClientId
37 select a;
38 query = query
39 .Where(a => a.ClientId > 0 && a.CloudServer.CloudServerId > 0)
40 .Skip(10)
41 .Take(20);
42 result = query.ToList();
43 query =
44 from a in context
45 .GetTable<Model.Client>()
46 .Include(a => a.CloudServer)
47 .Include(a => a.Accounts)
48 where a.ClientId > 0
49 select a;
50 query = query.OrderBy(a => a.ClientId);
51 result = query.ToList();
52
53 // Include 语法查询 主 从 孙 关系<注：相同的导航属性不能同时用include和join>
54 var query1 =
55 from a in
56 context
57 .GetTable<Model.Client>()
58 .Include(a => a.CloudServer)
59 .Include(a => a.Accounts)
60 .Include(a => a.Accounts[0].Markets)
61 .Include(a => a.Accounts[0].Markets[0].Client)
62 group a by new { a.ClientId, a.ClientCode, a.ClientName, a.CloudServer.CloudServerId } into g
63 select new Model.Client
64 {
65 ClientId = g.Key.ClientId,
66 ClientCode = g.Key.ClientCode,
67 ClientName = g.Key.ClientName,
68 CloudServerId = g.Key.CloudServerId,
69 Qty = g.Sum(a => a.Qty)
70 };
71 query1 = query1
72 .Where(a => a.ClientId > 0)
73 .OrderBy(a => a.ClientId)
74 .Skip(10)
75 .Take(20)
76 ;
77 var result1 = query1.ToList();18. 分组查询
1 var query2 =
2 from a in context.GetTable<Model.Client>()
3 group a by a.ClientId into g
4 select new
5 {
6 ClientId = g.Key,
7 Qty = g.Sum(a => a.Qty)
8 };
9 query2 = query2.OrderBy(a => a.ClientId).ThenBy(a => a.Qty);19. 聚合函数
1 var result1 = query2.Max(a => a.ClientId);
2 var result2 = query2.Sum(a => a.Qty);
3 var result3 = query2.Min(a => a.ClientId);
4 var result4= query2.Average(a => a.Qty);
5 var result5 = query2.Count();20. 分组分页
1 // 分组后再分页
2 var query8 =
3 from a in context.GetTable<Model.Client>()
4 where a.ClientName == "TAN"
5 group a by new { a.ClientId, a.ClientName } into g
6 where g.Key.ClientId > 0
7 orderby new { g.Key.ClientName, g.Key.ClientId }
8 select new
9 {
10 Id = g.Key.ClientId,
11 Name = g.Min(a => a.ClientId)
12 };
13 query8 = query8.Skip(2).Take(3);
14 var result8 = query8.ToList();21. 子查询
1 // 强制转为子查询
2 query =
3 from a in context.GetTable<Model.Client>()
4 join b in context.GetTable<Model.CloudServer>() on a.CloudServerId equals b.CloudServerId into u_c
5 from b in u_c.DefaultIfEmpty()
6 select a;
7 query = query.OrderBy(a => a.ClientId).Skip(10).Take(10).AsSubQuery();
8 query = from a in query
9 join b in context.GetTable<Model.Client>() on a.ClientId equals b.ClientId
10 select a;
11 result = query.ToList();22. Any 查询
1 // Any
2 var isAny = context.GetTable<Model.Client>().Any();
3 isAny = context.GetTable<Model.Client>().Any(a => a.ActiveDate == DateTime.Now);
4 isAny = context.GetTable<Model.Client>().Distinct().Any(a => a.ActiveDate == DateTime.Now);
5 isAny = context.GetTable<Model.Client>().OrderBy(a => a.ClientId).Skip(2).Take(5).Any(a => a.ActiveDate == DateTime.Now);
6 //SQL=>
7 //IF EXISTS(
8 // SELECT TOP 1 1
9 // FROM[Bas_Client] t0
10 // WHERE t0.[ActiveDate] = '2018-08-15 14:07:09.784'
11 //) SELECT 1 ELSE SELECT 023. 单个删除
1 // 1. 删除单个记录
2 var demo = new TDemo { DemoId = 1 };
3 context.Delete(demo);
4 context.SubmitChanges();24. 批量删除
1 // 2.WHERE 条件批量删除
2 context.Delete<TDemo>(a => a.DemoId == 2 || a.DemoId == 3 || a.DemoName == "N0000004");
3 var qeury =
4 context
5 .GetTable<TDemo>()
6 .Where(a => a.DemoId == 2 || a.DemoId == 3 || a.DemoName == "N0000004");
7 // 2.WHERE 条件批量删除
8 context.Delete<TDemo>(qeury);
9 context.SubmitChanges();25. 多表关联删除
1 // 3.Query 关联批量删除
2 var query1 =
3 from a in context.GetTable<Model.Client>()
4 join b in context.GetTable<Model.ClientAccount>() on a.ClientId equals b.ClientId
5 join c in context.GetTable<Model.ClientAccountMarket>() on new { b.ClientId, b.AccountId } equals new { c.ClientId, c.AccountId }
6 where c.ClientId == 5 && c.AccountId == "1" && c.MarketId == 1
7 select a;
8 context.Delete<Model.Client>(query1);
9
10 // oracle 不支持导航属性关联删除
11 // 3.Query 关联批量删除
12 var query2 =
13 from a in context.GetTable<Model.Client>()
14 join b in context.GetTable<Model.ClientAccount>() on a.ClientId equals b.ClientId
15 where a.CloudServer.CloudServerId == 20 && a.LocalServer.CloudServerId == 2
16 select a;
17 context.Delete<Model.Client>(query2);
18 // 4.Query 关联批量删除
19 var query3 =
20 from a in context.GetTable<Model.Client>()
21 where a.CloudServer.CloudServerId == 20 && a.LocalServer.CloudServerId == 2
22 select a;
23 context.Delete<Model.Client>(query3);
24
25
26 // 5.子查询批量删除
27 // 子查询更新
28 var sum =
29 from a in context.GetTable<Model.ClientAccount>()
30 where a.ClientId <= 20
31 group a by new { a.ClientId } into g
32 select new Model.Client
33 {
34 ClientId = g.Key.ClientId,
35 Qty = g.Sum(a => a.Qty)
36 };
37 var query4 =
38 from a in context.GetTable<Model.Client>()
39 join b in context.GetTable<Model.CloudServer>() on a.CloudServerId equals b.CloudServerId
40 join c in context.GetTable<Model.CloudServer>() on a.CloudServerId equals c.CloudServerId
41 join d in sum on a.ClientId equals d.ClientId
42 where a.ClientId > 10 && a.CloudServerId < 0
43 select a;
44 context.Delete<Model.Client>(query4);26. 单个更新
1 var demo = context
2 .GetTable<TDemo>()
3 .FirstOrDefault(x => x.DemoId > 0);
4
5 // 整个实体更新
6 demo.DemoName = "001'.N";
7 context.Update(demo);
8 context.SubmitChanges();27.批量更新
1 // 2.WHERE 条件批量更新
2 context.Update<TDemo>(x => new TDemo
3 {
4 DemoDateTime2 = DateTime.UtcNow,
5 DemoDateTime2_Nullable = null,
6 //DemoTime_Nullable = ts
7 }, x => x.DemoName == "001'.N" || x.DemoCode == "001'.N");
8 context.SubmitChanges();28. 多表关联更新
这里还支持将B表字段的值更新回A表，有多方便你自己体会。事先声明，Oracle和Postgre是不支持这种sao操作的。
1 // 3.Query 关联批量更新
2 var query =
3 from a in context.GetTable<Model.Client>()
4 where a.CloudServer.CloudServerId != 0
5 select a;
6 context.Update<Model.Client>(a => new Model.Client
7 {
8 Remark = "001.TAN"
9 }, query);
10
11 // 更新本表值等于从表的字段值
12 query =
13 from a in context.GetTable<Model.Client>()
14 join b in context.GetTable<Model.CloudServer>() on a.CloudServerId equals b.CloudServerId
15 join c in context.GetTable<Model.ClientAccount>() on a.ClientId equals c.ClientId
16 where c.AccountId == "12"
17 select a;
18 context.Update<Model.Client, Model.CloudServer>((a, b) => new Model.Client
19 {
20 CloudServerId = b.CloudServerId,
21 Remark = "001.TAN"
22 }, query);
23 context.SubmitChanges();29. 子查询更新
1 // 子查询更新
2 var sum =
3 from a in context.GetTable<Model.ClientAccount>()
4 where a.ClientId > 0
5 group a by new { a.ClientId } into g
6 select new Model.Client
7 {
8 ClientId = g.Key.ClientId,
9 Qty = g.Sum(a => a.Qty)
10 };
11 if (_databaseType == DatabaseType.SqlServer || _databaseType == DatabaseType.MySql)
12 {
13 var uQuery =
14 from a in context.GetTable<Model.Client>()
15 join b in sum on a.ClientId equals b.ClientId
16 where a.ClientId > 0 && b.ClientId > 0
17 select a;
18 context.Update<Model.Client, Model.Client>((a, b) => new Model.Client { Qty = b.Qty }, uQuery);
19 }
20 else
21 {
22 // npg oracle 翻译成 EXISTS,更新字段的值不支持来自子查询
23 var uQuery =
24 from a in context.GetTable<Model.Client>()
25 join b in sum on a.ClientId equals b.ClientId
26 where a.ClientId > 0 // b.ClientId > 0
27 select a;
28 context.Update<Model.Client>(a => new Model.Client { Qty = 9 }, uQuery);
29 }
30 context.SubmitChanges();30. 带自增列新增
1 // 带自增列
2 var demo = new TDemo
3 {
4 DemoCode = "D0000001",
5 DemoName = "N0000001",
6 DemoBoolean = true,
7 DemoChar = 'A',
8 DemoNChar = 'B',
9 DemoByte = 64,
10 DemoDate = DateTime.Now,
11 DemoDateTime = DateTime.Now,
12 DemoDateTime2 = DateTime.Now,
13 DemoDecimal = 64,
14 DemoDouble = 64,
15 DemoFloat = 64,
16 DemoGuid = Guid.NewGuid(),
17 DemoShort = 64,
18 DemoInt = 64,
19 DemoLong = 64
20 };
21 context.Insert(demo);
22 context.SubmitChanges();
23
24 var demo2 = new TDemo
25 {
26 DemoCode = "D0000002",
27 DemoName = "N0000002",
28 DemoBoolean = true,
29 DemoChar = 'A',
30 DemoNChar = 'B',
31 DemoByte = 65,
32 DemoDate = DateTime.Now,
33 DemoDateTime = DateTime.Now,
34 DemoDateTime2 = DateTime.Now,
35 DemoDecimal = 65,
36 DemoDouble = 65,
37 DemoFloat = 65,
38 DemoGuid = Guid.NewGuid(),
39 DemoShort = 65,
40 DemoInt = 65,
41 DemoLong = 65
42 };
43 context.Insert(demo2);
44
45 var demo3 = new TDemo
46 {
47 DemoCode = "D0000003",
48 DemoName = "N0000003",
49 DemoBoolean = true,
50 DemoChar = 'A',
51 DemoNChar = 'B',
52 DemoByte = 66,
53 DemoDate = DateTime.Now,
54 DemoDateTime = DateTime.Now,
55 DemoDateTime2 = DateTime.Now,
56 DemoDecimal = 66,
57 DemoDouble = 66,
58 DemoFloat = 66,
59 DemoGuid = Guid.NewGuid(),
60 DemoShort = 66,
61 DemoInt = 66,
62 DemoLong = 66
63 };
64 context.Insert(demo3);
65 context.Insert(demo);
66 context.SubmitChanges();31. 批量新增
批量新增翻译的SQL不带参数，只是纯SQL文本。SQLSERVER的同学如果想更快，可以尝尝 SqlDbContext.BulkCopy方法。
1 // 批量增加
2 // 产生 INSERT INTO VALUES(),(),()... 语法。注意这种批量增加的方法并不能给自增列自动赋值
3 context.Delete<TDemo>(x => x.DemoId > 1000000);
4 demos = new List<TDemo>();
5 for (int i = 0; i < 1002; i++)
6 {
7 TDemo d = new TDemo
8 {
9 DemoCode = "D0000001",
10 DemoName = "N0000001",
11 DemoBoolean = true,
12 DemoChar = 'A',
13 DemoNChar = 'B',
14 DemoByte = 64,
15 DemoDate = DateTime.Now,
16 DemoDateTime = DateTime.Now,
17 DemoDateTime2 = DateTime.Now,
18 DemoDecimal = 64,
19 DemoDouble = 64,
20 DemoFloat = 64,
21 DemoGuid = Guid.NewGuid(),
22 DemoShort = 64,
23 DemoInt = 64,
24 DemoLong = 64
25 };
26 demos.Add(d);
27 }
28 context.Insert<TDemo>(demos);
29 context.SubmitChanges();32. 关联查询新增
1 // 子查询增
2 var sum =
3 from a in context.GetTable<Model.ClientAccount>()
4 where a.ClientId > 0
5 group a by new { a.ClientId } into g
6 select new Model.Client
7 {
8 ClientId = g.Key.ClientId,
9 Qty = g.Sum(a => a.Qty)
10 };
11 sum = sum.AsSubQuery();
12
13 maxId = context.GetTable<Model.Client>().Max(x => x.ClientId);
14 nextId = maxId + 1;
15 var nQuery =
16 from a in sum
17 join b in context.GetTable<Model.Client>() on a.ClientId equals b.ClientId into u_b
18 from b in u_b.DefaultIfEmpty()
19 where b.ClientId == null
20 select new Model.Client
21 {
22 ClientId = SqlMethod.RowNumber<int>(x => a.ClientId) + nextId,
23 ClientCode = "ABC3",
24 ClientName = "啊啵呲3",
25 CloudServerId = 11,
26 State = 3,
27 Qty = a.Qty,
28 };
29 context.Insert(nQuery);33. 增删改同时查出数据
1 context.Update<Model.Client>(x => new Model.Client
2 {
3 ClientName = "蒙3"
4 }, x => x.ClientId == 3);
5 var query =
6 from a in context.GetTable<Model.Client>()
7 where a.ClientId == 1
8 select 5;
9 context.AddQuery(query);
10 List<int> result1 = null;
11 context.SubmitChanges(out result1);
12
13 context.Update<Model.Client>(x => new Model.Client
14 {
15 ClientName = "蒙4"
16 }, x => x.ClientId == 4);
17 query =
18 from a in context.GetTable<Model.Client>()
19 where a.ClientId == 1
20 select 5;
21 context.AddQuery(query);
22 var query2 =
23 from a in context.GetTable<Model.Client>()
24 where a.ClientId == 1
25 select 6;
26 context.AddQuery(query2);
27 result1 = null;
28 List<int> result2 = null;
29 context.SubmitChanges(out result1, out result2);34. 一次性加载多个列表
1 // 一性加载多个列表 ****
2 var query3 =
3 from a in context.GetTable<Model.Client>()
4 where a.ClientId >= 1 && a.ClientId <= 10
5 select 5;
6 var query4 =
7 from a in context.GetTable<Model.Client>()
8 where a.ClientId >= 1 && a.ClientId <= 10
9 select 6;
10 var tuple = context.Database.ExecuteMultiple<int, int>(query3, query4);
11
12 query3 =
13 from a in context.GetTable<Model.Client>()
14 where a.ClientId >= 1 && a.ClientId <= 10
15 select 5;
16 query4 =
17 from a in context.GetTable<Model.Client>()
18 where a.ClientId >= 1 && a.ClientId <= 10
19 select 6;
20 var query5 =
21 from a in context.GetTable<Model.Client>()
22 where a.ClientId >= 1 && a.ClientId <= 10
23 select 7;
24 var tuple2 = context.Database.ExecuteMultiple<int, int, int>(query3, query4, query5);35. 事务操作
借鉴 EntityFramework的思想，本框架也支持自身开启事务，或者从其它上下文开启事务后再在本框架使用该事务。
// 事务1. 上下文独立事务
try
{
using (var transaction = context.Database.BeginTransaction())
{
var result = context.GetTable<Model.Client>().FirstOrDefault(x => x.ClientId <= 10);
context.Update<Model.Client>(x => new Model.Client
{
ClientName = "事务1"
}, x => x.ClientId == result.ClientId);
context.SubmitChanges();
result = context.GetTable<Model.Client>().FirstOrDefault(x => x.ClientId == result.ClientId);
context.Update<Model.Client>(x => new Model.Client
{
ClientName = "事务2"
}, x => x.ClientId == result.ClientId);
context.SubmitChanges();
result = context.GetTable<Model.Client>().FirstOrDefault(x => x.ClientId == result.ClientId);
//throw new Exception("假装异常");
//transaction.Rollback();
transaction.Commit();
}
}
finally
{
// 开启事务后必需显式释放资源
context.Dispose();
}
// 事务2. 使用其它的事务
IDbTransaction transaction2 = null;
IDbConnection connection = null;
try
{
connection = context.Database.DbProviderFactory.CreateConnection();
connection.ConnectionString = context.Database.ConnectionString;
if (connection.State != ConnectionState.Open) connection.Open();
transaction2 = connection.BeginTransaction();
// 指定事务
context.Database.Transaction = transaction2;
var result = context.GetTable<Model.Client>().FirstOrDefault(x => x.ClientId <= 10);
context.Update<Model.Client>(x => new Model.Client
{
ClientName = "事务3"
}, x => x.ClientId == result.ClientId);
context.SubmitChanges();
result = context.GetTable<Model.Client>().FirstOrDefault(x => x.ClientId == result.ClientId);
context.Update<Model.Client>(x => new Model.Client
{
ClientName = "事务4"
}, x => x.ClientId == result.ClientId);
result = context.GetTable<Model.Client>().FirstOrDefault(x => x.ClientId == result.ClientId);
string sql = @"UPDATE Bas_Client SET ClientName = N'事务5' WHERE ClientID=2;UPDATE Bas_Client SET ClientName = N'事务6' WHERE ClientID=3;";
context.AddQuery(sql);
context.SubmitChanges();
transaction2.Commit();
}
catch
{
if (transaction2 != null) transaction2.Rollback();
throw;
}
finally
{
if (transaction2 != null) transaction2.Dispose();
if (connection != null) connection.Close();
if (connection != null) connection.Dispose();
context.Dispose();
}36. 表变量
SQLSERVER的童鞋看过来，你要的爽本框架都能给~
1 // 声明表变量
2 var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo<SqlServerModel.JoinKey>();
3 context.AddQuery(string.Format("DECLARE {0} [{1}]", typeRuntime.TableName, typeRuntime.TableName.TrimStart('@')));
4 List<SqlServerModel.JoinKey> keys = new List<SqlServerModel.JoinKey>
5 {
6 new SqlServerModel.JoinKey{ Key1 = 2 },
7 new SqlServerModel.JoinKey{ Key1 = 3 },
8 };
9 // 向表变量写入数据
10 context.Insert<SqlServerModel.JoinKey>(keys);
11 // 像物理表一样操作表变量
12 var query =
13 from a in context.GetTable<Model.Client>()
14 join b in context.GetTable<SqlServerModel.JoinKey>() on a.ClientId equals b.Key1
15 select a;
16 context.AddQuery(query);
17 // 提交查询结果
18 List<Model.Client> result = null;
19 context.SubmitChanges(out result);【结语】
XFramework 已成熟运用于我们公司的多个核心项目，完全代替了之前的 Dapper + DbHelper的数据持久方案。从最初只支持SQLSERVER到支持MySQL、Postgre和Oracle，一个多月的熬夜坚持，个中酸爽只有经历过才能体会。你的喜爱和支持是我在开源的路上一路狂奔的最大动力，撸码不易，不喜请轻喷。但我相信，这绝对是一款人性化、有温度的数据持久框架！！！
XFramework 现已完全开源，遵循 Apache2.0 协议，托管地址：
码云：https://gitee.com/TANZAME/TZM.XFramework
GitHub：https://github.com/TANZAME/TZM.XFramework
ORM 技术交流群:816425449
原文出处：https://www.cnblogs.com/yiting/p/10952302.html
来源：oschina
链接：https://my.oschina.net/u/4290907/blog/3262581