Dapper

Ro'zimurod Abdunazarov

Dapper - bu SQL so'rovlari natijalarini C# sinflari bilan taqqoslaydigan almashinuv vositasi. Ishlash tizimi EntityFreamwork ga ham o’xshaydi,ammo undan tezroq ishlaydi. Hammamiz biladigan https://stackoverflow.com/ saytining qidiruv tizimi ham Dapper yordamida tuzilgan.

Shuningdek Dapper oldingi Ado.Net ning avlodi hisoblanadi.Shuning uchun ham tuzilma Ado.Net bilan juda o'xshash.

Endi amaliyot bilan shug’ullansak, Man Dapper bilan ishlash ko’nikmasini shakllantirish uchun,kompyuterni uncha qiynamaydigan bir nechta dasturlarni o’rnatib olaman.VsCode, MsSqlLocalDb, Dotnet lar bo’lsa bo’ldi.

dotnet new mvc –o DapperApp

Loyihaga yangi kutubxonalarni qo’shamiz:

dotnet add package Microsoft.Data.SqlClient
dotnet add package Dapper

Yangi ma'lumotlar bazasi qurib olamiz:

CREATE DATABASE Users

Yangi jadval quramiz. (Bu kodlar faqat MsSql uchun)

CREATE TABLE People (
    Id INT PRIMARY KEY,
    FullName VARCHAR(MAX),
    Age INT NOT NULL,
    Email VARCHAR(MAX) NOT NULL
);

Jadvalni to’ldiramiz. (Bu kodlar faqat MsSql uchun)

INSERT INTO People VALUES 
   (1,'Ruzimurod Abdunazarov',19,'[email protected]');
INSERT INTO People VALUES 
   (2,'Eldor Axmedov',18,'[email protected]');
INSERT INTO People VALUES 
   (3,'Umid Abdusattorov',35,'[email protected]');
INSERT INTO People VALUES 
   (4,NULL,11,'[email protected]');
INSERT INTO People VALUES 
   (5,'Farzona Holmo''minova',16,'[email protected]');
INSERT INTO People VALUES 
   (6,'Doston Ibragimov',30,'[email protected]');
INSERT INTO People VALUES    
   (7,'Jasur Tursunov',25,'[email protected]');
INSERT INTO People VALUES    
   (8,NULL,24,'[email protected]');
INSERT INTO People VALUES    
   (9,'Mohichexra Davronova',16,'[email protected]');
INSERT INTO People VALUES    
   (10,'Davron Sattorov',26,'[email protected]');

Keyin umumiy malumotlar ombori quyidagicha bo’ladi:

Bu malumotlar asosida yangi model tuzib olamiz.

public class User
{
    public int Id { get; set; }
    [DisplayName("Ф.И.О")]
    public string? FullName { get; set; }
    [DisplayName("Возраст")]
    public int Age { get; set; }
    [DisplayName("Электронная почта")]
    [Required]
    public string? Email { get; set; }
}

Keyingi bosqichda malumotlar bazasidan malumot olib kelish uchun Dapper ORM(Object Relation Mapper) dan foydalanamiz.

public interface IUserRepository
{
    int MaxId { get; }
    void Create(User user);
    void Delete(int id);
    User Get(int id);
    List<User> GetAll();
    void Update(User user);
    int Count { get; }
}

Birinchi IUserRepository interfeysini qurib olamiz. Endi UserRepository ni yozamiz. Kodlar asosan SQL ni o’zidagi Query da yoziladi, shuning uchun ham Dapper EfCore ga qaraganda tezroq ishlaydi.

1] Umumiy barcha User larni olib kelish uchun quyidagicha qilamiz.

public List<User> GetAll()
{
    using (IDbConnection db = new SqlConnection(_connectionString))
    {
        return db.Query<User>("SELECT * FROM People").ToList();
    }
}

Shu yerda bir narsaga e’tibor bering: SELECT * FROM People umumiy malumotlarni olib keldi. Query() buyrug'i buni object ga aylantirayapti.

2] Aynan qaysidir Userni olib kelish uchun (SQL da SELECT buyruqi yordamida)

public User Get(int id)
{
    using (IDbConnection db = new SqlConnection(_connectionString))
    {
        return db.QuerySingleOrDefault<User>("SELECT * FROM People WHERE Id = @id", new { id }) ?? new User { };
    }
}

Bu yerda QuerySingleOrDefault() metodi bitta id parametrini Id ga tenglayapti.

3] Yangi User qo’shish uchun (SQL da INSERT buyruqi yordamida)

public void Create(User user)
{
    using (IDbConnection db = new SqlConnection(_connectionString))
    {
        var sqlQuery = "INSERT INTO People VALUES(@Id, @FullName, @Age, @Email)";
        db.Execute(sqlQuery, user);
    }
}

4] Malum bir Userni o’zgartirish uchun (SQL da UPDATE buyruqi yordamida)

public void Update(User user)
{
    using (IDbConnection db = new SqlConnection(_connectionString))
    {
        var sqlQuery = "UPDATE People SET FullName = @FullName, Age = @Age, Email = @Email WHERE Id = @Id";
        db.Execute(sqlQuery, user);
    }
}

5] Malum bir Userni o’chirish uchun (SQL da DELETE buyruqi yordamida)

public void Delete(int id)
{
    using (IDbConnection db = new SqlConnection(_connectionString))
    {
        var sqlQuery = "DELETE FROM People WHERE Id = @id";
        db.Execute(sqlQuery, new { id });
    }
}

6] Ma’lum bir prodsedureni chaqirish uchun (SQL da EXEC buyruqi yordamida) Eng avvalo string DateTime ni Full qilib beradigan bitta prodsedura yaratib olaman:

CREATE PROCEDURE ToFullDateTime @dateTime nvarchar(30)
AS
    DECLARE @date DATETIME;
    SET @date = CONVERT(DATETIME, @dateTime, 121)
    SELECT DATENAME(YEAR, @date) AS 'Year',        
    DATENAME(QUARTER, @date)     AS 'Quarter',     
    DATENAME(MONTH, @date)       AS 'MonthName',       
    DATENAME(DAYOFYEAR, @date)   AS 'DayOfYear',   
    DATENAME(DAY, @date)         AS 'Day',         
    DATENAME(WEEK, @date)        AS 'Week',        
    DATENAME(WEEKDAY, @date)     AS 'DayOfTheWeek',     
    DATENAME(HOUR, @date)        AS 'Hour',        
    DATENAME(MINUTE, @date)      AS 'Minute',      
    DATENAME(SECOND, @date)      AS 'Second',      
    DATENAME(MILLISECOND, @date) AS 'MilliSecond', 
    DATENAME(MICROSECOND, @date) AS 'MicroSecond', 
    DATENAME(NANOSECOND, @date)  AS 'NanoSecond',  
    DATENAME(ISO_WEEK, @date)    AS 'ISO_WEEK'

a] CommandType.Text bilan

using (IDbConnection db = new SqlConnection(_connectionString))
{
    var sqlQuery = "EXEC ToFullDateTime @dateTime";
    FullTime result = db.QuerySingleOrDefault<FullTime>(sqlQuery, new { dateTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") });
    return $"Год - {result.Year}, Четверть - {result.Quarter}, Месяц название - {result.MonthName}, День года - {result.DayOfYear}, День - {result.Day}, День недели - {result.DayOfTheWeek}, Час - {result.Hour}, Минута - {result.Minute}, Секунд - {result.Second}"; 
}

b] CommandType.StoredProcedure bilan

using (IDbConnection db = new SqlConnection(_connectionString))
{
    var prodsedure = "[ToFullDateTime]";
    var values = new { dateTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") };
    FullTime result = db.QuerySingleOrDefault<FullTime>(prodsedure, values,commandType: CommandType.StoredProcedure);
    return $"Год - {result.Year}, Четверть - {result.Quarter}, Месяц название - {result.MonthName}, День года - {result.DayOfYear}, День - {result.Day}, День недели - {result.DayOfTheWeek}, Час - {result.Hour}, Минута - {result.Minute}, Секунд - {result.Second}"; 
}

---

Demak yana bitta takrorlash qilib olamiz, boshi esingizdan chiqib ketgan bo’lsa:

a) Sql bilan bog’lanish hosil qilish

using (IDbConnection db = new SqlConnection(_connectionString))
{
	//qanaqadir kod
}

b) Sql kodlarini shunchaki yozish

SELECT * FROM People

c) Yangi model tuzish (biz qaytarayotgan malumot obyekt ko’rinishida chiroyli bo’lishi uchun)

public class Class_Nomi
{
    //Proporties
}

d) Dapper bilan ko’nikma: Agar nimanidir bazada yangilamoqchi bo’lsangiz Execute()

using (IDbConnection db = new SqlConnection(_connectionString))
{
    var sqlQuery = "INSERT INTO People VALUES(@Id, @FullName, @Age, @Email)";
    db.Execute(sqlQuery, user);
}

e) Dapper bilan ko’nikma: Agar nimanidir bazadan olmoqchi bo’lsangiz Query()

using (IDbConnection db = new SqlConnection(_connectionString))
{
    return db.Query<User>("SELECT * FROM People").ToList();
}

f) Dapper bilan ko’nikma: Agar bazadan kelayotgan malumot bir qator bo’lsa QuerySingleOrDefault()

using (IDbConnection db = new SqlConnection(_connectionString))
{
    return db.QuerySingleOrDefault<User>("SELECT * FROM People WHERE Id = @id", new { id }) ?? new User { };
}

g) Dapper bilan ko’nikma: Agar bazadan bitta prodsedureni ishlamoqchi bo’lsangiz CommandType.StoredProcedure yoki CommandType.Text bilan qilamiz.

Proyektning github dagi kodlarini https://github.com/Ruzimurod2003/dapper-mvc ga joylab qo’ydim. Agar nimanidir o’rgangan bo’lsangiz bundan juda ham xursandman.