Izayoi.Data

This is a database operation support library that includes a fast micro O/R mapper (ORM).

Feature

It has 9 functions.

1. DbDataMapper: This is a micro O/R mapper.
2. QueryBuilder: This helps construct the query and parameters.
3. DbCommandAdapter: The above two functions are combined to support command execution.
4. DbRepositoryBase: It provides basic CRUD operations on table.
5. DataValidator: It provides fast model validation.
6. ComparableEnum: This is a comparable enumlation.
7. ComparableNullable: This is a comparable nullable value.
8. ComparableStructPack: This is a comparable structure pack.
9. TimestampedObject: This is a timestamped object.

Documentation

Documantation

Wiki

Wiki

Available Databases

A Database with a package that implements classes that inherit from the DbCommand and DbDataReader classes.

Database	NuGet	GitHub	Project
MySQL	MySqlConnector	MySqlConnector	mysqlconnector.net
PostgreSQL	Npgsql	Npgsql	Npgsql
SQL Server	Microsoft.Data.Sqlclient	-	-
SQLite	Microsoft.Data.Sqlite	-	-

Installation

Package Name	NuGet	GitHub
Izayoi.Data.Comparable	Izayoi.Data.Comparable	Izayoi.Data
Izayoi.Data.DbCommandAdapter	Izayoi.Data.DbCommandAdapter	Izayoi.Data
Izayoi.Data.DbDataMapper	Izayoi.Data.DbDataMapper	Izayoi.Data
Izayoi.Data.Packs	Izayoi.Data.Packs	Izayoi.Data
Izayoi.Data.Query	Izayoi.Data.Query	Izayoi.Data
Izayoi.Data.Repository	Izayoi.Data.Repository	Izayoi.Data
Izayoi.Data.TimestampedObjects	Izayoi.Data.TimestampedObjects	Izayoi.Data
Izayoi.Data.Validation	Izayoi.Data.Validation	Izayoi.Data

Examples

Map classes

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

[Table("users")]
public class User
{
    [Key]
    [Column("id")]
    public int Id { get; set; }

    [Column("name")]
    public string Name { get; set; } = string.Empty;

    [Column("age")]
    public byte Age { get; set; }

    [Column("gender")]
    public GenderType Gender { get; set; }

    [Column("created_at")]
    public DateTime CreatedAt { get; set; }

    [Column("updated_at")]
    public DateTime UpdatedAt { get; set; }
}

• If the [Table] attribute is not defined, the class name is used as the table name.
• If the [Column] attribute is not defined, the property name is used as the column name.
• If the [NotMapped] attribute is defined, the property is excluded from the mapping.
• The [Key] attribute is set to the primary key. It is used for update or delete methods.

DbDataMapper

The most important method is ExecuteQueryAsync<T>.
And maybe you'll have an opportunity to use methods ReadToObjectAsync<T> and ReadToObjectsAsync<T>.

using System.Collections.Generic;
using System.Threading.Tasks;
using Izayoi.Data;
using Microsoft.Data.SqlClient;  // for SQL Server
//using Microsoft.Data.Sqlite;   // for SQLite
//using MySqlConnector;          // for MySQL
//using Npgsql;                  // for PostgreSQL

public class UserRepository
{
    private readonly string dbConnectionString;

    private readonly DbDataMapper dbDataMapper = new();

    public async Task<List<User>> GetUsers(CancellationToken cancellationToken)
    {
        using SqlConnection dbConnection = new(dbConnectionString);

        using SqlCommand dbCommand = dbConnection.CreateCommand();

        dbCommand.CommandText = "SELECT * FROM users";

        dbConnection.Open();

        // Map DB data to objects.
        List<User> users = await dbDataMapper.ExecuteQueryAsync<User>(dbCommand, cancellationToken);

        dbConnection.Close();

        return users;
    }
}

DbCommandAdapter

using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Izayoi.Data;
using Izayoi.Data.Query;
using Microsoft.Data.SqlClient;  // for SQL Server
//using Microsoft.Data.Sqlite;   // for SQLite
//using MySqlConnector;          // for MySQL
//using Npgsql;                  // for PostgreSQL

public class UserRepository
{
    private readonly string dbConnectionString;

    private readonly DbCommandAdapter dbCommandAdapter;

    private readonly DbDataMapper dbDataMapper;

    private readonly QueryOption queryOption;

    public UserRepository()
    {
        queryOption = new QueryOption(RdbKind.SqlServer);

        dbDataMapper = new DbDataMapper();

        dbCommandAdapter = new DbCommandAdapter(dbDataMapper, queryOption);
    }

    public async Task<User> AddUser(string name, byte age, GenderType gender, CancellationToken cancellationToken)
    {
        using SqlConnection dbConnection = new(dbConnectionString);

        using SqlCommand dbCommand = dbConnection.CreateCommand();

        dbConnection.Open();

        var user = new User()
        {
            Id = 0,
            Name = name,
            Age = age,
            Gender = gender,
            CreatedAt = DateTime.UtcNow,
            UpdatedAt = DateTime.UtcNow,
        };

        int userId = await dbCommandAdapter.InsertReturnAsync<int, User>(dbCommand, user, excludeKey: true, cancellationToken);

        dbConnection.Close();

        user.Id = userId;

        return user;
    }

    public async Task<List<User>> GetTeenAgers(CancellationToken cancellationToken)
    {
        // CreateConnection -> CreateCommand -> Connection.Open

        var select = new Select()
            .SetFrom("users")
            .AddField("*")
            .AddWhere("age", OpType.BETWEEN, new int[] { 13, 19 })
            .AddOrder("age", OType.ASC);

        List<User> users = await dbCommandAdapter.SelectAsync<User>(dbCommand, select, cancellationToken);

        return users;
    }
}

Unity

manifest.json

{
  "dependencies": {
    "com.izayoi.data.comparable": "1.1.0",
    "com.izayoi.data.dbcommandadapter": "1.3.0",
    "com.izayoi.data.dbdatamapper": "1.2.0",
    "com.izayoi.data.packs": "1.1.0",
    "com.izayoi.data.query": "1.3.0",
    "com.izayoi.data.repository": "1.2.0",
    "com.izayoi.data.timestampedobjects": "1.1.0",
    "com.izayoi.data.validation": "1.3.0",
    "org.nuget.microsoft.bcl.hashcode": "6.0.0",
    "org.nuget.system.componentmodel.annotations": "4.4.0"
  },
  "scopedRegistries": [
    {
      "name": "OpenUPM",
      "url": "https://package.openupm.com",
      "scopes": [
        "com.izayoi"
      ]
    }
  ]
}

or

{
  "dependencies": {
    "com.izayoi.data.comparable": "https://github.com/izayoijiichan/Izayoi.Data.git?path=Izayoi.Data.Comparable",
    "com.izayoi.data.dbcommandadapter": "https://github.com/izayoijiichan/Izayoi.Data.git?path=Izayoi.Data.DbCommandAdapter",
    "com.izayoi.data.dbdatamapper": "https://github.com/izayoijiichan/Izayoi.Data.git?path=Izayoi.Data.DbDataMapper",
    "com.izayoi.data.packs": "https://github.com/izayoijiichan/Izayoi.Data.git?path=Izayoi.Data.Packs",
    "com.izayoi.data.query": "https://github.com/izayoijiichan/Izayoi.Data.git?path=Izayoi.Data.Query",
    "com.izayoi.data.repository": "https://github.com/izayoijiichan/Izayoi.Data.git?path=Izayoi.Data.Repository",
    "com.izayoi.data.timestampedobjects": "https://github.com/izayoijiichan/Izayoi.Data.git?path=Izayoi.Data.TimestampedObjects",
    "com.izayoi.data.validation": "https://github.com/izayoijiichan/Izayoi.Data.git?path=Izayoi.Data.Validation",
    "org.nuget.microsoft.bcl.hashcode": "6.0.0",
    "org.nuget.system.componentmodel.annotations": "4.4.0"
  }
}

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Last updated: 24 November, 2025
Editor: Izayoi Jiichan

Copyright (C) 2024 Izayoi Jiichan. All Rights Reserved.