[我有一个优化使用调用SQL查询命令来从表中获取数据的想法，该表使用C＃，不使用Entity Framework，通过3个步骤从具有image数据类型的列中获取数据：
Step 0 ：（默认）创建一个新表。这是我的表格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
步骤1：创建一个与上表相对应的新类，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; }
}
}
步骤2：使用Users函数从数据库中获取ParseUser：
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);
}
步骤3：使用ParseUser函数轻松获取Users类的实例：
Users user = Table.ParseUser(sqlUtility.GetDataTable($"SELECT * FROM [dbo].[TBUsers] WHERE MaSo = 'xxx' AND ChoPhepHoatDong=1;").Rows[0]);
正在更新...假设我有很多下表，并且我想插入到特定的表中：
public enum TableName
{
Users = 0,
Registration,
TheTamThoi
}
创建一个函数来做到这一点，InsertWithImage：
public string InsertWithImage(TableName tableName, string[] fields, string[] values)
{
try
{
Connect();
SqlCommand command;
SqlDataAdapter adapter;
string commandText = string.Empty;
string table = string.Empty;
switch (tableName)
{
case TableName.Users:
table = "TBUsers";
break;
case TableName.Registration:
table = "TBRegistration";
break;
case TableName.TheTamThoi:
table = "TBTheTamThoi";
break;
default:
break;
}
StringBuilder builder = new StringBuilder($"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]}, " : $"@{fields[i]})");
}
commandText = builder.ToString();
command = new SqlCommand(commandText, sqlConnection);
for (int i = 0; i < values.Length; i++)
{
if (fields[i] == "HinhAnh")
command.Parameters.AddWithValue(fields[i], string.IsNullOrEmpty(values[i]) ? (object)DBNull.Value : GetData(values[i])).SqlDbType = SqlDbType.Image;
else
command.Parameters.AddWithValue(fields[i], values[i]);
}
adapter = new SqlDataAdapter(command);
adapter.InsertCommand = new SqlCommand(commandText, sqlConnection);
command.ExecuteNonQuery();
command.Dispose();
sqlConnection.Close();
return string.Empty;
}
catch (Exception ex)
{
return ex.Message;
}
}
Tips
并且假设我想从数据库中的表中获取数据以插入到另一个表中：
创建一个函数来做到这一点，InsertWithImageFromDB：
public string InsertWithImageFromDB(TableName tableName, string[] fields, object[] values)
{
try
{
Connect();
SqlCommand command;
SqlDataAdapter adapter;
string commandText = string.Empty;
string table = string.Empty;
switch (tableName)
{
case TableName.Users:
table = "TBUsers";
break;
case TableName.Registration:
table = "TBRegistration";
break;
case TableName.TheTamThoi:
table = "TBTheTamThoi";
break;
default:
break;
}
StringBuilder builder = new StringBuilder($"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]}, " : $"@{fields[i]})");
}
commandText = builder.ToString();
command = new SqlCommand(commandText, sqlConnection);
for (int i = 0; i < values.Length; i++)
{
command.Parameters.AddWithValue(fields[i], values[i]);
}
adapter = new SqlDataAdapter(command);
adapter.InsertCommand = new SqlCommand(commandText, sqlConnection);
command.ExecuteNonQuery();
command.Dispose();
sqlConnection.Close();
return string.Empty;
}
catch (Exception ex)
{
return ex.Message;
}
}
完成。
这是一个好的解决方案吗？
我将继续写一个简单的解决方案，将图像数据类型的字段插入数据到TBUsers表中。我将在以后的帖子中发布。
享受您的代码并给我一些反馈。
非常感谢！
假设我有很多如下表，并且我想插入到特定表中：
public enum TableName
{
Users = 0,
Registration,
TheTamThoi
}
创建一个函数来做到这一点，InsertWithImage：
public string InsertWithImage(TableName tableName, string[] fields, string[] values)
{
try
{
Connect();
SqlCommand command;
SqlDataAdapter adapter;
string commandText = string.Empty;
string table = string.Empty;
switch (tableName)
{
case TableName.Users:
table = "TBUsers";
break;
case TableName.Registration:
table = "TBRegistration";
break;
case TableName.TheTamThoi:
table = "TBTheTamThoi";
break;
default:
break;
}
StringBuilder builder = new StringBuilder($"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。