优化 INSERT、DELETE、UPDATE SQL 服务器 table 的简单方法包括 3 个步骤中没有 Entity Framework 的图像数据类型的列 (C#)

Question

我有一个优化使用调用 SQL 查询命令从 table 获取数据的想法，包括使用 C# 的 image 数据类型的列，而没有 Entity Framework in 3步骤：

步骤 0：（默认）创建一个新的 table。这是我的 table TBUsers:

CREATE TABLE [dbo].[TBUsers]
(
    [STT] [BIGINT] IDENTITY(1,1) NOT NULL,
    [HoTen] [NVARCHAR](MAX) NOT NULL,
    [MaSo] [NVARCHAR](50) NOT NULL,
    [MatKhau] [NVARCHAR](MAX) NOT NULL,
    [KhoaLop] [NVARCHAR](MAX) NOT NULL,
    [MaTheGui] [NVARCHAR](50) NOT NULL,
    [PhanQuyen] [INT] NOT NULL,
    [ChoPhepHoatDong] [BIT] NOT NULL,
    [NguoiThem] [NVARCHAR](MAX) NOT NULL,
    [NgayThem] [DATETIME] NOT NULL,
    [SoDuKhaDung] [BIGINT] NOT NULL,
    [DangGui] [BIT] NOT NULL,
    [TruyCapLanCuoi] [DATETIME] NULL,
    [ThoiGianGuiCuoi] [DATETIME] NULL,
    [HinhAnh] [IMAGE] NULL,
    [DonGia] [BIGINT] NULL,

    CONSTRAINT [PK_TBUsers] 
        PRIMARY KEY CLUSTERED ([MaTheGui] ASC)
                    WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, 
                          IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, 
                          ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

第一步：新建一个对应上面table的class，并创建2个构造函数，Users:

    public class Users
    {
        public Users()
        { }

        public Users(object sTT, object hoTen, object maSo, object matKhau, object khoaLop, object maTheGui, object phanQuyen, object choPhepHoatDong,
            object nguoiThem, object ngayThem, object soDuKhaDung, object dangGui, object truyCapLanCuoi, object thoiGianGuiCuoi, object hinhAnh,object donGia)
        {
            STT = sTT.ToString();
            HoTen = hoTen.ToString();
            MaSo = maSo.ToString();
            MatKhau = matKhau.ToString();
            KhoaLop = khoaLop.ToString();
            MaTheGui = maTheGui.ToString();
            PhanQuyen = phanQuyen.ToString();
            ChoPhepHoatDong = choPhepHoatDong.ToString();
            NguoiThem = nguoiThem.ToString();
            NgayThem = ngayThem.ToString();
            SoDuKhaDung = soDuKhaDung.ToString();
            DangGui = dangGui.ToString();
            TruyCapLanCuoi = truyCapLanCuoi.ToString();
            ThoiGianGuiCuoi = thoiGianGuiCuoi.ToString();

            HinhAnh = hinhAnh==System.DBNull.Value?null: (byte[])hinhAnh;
            DonGia = donGia.ToString();
            Color = (bool)choPhepHoatDong;
        }

        public string STT { get; set; }
        public string HoTen { get; set; }
        public string MaSo { get; set; }
        public string MatKhau { get; set; }
        public string KhoaLop { get; set; }
        public string MaTheGui { get; set; }
        public string PhanQuyen { get; set; }
        public string ChoPhepHoatDong { get; set; }
        public string NguoiThem { get; set; }
        public string NgayThem { get; set; }
        public string SoDuKhaDung { get; set; }
        public string DangGui { get; set; }
        public string TruyCapLanCuoi { get; set; }
        public string ThoiGianGuiCuoi { get; set; }
        public byte[] HinhAnh { get; set; }
        public string DonGia { get; set; }
        public bool Color { get; set; }
    }
}

第 2 步： 使用 ParseUser 函数从数据库中获取 Users：

    public static Users ParseUser(DataRow row)
    {
        var stt = row["STT"];
        var hoTen = row["HoTen"];
        var maSo = row["MaSo"];
        var matKhau = row["MatKhau"];
        var khoaLop = row["KhoaLop"];
        var maTheGui = row["MaTheGui"];
        var phanQuyen = row["PhanQuyen"];
        var choPhepHoatDong = row["ChoPhepHoatDong"];
        var nguoiThem = row["ChoPhepHoatDong"];
        var ngayThem = row["ChoPhepHoatDong"];
        var soDuKhaDung = row["SoDuKhaDung"];
        var dangGui = row["DangGui"];
        var truyCapLanCuoi = row["TruyCapLanCuoi"];
        var guiLanCuoi = row["ThoiGianGuiCuoi"];
        var hinhAnh = row["HinhAnh"] == System.DBNull.Value ? null : row["HinhAnh"];
        var donGia = row["DonGia"];

        return new Users(stt, hoTen, maSo, matKhau, khoaLop, maTheGui, phanQuyen, choPhepHoatDong, nguoiThem, ngayThem, soDuKhaDung, dangGui,
            truyCapLanCuoi, guiLanCuoi, hinhAnh, donGia);
    }

第 3 步： 使用 ParseUser 函数轻松获取用户 class 的实例：

Users user = Table.ParseUser(sqlUtility.GetDataTable($"SELECT * FROM [dbo].[TBUsers] WHERE MaSo = 'xxx' AND ChoPhepHoatDong=1;").Rows[0]);

正在更新... 假设我有很多 table 如下，我想插入到特定的 table:

    public enum TableName
    {
        Users = 0,
        Registration,
        TheTamThoi
    }

创建一个函数来执行此操作，InsertWithImage:

        public string InsertWithImage(TableName tableName, string[] fields, string[] values)
        {
            try
            {
                Connect();
                SqlCommand command;
                SqlDataAdapter adapter;
                string commandText = string.Empty;
                string table = string.Empty;
                switch (tableName)
                {
                    case TableName.Users:
                        table = "TBUsers";
                        break;
                    case TableName.Registration:
                        table = "TBRegistration";
                        break;
                    case TableName.TheTamThoi:
                        table = "TBTheTamThoi";
                        break;
                    default:
                        break;
                }
                StringBuilder builder = new StringBuilder($"INSERT INTO [dbo].[{table}](");

                for (int i = 0; i < fields.Length; i++)
                {
                    builder.Append(i == fields.Length - 1 ? $"[{fields[i]}]) VALUES(" : $"[{fields[i]}],");
                }
                for (int i = 0; i < values.Length; i++)
                {
                    builder.Append(i != values.Length - 1 ? $"@{fields[i]}, " : $"@{fields[i]})");
                }
                commandText = builder.ToString();
                command = new SqlCommand(commandText, sqlConnection);

                for (int i = 0; i < values.Length; i++)
                {
                    if (fields[i] == "HinhAnh")
                        command.Parameters.AddWithValue(fields[i], string.IsNullOrEmpty(values[i]) ? (object)DBNull.Value : GetData(values[i])).SqlDbType = SqlDbType.Image;
                    else
                        command.Parameters.AddWithValue(fields[i], values[i]);
                }

                adapter = new SqlDataAdapter(command);
                adapter.InsertCommand = new SqlCommand(commandText, sqlConnection);
                command.ExecuteNonQuery();
                command.Dispose();
                sqlConnection.Close();
                return string.Empty;
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }

小贴士

并假设我想从数据库中的 table 中获取数据以插入到另一个数据库中：

创建一个函数来执行此操作，InsertWithImageFromDB:

        public string InsertWithImageFromDB(TableName tableName, string[] fields, object[] values)
        {
            try
            {
                Connect();
                SqlCommand command;
                SqlDataAdapter adapter;
                string commandText = string.Empty;
                string table = string.Empty;
                switch (tableName)
                {
                    case TableName.Users:
                        table = "TBUsers";
                        break;
                    case TableName.Registration:
                        table = "TBRegistration";
                        break;
                    case TableName.TheTamThoi:
                        table = "TBTheTamThoi";
                        break;
                    default:
                        break;
                }
                StringBuilder builder = new StringBuilder($"INSERT INTO [DBBaiDoXe].[dbo].[{table}](");

                for (int i = 0; i < fields.Length; i++)
                {
                    builder.Append(i == fields.Length - 1 ? $"[{fields[i]}]) VALUES(" : $"[{fields[i]}],");
                }
                for (int i = 0; i < values.Length; i++)
                {
                    builder.Append(i != values.Length - 1 ? $"@{fields[i]}, " : $"@{fields[i]})");
                }
                commandText = builder.ToString();
                command = new SqlCommand(commandText, sqlConnection);

                for (int i = 0; i < values.Length; i++)
                {
                    command.Parameters.AddWithValue(fields[i], values[i]);
                }

                adapter = new SqlDataAdapter(command);
                adapter.InsertCommand = new SqlCommand(commandText, sqlConnection);
                command.ExecuteNonQuery();
                command.Dispose();
                sqlConnection.Close();
                return string.Empty;
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }

完成。

这是一个好的解决方案吗？

我将继续编写一个简单的解决方案，以将数据插入 TBUsers table 中，其中包含图像数据类型的字段。我会 post 我以后的 post.

享受你的代码并给我一些反馈。

非常感谢！

Answer 1

假设我有很多 table 如下，我想插入到特定的 table:

    public enum TableName
    {
        Users = 0,
        Registration,
        TheTamThoi
    }

创建一个函数来执行此操作，InsertWithImage:

        public string InsertWithImage(TableName tableName, string[] fields, string[] values)
        {
            try
            {
                Connect();
                SqlCommand command;
                SqlDataAdapter adapter;
                string commandText = string.Empty;
                string table = string.Empty;
                switch (tableName)
                {
                    case TableName.Users:
                        table = "TBUsers";
                        break;
                    case TableName.Registration:
                        table = "TBRegistration";
                        break;
                    case TableName.TheTamThoi:
                        table = "TBTheTamThoi";
                        break;
                    default:
                        break;
                }
                StringBuilder builder = new StringBuilder($"INSERT INTO [dbo].[{table}](");

                for (int i = 0; i < fields.Length; i++)
                {
                    builder.Append(i == fields.Length - 1 ? $"[{fields[i]}]) VALUES(" : $"[{fields[i]}],");
                }
                for (int i = 0; i < values.Length; i++)
                {
                    builder.Append(i != values.Length - 1 ? $"@{fields[i]}, " : $"@{fields[i]})");
                }
                commandText = builder.ToString();
                command = new SqlCommand(commandText, sqlConnection);

                for (int i = 0; i < values.Length; i++)
                {
                    if (fields[i] == "HinhAnh")
                        command.Parameters.AddWithValue(fields[i], string.IsNullOrEmpty(values[i]) ? (object)DBNull.Value : GetData(values[i])).SqlDbType = SqlDbType.Image;
                    else
                        command.Parameters.AddWithValue(fields[i], values[i]);
                }

                adapter = new SqlDataAdapter(command);
                adapter.InsertCommand = new SqlCommand(commandText, sqlConnection);
                command.ExecuteNonQuery();
                command.Dispose();
                sqlConnection.Close();
                return string.Empty;
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }

完成。

Answer 2

ntext、text 和 image 数据类型将在 SQL Server 的未来版本中删除。避免在新的开发工作中使用这些数据类型，并计划修改当前使用它们的应用程序。请改用 nvarchar(max)、varchar(max) 和 varbinary(max)。只为你解决

优化 INSERT、DELETE、UPDATE SQL 服务器 table 的简单方法包括 3 个步骤中没有 Entity Framework 的图像数据类型的列 (C#)

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