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项目作者： shuxinqin

项目描述 ：
用于.NET的轻量级高性能对象/关系映射（ORM）库--C＃
高级语言： C#
项目地址: git://github.com/shuxinqin/Chloe.git
创建时间： 2016-03-17T07:06:49Z
项目社区：https://github.com/shuxinqin/Chloe
开源协议：MIT License
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Chloe(克洛伊)

Chloe is a lightweight Object/Relational Mapping(ORM) library.
The query interface is similar to LINQ. You can query data like LINQ and do any things(Join Query | Group Query | Aggregate Query | Insert | Batch Update | Batch Delete | Sharding) by lambda with Chloe.ORM.

Documentation: https://github.com/shuxinqin/Chloe/wiki

NuGet Install Command

Database Install Command
SqlServer Install-Package Chloe.SqlServer
MySql Install-Package Chloe.MySql
Oracle Install-Package Chloe.Oracle
SQLite Install-Package Chloe.SQLite
PostgreSQL Install-Package Chloe.PostgreSQL
达梦 Install-Package Chloe.Dameng
人大金仓 Install-Package Chloe.KingbaseES

License

MIT License

Usage

  • Entity
    ```C#
    public enum Gender
    {
    Male = 1,
    Female
    }

[Table(“Users”)]
public class User
{
[Column(IsPrimaryKey = true)]
[AutoIncrement]
public int Id { get; set; }
public string Name { get; set; }
public Gender? Gender { get; set; }
public int? Age { get; set; }
public int? CityId { get; set; }
public DateTime? OpTime { get; set; }
}

public class City
{
[Column(IsPrimaryKey = true)]
public int Id { get; set; }
public string Name { get; set; }
public int ProvinceId { get; set; }
}

public class Province
{
[Column(IsPrimaryKey = true)]
public int Id { get; set; }
public string Name { get; set; }
}

  1. * **DbContext**
  2. ```C#
  3. IDbContext context = new MsSqlContext(DbHelper.ConnectionString);
  4. IQuery<User> q = context.Query<User>();
  • Query
    ```C#
    IQuery q = context.Query();
    q.Where(a => a.Id > 0).FirstOrDefault();
    q.Where(a => a.Id > 0).ToList();
    q.Where(a => a.Id > 0).OrderBy(a => a.Age).ToList();
    q.Where(a => a.Id > 0).Take(10).OrderBy(a => a.Age).ToList();

q.Where(a => a.Id > 0).OrderBy(a => a.Age).ThenByDesc(a => a.Id).Select(a => new { a.Id, a.Name }).Skip(20).Take(10).ToList();
/*

  • SELECT TOP (10) [T].[Id] AS [Id],[T].[Name] AS [Name] FROM (SELECT [Users].[Id] AS [Id],[Users].[Name] AS [Name],ROW_NUMBER() OVER(ORDER BY [Users].[Age] ASC,[Users].[Id] DESC) AS [ROW_NUMBER_0] FROM [Users] AS [Users] WHERE [Users].[Id] > 0) AS [T] WHERE [T].[ROW_NUMBER_0] > 20
    */

q.Where(a => a.Id > 0).Where(a => a.Name.Contains(“lu”)).ToList();
/*

  • SELECT [Users].[Id] AS [Id],[Users].[Name] AS [Name],[Users].[Gender] AS [Gender],[Users].[Age] AS [Age],[Users].[CityId] AS [CityId],[Users].[OpTime] AS [OpTime]
  • FROM [Users] AS [Users]
  • WHERE ([Users].[Id] > 0 AND [Users].[Name] LIKE ‘%’ + N’lu’ + ‘%’)
    */
    ```
    • Join Query
      ```C#
      MsSqlContext context = new MsSqlContext(DbHelper.ConnectionString);

var user_city_province = context.Query()
.InnerJoin((user, city) => user.CityId == city.Id)
.InnerJoin((user, city, province) => city.ProvinceId == province.Id);

user_city_province.Select((user, city, province) => new { UserId = user.Id, CityName = city.Name, ProvinceName = province.Name }).Where(a => a.UserId == 1).ToList();
/*

  • SELECT [Users].[Id] AS [UserId],[City].[Name] AS [CityName],[Province].[Name] AS [ProvinceName]
  • FROM [Users] AS [Users]
  • INNER JOIN [City] AS [City] ON [Users].[CityId] = [City].[Id]
  • INNER JOIN [Province] AS [Province] ON [City].[ProvinceId] = [Province].[Id]
  • WHERE [Users].[Id] = 1
    */

var view = user_city_province.Select((user, city, province) => new { User = user, City = city, Province = province });

view.Where(a => a.User.Id == 1).ToList();
/*

  • SELECT [Users].[Id] AS [Id],[Users].[Name] AS [Name],[Users].[Gender] AS [Gender],[Users].[Age] AS [Age],[Users].[CityId] AS [CityId],[Users].[OpTime] AS [OpTime],[City].[Id] AS [Id0],[City].[Name] AS [Name0],[City].[ProvinceId] AS [ProvinceId],[Province].[Id] AS [Id1],[Province].[Name] AS [Name1]
  • FROM [Users] AS [Users]
  • INNER JOIN [City] AS [City] ON [Users].[CityId] = [City].[Id]
  • INNER JOIN [Province] AS [Province] ON [City].[ProvinceId] = [Province].[Id]
  • WHERE [Users].[Id] = 1
    */

view.Where(a => a.User.Id == 1).Select(a => new { UserId = a.User.Id, CityName = a.City.Name, ProvinceName = a.Province.Name }).ToList();
/*

  • SELECT [Users].[Id] AS [UserId],[City].[Name] AS [CityName],[Province].[Name] AS [ProvinceName]
  • FROM [Users] AS [Users]
  • INNER JOIN [City] AS [City] ON [Users].[CityId] = [City].[Id]
  • INNER JOIN [Province] AS [Province] ON [City].[ProvinceId] = [Province].[Id]
  • WHERE [Users].[Id] = 1
    */

/*

IGroupingQuery g = q.Where(a => a.Id > 0).GroupBy(a => a.Age);
g = g.Having(a => a.Age > 1 && Sql.Count() > 0);

g.Select(a => new { a.Age, Count = Sql.Count(), Sum = Sql.Sum(a.Age), Max = Sql.Max(a.Age), Min = Sql.Min(a.Age), Avg = Sql.Average(a.Age) }).ToList();
/*

  • SELECT [Users].[Age] AS [Age],COUNT(1) AS [Count],SUM([Users].[Age]) AS [Sum],MAX([Users].[Age]) AS [Max],MIN([Users].[Age]) AS [Min],CAST(AVG([Users].[Age]) AS FLOAT) AS [Avg]
  • FROM [Users] AS [Users]
  • WHERE [Users].[Id] > 0
  • GROUP BY [Users].[Age] HAVING ([Users].[Age] > 1 AND COUNT(1) > 0)
    */
    1. * **Sql Query**
    2. ```C#
    3. context.SqlQuery<User>("select Id,Name,Age from Users where Name=@name", DbParam.Create("@name", "lu")).ToList();
    4. context.SqlQuery<int>("select Id from Users").ToList();
    • Aggregate Query
      ```C#
      IQuery q = context.Query();

q.Select(a => Sql.Count()).First();
/*

  • SELECT TOP (1) COUNT(1) AS [C] FROM [Users] AS [Users]
    */

q.Select(a => new { Count = Sql.Count(), LongCount = Sql.LongCount(), Sum = Sql.Sum(a.Age), Max = Sql.Max(a.Age), Min = Sql.Min(a.Age), Average = Sql.Average(a.Age) }).First();
/*

  • SELECT TOP (1) COUNT(1) AS [Count],COUNT_BIG(1) AS [LongCount],SUM([Users].[Age]) AS [Sum],MAX([Users].[Age]) AS [Max],MIN([Users].[Age]) AS [Min],CAST(AVG([Users].[Age]) AS FLOAT) AS [Average]
  • FROM [Users] AS [Users]
    */

var count = q.Count();
/*

  • SELECT COUNT(1) AS [C] FROM [Users] AS [Users]
    */

var longCount = q.LongCount();
/*

  • SELECT COUNT_BIG(1) AS [C] FROM [Users] AS [Users]
    */

var sum = q.Sum(a => a.Age);
/*

  • SELECT SUM([Users].[Age]) AS [C] FROM [Users] AS [Users]
    */

var max = q.Max(a => a.Age);
/*

  • SELECT MAX([Users].[Age]) AS [C] FROM [Users] AS [Users]
    */

var min = q.Min(a => a.Age);
/*

  • SELECT MIN([Users].[Age]) AS [C] FROM [Users] AS [Users]
    */

var avg = q.Average(a => a.Age);
/*

  • SELECT CAST(AVG([Users].[Age]) AS FLOAT) AS [C] FROM [Users] AS [Users]
    */
    ```
    • Method
      ```C#
      IQuery q = context.Query();

var space = new char[] { ‘ ‘ };

DateTime startTime = DateTime.Now;
DateTime endTime = DateTime.Now.AddDays(1);
q.Select(a => new
{
Id = a.Id,

  1. String_Length = (int?)a.Name.Length,//LEN([Users].[Name])
  2. Substring = a.Name.Substring(0),//SUBSTRING([Users].[Name],0 + 1,LEN([Users].[Name]))
  3. Substring1 = a.Name.Substring(1),//SUBSTRING([Users].[Name],1 + 1,LEN([Users].[Name]))
  4. Substring1_2 = a.Name.Substring(1, 2),//SUBSTRING([Users].[Name],1 + 1,2)
  5. ToLower = a.Name.ToLower(),//LOWER([Users].[Name])
  6. ToUpper = a.Name.ToUpper(),//UPPER([Users].[Name])
  7. IsNullOrEmpty = string.IsNullOrEmpty(a.Name),//too long
  8. Contains = (bool?)a.Name.Contains("s"),//
  9. Trim = a.Name.Trim(),//RTRIM(LTRIM([Users].[Name]))
  10. TrimStart = a.Name.TrimStart(space),//LTRIM([Users].[Name])
  11. TrimEnd = a.Name.TrimEnd(space),//RTRIM([Users].[Name])
  12. StartsWith = (bool?)a.Name.StartsWith("s"),//
  13. EndsWith = (bool?)a.Name.EndsWith("s"),//
  15. DiffYears = Sql.DiffYears(startTime, endTime),//DATEDIFF(YEAR,@P_0,@P_1)
  16. DiffMonths = Sql.DiffMonths(startTime, endTime),//DATEDIFF(MONTH,@P_0,@P_1)
  17. DiffDays = Sql.DiffDays(startTime, endTime),//DATEDIFF(DAY,@P_0,@P_1)
  18. DiffHours = Sql.DiffHours(startTime, endTime),//DATEDIFF(HOUR,@P_0,@P_1)
  19. DiffMinutes = Sql.DiffMinutes(startTime, endTime),//DATEDIFF(MINUTE,@P_0,@P_1)
  20. DiffSeconds = Sql.DiffSeconds(startTime, endTime),//DATEDIFF(SECOND,@P_0,@P_1)
  21. DiffMilliseconds = Sql.DiffMilliseconds(startTime, endTime),//DATEDIFF(MILLISECOND,@P_0,@P_1)
  22. //DiffMicroseconds = Sql.DiffMicroseconds(startTime, endTime),//DATEDIFF(MICROSECOND,@P_0,@P_1)  Exception
  24. AddYears = startTime.AddYears(1),//DATEADD(YEAR,1,@P_0)
  25. AddMonths = startTime.AddMonths(1),//DATEADD(MONTH,1,@P_0)
  26. AddDays = startTime.AddDays(1),//DATEADD(DAY,1,@P_0)
  27. AddHours = startTime.AddHours(1),//DATEADD(HOUR,1,@P_0)
  28. AddMinutes = startTime.AddMinutes(2),//DATEADD(MINUTE,2,@P_0)
  29. AddSeconds = startTime.AddSeconds(120),//DATEADD(SECOND,120,@P_0)
  30. AddMilliseconds = startTime.AddMilliseconds(20000),//DATEADD(MILLISECOND,20000,@P_0)
  32. Now = DateTime.Now,//GETDATE()
  33. UtcNow = DateTime.UtcNow,//GETUTCDATE()
  34. Today = DateTime.Today,//CAST(GETDATE() AS DATE)
  35. Date = DateTime.Now.Date,//CAST(GETDATE() AS DATE)
  36. Year = DateTime.Now.Year,//DATEPART(YEAR,GETDATE())
  37. Month = DateTime.Now.Month,//DATEPART(MONTH,GETDATE())
  38. Day = DateTime.Now.Day,//DATEPART(DAY,GETDATE())
  39. Hour = DateTime.Now.Hour,//DATEPART(HOUR,GETDATE())
  40. Minute = DateTime.Now.Minute,//DATEPART(MINUTE,GETDATE())
  41. Second = DateTime.Now.Second,//DATEPART(SECOND,GETDATE())
  42. Millisecond = DateTime.Now.Millisecond,//DATEPART(MILLISECOND,GETDATE())
  43. DayOfWeek = DateTime.Now.DayOfWeek,//(DATEPART(WEEKDAY,GETDATE()) - 1)
  45. Int_Parse = int.Parse("1"),//CAST(N'1' AS INT)
  46. Int16_Parse = Int16.Parse("11"),//CAST(N'11' AS SMALLINT)
  47. Long_Parse = long.Parse("2"),//CAST(N'2' AS BIGINT)
  48. Double_Parse = double.Parse("3"),//CAST(N'3' AS FLOAT)
  49. Float_Parse = float.Parse("4"),//CAST(N'4' AS REAL)
  50. //Decimal_Parse = decimal.Parse("5"),//CAST(N'5' AS DECIMAL)  ps: 'Decimal.Parse(string s)' is not supported now,because we don't know the precision and scale information.
  51. Guid_Parse = Guid.Parse("D544BC4C-739E-4CD3-A3D3-7BF803FCE179"),//CAST(N'D544BC4C-739E-4CD3-A3D3-7BF803FCE179' AS UNIQUEIDENTIFIER) AS [Guid_Parse]
  53. Bool_Parse = bool.Parse("1"),//CASE WHEN CAST(N'1' AS BIT) = CAST(1 AS BIT) THEN CAST(1 AS BIT) WHEN NOT (CAST(N'1' AS BIT) = CAST(1 AS BIT)) THEN CAST(0 AS BIT) ELSE NULL END AS [Bool_Parse]
  54. DateTime_Parse = DateTime.Parse("1949-10-01"),//CAST(N'1949-10-01' AS DATETIME) AS [DateTime_Parse]
  56. B = a.Age == null ? false : a.Age > 1,

}).ToList();

  1. * **Insert**
  2. ```C#
  3. IDbContext context = new MsSqlContext(DbHelper.ConnectionString);
  5. //return the key value
  6. int id = (int)context.Insert<User>(() => new User() { Name = "lu", Age = 18, Gender = Gender.Male, CityId = 1, OpTime = DateTime.Now });
  7. /*
  8.  * INSERT INTO [Users]([Name],[Age],[Gender],[CityId],[OpTime]) VALUES(N'lu',18,1,1,GETDATE());SELECT @@IDENTITY
  9.  */
  12. User user = new User();
  13. user.Name = "lu";
  14. user.Age = 18;
  15. user.Gender = Gender.Male;
  16. user.CityId = 1;
  17. user.OpTime = new DateTime(1970, 1, 1);
  19. user = context.Insert(user);
  20. /*
  21.  * String @P_0 = "lu";
  22.    Gender @P_1 = Male;
  23.    Int32 @P_2 = 18;
  24.    Int32 @P_3 = 1;
  25.    DateTime @P_4 = "1970/1/1 0:00:00";
  26.    INSERT INTO [Users]([Name],[Gender],[Age],[CityId],[OpTime]) VALUES(@P_0,@P_1,@P_2,@P_3,@P_4);SELECT @@IDENTITY
  27.  */
  • Update
    ```C#
    MsSqlContext context = new MsSqlContext(DbHelper.ConnectionString);

context.Update(a => a.Id == 1, a => new User() { Name = a.Name, Age = a.Age + 1, Gender = Gender.Male, OpTime = DateTime.Now });
/*

  • UPDATE [Users] SET [Name]=[Users].[Name],[Age]=([Users].[Age] + 1),[Gender]=1,[OpTime]=GETDATE() WHERE [Users].[Id] = 1
    */

context.Update(a => a.Gender == Gender.Woman, a => new User() { Age = a.Age - 1, OpTime = DateTime.Now });
/*

  • UPDATE [Users] SET [Age]=([Users].[Age] - 1),[OpTime]=GETDATE() WHERE [Users].[Gender] = 2
    */

User user = new User();
user.Id = 1;
user.Name = “lu”;
user.Age = 28;
user.Gender = Gender.Male;
user.OpTime = DateTime.Now;

context.Update(user); //update all columns
/*

  • String @P_0 = “lu”;
    Gender @P_1 = Male;
    Int32 @P_2 = 28;
    Nullable @P_3 = NULL;
    DateTime @P_4 = “2016/7/8 11:28:27”;
    Int32 @P_5 = 1;
    UPDATE [Users] SET [Name]=@P_0,[Gender]=@P_1,[Age]=@P_2,[CityId]=@P_3,[OpTime]=@P_4 WHERE [Users].[Id] = @P_5
    */

context.TrackEntity(user);//track entity
user.Name = user.Name + “1”;
context.Update(user);//update the column ‘Name’ only
/*

  • String @P_0 = “lu1”;
    Int32 @P_1 = 1;
    UPDATE [Users] SET [Name]=@P_0 WHERE [Users].[Id] = @P_1
    */
    ```
    • Delete
      ```C#
      MsSqlContext context = new MsSqlContext(DbHelper.ConnectionString);

context.Delete(a => a.Id == 1);
/*

  • DELETE [Users] WHERE [Users].[Id] = 1
    */

context.Delete(a => a.Gender == null);
/*

  • DELETE [Users] WHERE [Users].[Gender] IS NULL
    */

User user = new User();
user.Id = 1;
context.Delete(user);
/*

  • Int32 @P_0 = 1;
    DELETE [Users] WHERE [Users].[Id] = @P_0
    */
    ```