bitnic.orm 2.0.8

ORM-1_21

• Table Map
• Attribute
• Linq to SQL
• Native SQL
• Transaction
• Interfaces
• Accessing another database
• Work with subclasses
• License

Simple micro ОРМ ( MySql, PostgreSQL, MSSQL, Sqlite).
Allows access to different databases (MSSQL, Postgresql, MySQL, Sqlite) from one application context.
CodeFirst, Linq to sql, free sql.

Restrictions.

All bases must be created before use, with the exception of Sqlite,
if the file does not exist, the ORM will create it.
Write to log file=debug mode only.
install database provider from NuGet: (Npgsql, Mysql.Data, System.Data.SQLite, System.Data.SqlClient).
Enum type is stored in the database as an integer.
Primary key is Allowed on one field.

Quick start

using ORM_1_21_;

string path = null;
#if DEBUG
    path = "SqlLog.txt";
#endif
_ = new Configure("ConnectionString",ProviderName.Postgresql, path);
    using (var ses=Configure.Session)
    {
      if (ses.TableExists<MyClass>())
       {
         ses.DropTable<MyClass>();
       }
      if (ses.TableExists<MyClass>() == false)
       {
         ses.TableCreate<MyClass>();
       }
    } 
    using (ISession session = Configure.Session)
    {
        session.InsertBulk(new List<MyClass>(){
                new MyClass{ Age = 40, Name = "name40"},
                new MyClass{ Age = 20, Name = "name20" },
                new MyClass{ Age = 30, Name = "name30" },
                new MyClass{ Age = 50, Name = "name" },
                new MyClass{ Age = 60, Name = "name" },
                new MyClass{ Age = 10, Name = "name" },
            }
        );
        session.Query<MyClass>().Where(a => a.Age < 50).ForEach(s =>
        {
            Console.WriteLine($@"{s.Name} - {s.Age}");
        });
    } 

Please note: Restrictions for PostgreSQL.
The date is stored in the olden mode.
Correction:

AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);
AppContext.SetSwitch("Npgsql.DisableDateTimeInfinityConversions", true);

ORM adds itself. <a name="tablemap"></a>

Tables Map.

using ORM_1_21_;

 [MapTable("my_class")]// or [MapTable]
 class MyClass
 {
     [MapPrimaryKey("id", Generator.Assigned)]//or [MapPrimaryKey(Generator.Assigned)]
      public Guid Id { get; set; } = Guid.NewGuid();

     [MapColumn("name")] //or [MapColumn]
     public string Name { get; set; }

     [MapColumn("age")] //or [MapColumn]
     [MapIndex]
     [MapDefaultValue("NOT NULL DEFAULT '5'")] 
      public int Age { get; set; }

     [MapColumn("desc")] //or [MapColumn]
     [MapColumnType("TEXT")]
      public string Description { get; set; }

     [MapColumn("enum")] //or [MapColumn] 
      public MyEnum MyEnum { get; set; } = MyEnum.First;

     [MapColumn("date")] //or [MapColumn] 
      public DateTime DateTime { get; set; } = DateTime.Now;
 }

<a name="attribute"></a>

Attribute.

Table name:

using ORM_1_21_;


//using Postgresql
class PeopleAllBase
{
    [MapPrimaryKey("id", Generator.Native)]
    public long Id { get; set; }
    [MapColumn("name")]
    public string Name { get; set; }
    [MapColumn("age")]
    public int Age { get; set; }
}

[MapTable("People")]
class PeopleAll : PeopleAllBase {}

[MapTable("People"," \"age\" < 55")]
class PeopleYoung :PeopleAllBase {}

[MapTable("People", " \"age\" >= 55")]
class PeopleOld : PeopleAllBase { }
.......
  ISession session = Configure.Session;
  if (session.TableExists<PeopleAll>())
  {
      session.DropTable<PeopleAll>();
  }

  session.TableCreate<PeopleAll>();
  for (int i = 0; i < 10; i++)
  {
      session.Insert(new PeopleAll() { Age = i * 10, Name = "simpleName" });
  }
  session.Query<PeopleAll>().ForEach(a =>
  {
      Console.WriteLine($@" {a.Name} {a.Age}");
  });
  //sql:SELECT "People"."id", "People"."name", "People"."age" FROM "People"

   session.Query<PeopleYoung>().Where(a => a.Name.StartsWith("simple")).ForEach(b =>
  {
      Console.WriteLine($@" Young {b.Name} {b.Age}");
  });
  //sql:SELECT "People"."id", "People"."name", "People"."age" FROM "People" 
  //WHERE ("People"."name" LIKE CONCAT(@p1,'%')) and ( "age" < 55) params:  @p1 - simple 

   session.Query<PeopleOld>().Where(a=>a.Name.StartsWith("simple")).ForEach(b =>
  {
      Console.WriteLine($@" Old {b.Name} {b.Age}");
  });
  //sql:SELECT "People"."id", "People"."name", "People"."age" FROM "People" 
  //WHERE ("People"."name" LIKE CONCAT(@p1,'%')) and ( "age" >= 55) params:  @p1 - simple 

Column Name,Index,Not Insert and Update,Type,Default value

using ORM_1_21_;


public class TestTSBase
{
    [MapPrimaryKey("id", Generator.Assigned)]
    public Guid Id { get; set; } = Guid.NewGuid();
    [MapIndex]
    [MapColumn("name")] 
    public string Name { get; set; }
}

[MapTable("TS2")]
public class TSMsSql : TestTSBase
{
    [MapNotInsertUpdate]
    [MapColumn("ts")]
    [MapColumnType("rowversion")]
    [MapDefaultValue("")]
    public byte[] Ts { get; set; } 
}
 var session=Configure.Session;
 session.TableCreate<TSMsSql>();
 session.Insert(new TSMsSql { Name = "123" });
 var t=session.Query<TSMsSql>().Single();
 session.Update(t);
 var res = session.Update(t, new AppenderWhere(session.ColumnName<TSMsSql>(d => d.Ts), t.Ts));

// using MsSql
IF not exists (select 1 from information_schema.tables where table_name = 'TS2')CREATE TABLE [dbo].[TS2](
[id] uniqueIdentifier default (newId()) primary key,
 [ts] rowversion ,
 [name] [NVARCHAR] (256) NULL,
);
CREATE INDEX [INDEX_TS2_name] ON [TS2] (name);

INSERT INTO [TS2] ([TS2].[id], [TS2].[name]) VALUES (@p1,@p2) ; params:  @p1 - 03ced090-affd-4cf5-be48-3329267b2b98  @p2 - 123 
SELECT TOP (2)  [TS2].[ts] AS ts2____ts, [TS2].[name] AS ts2____name, [TS2].[id] AS ts2____id FROM [TS2]; 
UPDATE [TS2] SET  [TS2].[name] = @p1 WHERE [TS2].[id] = @p2; params:  @p1 - 123  @p2 - 03ced090-affd-4cf5-be48-3329267b2b98 
UPDATE [TS2] SET  [TS2].[name] = @p1 WHERE [TS2].[id] = @p2   AND [ts] = @p3; params:  @p1 - 123  @p2 - 03ced090-affd-4cf5-be48-3329267b2b98  @p3 - System.Byte[] 
 

Primary Key

[MapPrimaryKey("id", Generator.Assigned)] - Assigned by user.
[MapPrimaryKey("id", Generator.Native)] - Designates a database as an auto-increment column.
[MapPrimaryKey(Generator.Assigned)] - Assigned by user. Column name from name property Example: Postgres uuid primary key auto generate.

// postgres
[MapTable("test_uuid")]
class TestUuid
{
    [MapColumnType(" uuid")]
    [MapDefaultValue("DEFAULT uuid_generate_v4() PRIMARY KEY")]
    [MapPrimaryKey("id",Generator.Native)]
    public Guid id { get; set; }
    [MapColumn("name")]
    public string Name { get; set; }   
}

CREATE TABLE IF NOT EXISTS "test_uuid"
(
 "id" uuid NOT NULL DEFAULT uuid_generate_v4() PRIMARY KEY,
 "name" character varying(256) ,
)

[MapPrimaryKey("id", Generator.NativeNotReturningId,)] - Designates a database,At insertion record, id record is not referred on client.
Example: Mysql uuid primary key auto generate.

[MapTable]
class TestMySqlUUid
{
    [MapColumnType("binary(16) default (uuid_to_bin(uuid()))")]
    [MapDefaultValue("not null primary key")]
    [MapPrimaryKey("id", Generator.NativeNotReturningId)]
    public Guid Id { get; set; }
    [MapColumn]
    public string Name { get; set; }
}

Serialization to JSON

class Foo
{
  [MapColumn("my_test")]
  public F MyTest { get; set; }
}

public class F: IMapSerializable
{ 
  public string Serialize()
  {    
  }
  public void Deserialize(string str)
  {          
  }
}
User Serialization. Using the Interface IMapSerializable.

<span style="color:red">Important</span>.

By default, no constructor and initializer is called for map type.
To make this work, the type must be marked MapUsageActivatorAttribute
Having a default constructor

[MapUsageActivator]
class Foo
{
  public Fo(){}
  public int IntFoo{get;set;}=5;
}

<a name="linqtosql"></a>

Ling To SQL.

Methods: Join, GroupJoin, Concat, Cast, Select, SelectMany, Aggregate, GroupBy, Except
have no implementation, they are overridden method name Core ending.

Example:
session.Query<MyClass>().Join(session.Query<MyClass>(), a => a.Age, b => b.Age,
                    (aa, bb) => new { name1=aa.Name, name2=bb.Name }).ToList();
// Error: Method Join for IQueryable is not implemented, use method JoinCore or ...toList().Join()
Alternative:
session.Query<MyClass>().JoinCore(session.Query<MyClass>(), a => a.Age, b => b.Age,
                     (aa, bb) => new { name1 = aa.Name, name2 = bb.Name }).ToList();
Or:
session.Query<MyClass>().ToList().Join(session.Query<MyClass>(), a => a.Age, b => b.Age,
                     (aa, bb) => new { name1 = aa.Name, name2 = bb.Name }).ToList();

using ORM_1_21_;


var expSql = Configure.Session.Query<MyClass>().
Where(a => (a.Age > 5 || a.Name.StartsWith("nam")) && a.Name.Contains("1")).
OrderBy(d => d.Age).
Select(f => new { age = f.Age }).
Limit(0, 2);
var list=expSql.ToList();

real sql:

// Postgresql
SELECT "my_class5"."age" FROM "my_class5" WHERE ((("my_class5"."age" > 5) 
or ("my_class5"."name" LIKE CONCAT(@p1,'%'))) and 
("my_class5"."name" LIKE CONCAT('%',@p2,'%'))) ORDER BY "my_class5"."age" Limit 2 OFFSET 0;
params:  @p1 - nam  @p2 - 1 

Update:

var count = session.Query<MyClass>().Where(a => a.Age == 10).Update(d => new Dictionary<object, object>
{
  { d.Name, string.Concat(d.Name, d.Age) },
  { d.DateTime, DateTime.Now }
});

Delete

session.Query<MyClass>().Delete(a => a.Age == 10);

Insert Bulk:

var count=session.InsertBulk(new List<MyClass>()
{
   new MyClass { Age = 40, Name = "name", MyTest = new MyTest { Name = "simple" } },
   new MyClass { Age = 20, Name = "name1", MyTest = new MyTest { Name = "simple" } },
});

Distinct:

var d1 = Configure.Session.Query<MyClass>().Distinct(a => a.Name);
var d2 = Configure.Session.Query<MyClass>().Distinct(a => new {a.Age,a.Name});

SetTimeOut сurrent request:

var f = await session.Query<MyClass>().Where(a => a.Age > 0).SetTimeOut(30).SingleOrDefaultAsync();

<span style="color:red">Important</span>
Replace expression in queries "str1"+"str2" to string.Concat("str1","str2")

Sql Builder:

ISession session = Configure.Session;

var sql = $"select * from {session.TableName<MyClass>()} where {session.ColumnName<MyClass>(a => a.Age)} > {session.SymbolParam}1";
// for Postgres: select * from "my_class5" where "age" > @1
// for MSSQL   : select * from [my_class5] where [age] > @1
// for MySql   : select * from `my_class5` where `age` > ?1
// for SqLite  : select * from "my_class5" where "age" > @1
var res=session.FreeSql<MyClass>(sql, 10);

Extensions:

static class Help
{
    public static IEnumerable<object> Foo<TSource>(this IQueryable<TSource> source, Func<TSource, object> func)
    {
        var res = source.Provider.Execute<IEnumerable<TSource>>(source.Expression);
        foreach (var re in res)
        {
            yield return func(re);
        }
    }

    public static async Task<IEnumerable<object>> FooAsync<TSource>(this IQueryable<TSource> source,
        Func<TSource, object> func, CancellationToken cancellationToken = default)
    {
        var res = await source.Provider.ExecuteAsync<IEnumerable<TSource>>(source.Expression, cancellationToken);
        return res.Select(func);
    }
}

 foreach (var o in await session.Query<MyClass>().Select(a => new { a.Age }).FooAsync(a => a.Age + 30))
 {
     Console.WriteLine(o);
 }

<a name="nativesql"></a>

Native SQL.

example class map native:

var session = Configure.Session;
var list = session.FreeSql<MyClass>($"select * from {session.TableName<MyClass>()} where \"name\" LIKE CONCAT(@p1,'%')","name").ToList();
// where MyClass have MapAttribute

example: (dynamic)

 foreach (var r in Configure.Session.FreeSql<dynamic>("select enum as enum1,age from my_class"))
   Console.WriteLine($" enum1={r.enum1} age={r.age}");

example: (one column)

 foreach (var r in Configure.Session.FreeSql<MyEnum>("select enum as enum1 from my_class"))
   Console.WriteLine($" enum={r}");

example: (using attribute:MapReceiverFreeSqlAttribute) the presence of a constructor with parameters

[MapReceiverFreeSql]
 lass MyFreeSql
 {
     public Guid IdGuid { get; }
     public string Name { get; }
     public int Age { get; }
     public MyEnum MyEnum { get; }
     public MyFreeSql(Guid idGuid, string name, int age, MyEnum @enum)
     {
         IdGuid = idGuid;
         Name = name;
         Age = age;
         MyEnum = (MyEnum)@enum;
     }
 }
.....

var tempFree = session.FreeSql<MyFreeSql>($"select id,name,age,enum from {session.TableName<MyClass>()}");
//Caution!
//Sequence of types from select: select id,name,age,enum 
//Must match the sequence of constructor parameter types.: MyFreeSql(Guid idGuid, string name, int age, MyEnum @enum)

example: simple class

 сlass MySimpleFreeSql
 {
     public Guid id { get; }
     public string name { get; }
   
 }
.....

var tempFree = session.FreeSql<MyFreeSql>($"select id, name  {session.TableName<MyClass>()}");
//Caution!
//Table column names in sql query ( id ,name)
//Must match the name of the public properties of the type

example: (anonymous type)

 static IEnumerable<T> TempSql<T>(T t)
 {
   return Configure.Session.FreeSql<T>("select enum as enum1,age from my_class");
 }
 foreach (var r in TempSql(new { enum1 = 1, age = 2 }))
    Console.WriteLine($"{r}");

example: (anonymous type)

  var res = Configure.Session.FreeSqlAsTemplate(new { id = 1, number = 1 },
  $"select id, number from {session.TableName<MyClass>()}").ToList();

<a name="interfaces"></a>

Interfaces.

 class MyClass : IMapAction<MyClass>
 {
   public void ActionCommand(MyClass item, CommandMode mode)
   {
       
   }
 }
....
 public enum CommandMode
 {
     /// <summary>
     /// None
     /// </summary>
     None,
     /// <summary>
     /// Before Update
     /// </summary>
     BeforeUpdate,
     /// <summary>
     /// Before Insert
     /// </summary>
     BeforeInsert,
     /// <summary>
     /// Before Delete
     /// </summary>
     BeforeDelete,
     /// <summary>
     /// After Update
     /// </summary>
     AfterUpdate,
     /// <summary>
     /// After Insert
     /// </summary>
     AfterInsert,
     /// <summary>
     /// After Delete
     /// </summary>
     AfterDelete,
 }

<a name="transaction"></a>

Transaction.

 ISession session = Configure.Session;
 var tr=session.BeginTransaction();
 try
 {
    session.Insert(new MyClass { Age=6,DateTime=DateTime.Now,Description="bla"});
    tr.Commit();
 }catch(Exception)
 {
    tr.Rollback();
    throw;
 }
 finally
 {
    session.Dispose();
 }  

 using (ISession session = await Configure.SessionAsync)
 {
    using (var tr = await session.BeginTransactionAsync())
    {
        // insert, update 
    }
 }

<a name="anotherdatabase"></a>

Accessing another database.

Getting a session

var session=Configure.GetSession<TS>() //where TS : IOtherDataBaseFactory ,new()

The type that implements the interface:IOtherDataBaseFactory
the type must have a public constructor.

 /// <summary>
 /// Interface for accessing a foreign database
 /// </summary>
 public interface IOtherDataBaseFactory
 {
     /// <summary>
     /// Type database
     /// </summary>
     ProviderName GetProviderName();

     /// <summary>
     /// Getting the DbProviderFactory for the selected database
     /// </summary>
     DbProviderFactory GetDbProviderFactories();

     /// <summary>
     /// Database connection string
     /// </summary>
     string GetConnectionString();
 }

example MySql

 public  class MyDbMySql : IOtherDataBaseFactory
 {
   private static readonly Lazy<DbProviderFactory> DbProviderFactory = 
       new Lazy<DbProviderFactory>(() => new MySqlClientFactory());
   public ProviderName GetProviderName()
   {
       return ProviderName.MySql;
   }
   public string GetConnectionString()
   {
       return ConnectionStrings.Mysql;
   }

   public DbProviderFactory GetDbProviderFactories()
   {
       return DbProviderFactory.Value;
   }
 }

example Postgres

public class MyDbPostgres : IOtherDataBaseFactory
{
  private static readonly Lazy<DbProviderFactory> DbProviderFactory = 
      new Lazy<DbProviderFactory>(() => Npgsql.NpgsqlFactory.Instance);
  public ProviderName GetProviderName()
  {
      return ProviderName.Postgresql;
  }
  public string GetConnectionString()
  {
      return ConnectionStrings.Postgesql;
  }

  public DbProviderFactory GetDbProviderFactories()
  {
      return DbProviderFactory.Value;
  }
}

example MsSql

public class MyDbMsSql : IOtherDataBaseFactory
{
    private static readonly Lazy<DbProviderFactory> DbProviderFactory = 
        new Lazy<DbProviderFactory>(() => System.Data.SqlClient.SqlClientFactory.Instance);
    public ProviderName GetProviderName()
    {
        return ProviderName.MsSql;
    }
    public string GetConnectionString()
    {
        return ConnectionStrings.MsSql;
    }

    public DbProviderFactory GetDbProviderFactories()
    {
        return DbProviderFactory.Value;
    }
}

example SQLite

public class MyDbSqlite : IOtherDataBaseFactory
{
    private static readonly Lazy<DbProviderFactory> DbProviderFactory = 
        new Lazy<DbProviderFactory>(() => System.Data.SQLite.SQLiteFactory.Instance);
    public ProviderName GetProviderName()
    {
        return ProviderName.Sqlite;
    }
    public string GetConnectionString()
    {
        return ConnectionStrings.Sqlite;
    }

    public DbProviderFactory GetDbProviderFactories()
    {
        return DbProviderFactory.Value;
    }
}

<span style="color:red">Important</span>
The session is opened only for this database
Type to use only for a specific database

Stored Procedures

Example Mysql:

DROP procedure IF EXISTS `getCountList`;
CREATE  PROCEDURE `getCountList`(IN maxAge int,out myCount int)
BEGIN
  select count(*) INTO myCount from my_class5 where age < maxAge;
  select * from my_class5  where age < maxAge;
END;
DROP procedure IF EXISTS `getList`;

CREATE PROCEDURE `getList`()
BEGIN
    select * from my_class5;
END;

var list =  (IEnumerable<MyClass>)session.ProcedureCall<MyClass>("getList");
var par1 = new ParameterStoredPr("maxAge", 100, ParameterDirection.Input);
var par2 = new ParameterStoredPr("myCount", 120, ParameterDirection.Output);
list = (IEnumerable<MyClass>) session.ProcedureCallParam<MyClass>("getCountList", par1, par2);
var count=par2.Value;

<a name="subclass"></a>

Work with subclasses

[MapTable("test_sub_class")]//Mandatory table name
class TSuperClass
{
    [MapPrimaryKey(Generator.Assigned)]
    public Guid Id { get; set; } = Guid.NewGuid();
    [MapColumn]
    public string Name { get; set; }
}

class TSubClass : TSuperClass
{
    [MapColumn]
    public int Age { get; set; }
}

class TCoreClass : TSubClass
{
    [MapColumn]
    public string Description { get; set; }
}
...
session.DropTableIfExists<TCoreClass>();
session.TableCreate<TCoreClass>();
session.InsertBulk(new List<TCoreClass>()
{
    new TCoreClass(){Age = 20,Name = "20",Description = "20"},
    new TCoreClass(){Age = 20,Name = "20",Description = "20"},
    new TCoreClass(){Age = 20,Name = "20",Description = "20"},
});
var s1 = session.Query<TCoreClass>().ToList();
var s2 = session.Query<TSubClass>().ToList();
var s3 = session.Query<TSuperClass>().ToList();

var tableName = session.TableName<TSubClass>();
var s4 = session.FreeSql<TSuperClass>($"select * from {tableName}");
var s5 = session.FreeSql<TSubClass>($"select * from {tableName}");
var s6 = session.FreeSql<TCoreClass>($"select * from {tableName}");