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
| 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 |
MIT License
- 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
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<User>()
.InnerJoin<City>((user, city) => user.CityId == city.Id)
.InnerJoin<Province>((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<User> 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
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<User>(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<User>(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<Int32> @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<User>(a => a.Id == 1);
/*
* DELETE [Users] WHERE [Users].[Id] = 1
*/
context.Delete<User>(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
*/
