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

License

MIT License

Usage

• Entity

  
  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; } }

* **DbContext**
```C#
IDbContext context = new MsSqlContext(DbHelper.ConnectionString);
IQuery<User> q = context.Query<User>();

• Query

  
  IQuery<User> q = context.Query<User>();
  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

  
  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 */

/*

• Chloe also supports left join,right join and full join query.
• For details please see 'https://github.com/shuxinqin/Chloe/blob/master/src/Chloe/IQuery%60.cs'. */

• Group Query

  
  IQuery<User> q = context.Query<User>();

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) */

• Sql Query

  context.SqlQuery<User>("select Id,Name,Age from Users where Name=@name", DbParam.Create("@name", "lu")).ToList();
  context.SqlQuery<int>("select Id from Users").ToList();

• Aggregate Query

  
  IQuery<User> q = context.Query<User>();

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

  
  IQuery<User> q = context.Query<User>();

var space = new char[] { ' ' };

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

String_Length = (int?)a.Name.Length,//LEN([Users].[Name])
Substring = a.Name.Substring(0),//SUBSTRING([Users].[Name],0 + 1,LEN([Users].[Name]))
Substring1 = a.Name.Substring(1),//SUBSTRING([Users].[Name],1 + 1,LEN([Users].[Name]))
Substring1_2 = a.Name.Substring(1, 2),//SUBSTRING([Users].[Name],1 + 1,2)
ToLower = a.Name.ToLower(),//LOWER([Users].[Name])
ToUpper = a.Name.ToUpper(),//UPPER([Users].[Name])
IsNullOrEmpty = string.IsNullOrEmpty(a.Name),//too long
Contains = (bool?)a.Name.Contains("s"),//
Trim = a.Name.Trim(),//RTRIM(LTRIM([Users].[Name]))
TrimStart = a.Name.TrimStart(space),//LTRIM([Users].[Name])
TrimEnd = a.Name.TrimEnd(space),//RTRIM([Users].[Name])
StartsWith = (bool?)a.Name.StartsWith("s"),//
EndsWith = (bool?)a.Name.EndsWith("s"),//

DiffYears = Sql.DiffYears(startTime, endTime),//DATEDIFF(YEAR,@P_0,@P_1)
DiffMonths = Sql.DiffMonths(startTime, endTime),//DATEDIFF(MONTH,@P_0,@P_1)
DiffDays = Sql.DiffDays(startTime, endTime),//DATEDIFF(DAY,@P_0,@P_1)
DiffHours = Sql.DiffHours(startTime, endTime),//DATEDIFF(HOUR,@P_0,@P_1)
DiffMinutes = Sql.DiffMinutes(startTime, endTime),//DATEDIFF(MINUTE,@P_0,@P_1)
DiffSeconds = Sql.DiffSeconds(startTime, endTime),//DATEDIFF(SECOND,@P_0,@P_1)
DiffMilliseconds = Sql.DiffMilliseconds(startTime, endTime),//DATEDIFF(MILLISECOND,@P_0,@P_1)
//DiffMicroseconds = Sql.DiffMicroseconds(startTime, endTime),//DATEDIFF(MICROSECOND,@P_0,@P_1)  Exception

AddYears = startTime.AddYears(1),//DATEADD(YEAR,1,@P_0)
AddMonths = startTime.AddMonths(1),//DATEADD(MONTH,1,@P_0)
AddDays = startTime.AddDays(1),//DATEADD(DAY,1,@P_0)
AddHours = startTime.AddHours(1),//DATEADD(HOUR,1,@P_0)
AddMinutes = startTime.AddMinutes(2),//DATEADD(MINUTE,2,@P_0)
AddSeconds = startTime.AddSeconds(120),//DATEADD(SECOND,120,@P_0)
AddMilliseconds = startTime.AddMilliseconds(20000),//DATEADD(MILLISECOND,20000,@P_0)

Now = DateTime.Now,//GETDATE()
UtcNow = DateTime.UtcNow,//GETUTCDATE()
Today = DateTime.Today,//CAST(GETDATE() AS DATE)
Date = DateTime.Now.Date,//CAST(GETDATE() AS DATE)
Year = DateTime.Now.Year,//DATEPART(YEAR,GETDATE())
Month = DateTime.Now.Month,//DATEPART(MONTH,GETDATE())
Day = DateTime.Now.Day,//DATEPART(DAY,GETDATE())
Hour = DateTime.Now.Hour,//DATEPART(HOUR,GETDATE())
Minute = DateTime.Now.Minute,//DATEPART(MINUTE,GETDATE())
Second = DateTime.Now.Second,//DATEPART(SECOND,GETDATE())
Millisecond = DateTime.Now.Millisecond,//DATEPART(MILLISECOND,GETDATE())
DayOfWeek = DateTime.Now.DayOfWeek,//(DATEPART(WEEKDAY,GETDATE()) - 1)

Int_Parse = int.Parse("1"),//CAST(N'1' AS INT)
Int16_Parse = Int16.Parse("11"),//CAST(N'11' AS SMALLINT)
Long_Parse = long.Parse("2"),//CAST(N'2' AS BIGINT)
Double_Parse = double.Parse("3"),//CAST(N'3' AS FLOAT)
Float_Parse = float.Parse("4"),//CAST(N'4' AS REAL)
//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.
Guid_Parse = Guid.Parse("D544BC4C-739E-4CD3-A3D3-7BF803FCE179"),//CAST(N'D544BC4C-739E-4CD3-A3D3-7BF803FCE179' AS UNIQUEIDENTIFIER) AS [Guid_Parse]

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]
DateTime_Parse = DateTime.Parse("1949-10-01"),//CAST(N'1949-10-01' AS DATETIME) AS [DateTime_Parse]

B = a.Age == null ? false : a.Age > 1,

}).ToList();

* **Insert**
```C#
IDbContext context = new MsSqlContext(DbHelper.ConnectionString);

//return the key value
int id = (int)context.Insert<User>(() => new User() { Name = "lu", Age = 18, Gender = Gender.Male, CityId = 1, OpTime = DateTime.Now });
/*
 * INSERT INTO [Users]([Name],[Age],[Gender],[CityId],[OpTime]) VALUES(N'lu',18,1,1,GETDATE());SELECT @@IDENTITY
 */


User user = new User();
user.Name = "lu";
user.Age = 18;
user.Gender = Gender.Male;
user.CityId = 1;
user.OpTime = new DateTime(1970, 1, 1);

user = context.Insert(user);
/*
 * String @P_0 = "lu";
   Gender @P_1 = Male;
   Int32 @P_2 = 18;
   Int32 @P_3 = 1;
   DateTime @P_4 = "1970/1/1 0:00:00";
   INSERT INTO [Users]([Name],[Gender],[Age],[CityId],[OpTime]) VALUES(@P_0,@P_1,@P_2,@P_3,@P_4);SELECT @@IDENTITY
 */

• Update

  
  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

  
  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 */