I am trying to import excel file into SQL Server 2005 in C#, but I', getting an error.
Here's my code:
namespace excel
{
public partial class Csharp_Excel : Form
{
public Csharp_Excel()
{
InitializeComponent();
}
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter();
DataTable dt = new DataTable();
private void button1_Click(object sender, EventArgs e)
{
string path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
path = Path.Combine(path, "csharp-Excel.xls");
string connStr = #"Server=.\\SQLEXPRESS;Data Source= C:\\Users\\adil pc\\Documents\\Visual Studio 2008\\Projects\\excel\\excel\\bin\\Debug\\csharp-Excel.xls;Initial Catalog=RMS;Integrated Security=SSPI;";
SqlConnection con = new SqlConnection(connStr);
string strCmd = "select * from [sheet1$A1:E7]";
SqlCommand cmd = new SqlCommand(strCmd, con);
try
{
con.Open();
ds.Clear();
da.SelectCommand = cmd;
da.Fill(dt);
dataGridView1.DataSource = ds.Tables[0];
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
finally
{
}
}
private void btnsend_Click(object sender, EventArgs e)
{
}
}
The error that I am getting is:
System.Data.SqlClient.SqlException: A network-related or instance-specified error occurred while establishing a connection to SQL Server
I think I got it working I made some changes in connection string :
string connStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\\csharp-Excel.xls;Extended Properties=\"Excel 8.0;HDR=Yes;\";
it is working on demo havent implement in actual project once I do will update.
Related
using this code:
private async Task<object> ChatNotification()
{
try
{
string cs =dbConnectionStr;
using (SqlConnection con = new SqlConnection(cs))
{
con.Open();
string cmdText = #"SELECT
[dbo].[ChatMessage].[Id],
[dbo].[ChatMessage].[fkUserId],
[dbo].[ChatMessage].[fkGroupId],
[dbo].[ChatMessage].[Message],
[dbo].[ChatMessage].[DateTime],
[dbo].[ChatMessage].[IPAddress]
FROM [dbo].[ChatMessage] ";
SqlClientPermission permission =
new SqlClientPermission(
PermissionState.Unrestricted);
try
{
permission.Demand();
}
catch (System.Exception ex)
{
}
using (SqlCommand cmd = new SqlCommand(cmdText, con))
{
cmd.Notification = null;
SqlDependency tradeInfoDependency = new SqlDependency(cmd);
tradeInfoDependency.OnChange += DependencyNotify_OnChange;
if (con.State == ConnectionState.Closed)
{
con.Open();
}
SqlDataReader reader = cmd.ExecuteReader();
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
throw;
}
return Ok( );
}
//dependency******
private async void DependencyNotify_OnChange(object sender, SqlNotificationEventArgs e)
{
ChatNotification().Wait();
var dependency = sender as SqlDependency;
if (dependency == null) return;
if (e.Info == SqlNotificationInfo.Insert || e.Info == SqlNotificationInfo.Merge)
{
var chats = _dbContext.ChatMessage.FromSql(#"SELECT * FROM [dbo].[ChatMessage] " +
"WHERE IsSeenByAdmin=0").OrderBy(c => c.DateTime).ToList();
dependency.OnChange -= DependencyNotify_OnChange;
await _chatAdminHubContext.Clients.All.SendAsync("AdminListen",
chats);
}
}
public Startup(IConfiguration configuration)
{
SqlDependency.Start(dbConnectionStr);
Configuration = configuration;
}
the whole thing works with this connection string which is connected to my localdb:
private readonly string dbConnectionStr=
"Data Source=.;Initial Catalog=signalr;Integrated Security=True;user id=sa;password=******";
but it does not work if i change the connection string to this:
private readonly string dbConnectionStr=
"Data Source=server.*****.com\\MAININSTANCE;Initial Catalog=signalr;Persist Security Info=True;User ID=sa;Password=********";
i can connect to the server and local db with no problem, and can use fetching data with entityframework from both, the connection is made successfully yet the only problem is that when i insert row in localdb [dbo].[ChatMessage], dependency works but when i insert row in servers [dbo].[ChatMessage], it does not.
the only thing i did was to set broker enabled. Could it be related to any permissions on server's db?
UPDATE:
select * from sys.transmission_queue
gives this transmission_status:
An exception occurred while enqueueing a message in the target queue. Error: 15517, State: 1. Cannot execute as the database principal because the principal "dbo" does not exist, this type of principal cannot be impersonated, or you do not have permission. 5
I have an excel file. Now I need to save data of excel file in database. What is the simplest way to do that using c# with simple example? Thank in advance
This will do what you want.
private void button1_Click(object sender, EventArgs e)
{
System.Data.OleDb.OleDbConnection ExcelConnection = new System.Data.OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\your_path\\Import_List.xls;Extended Properties=Excel 8.0;");
ExcelConnection.Open();
string expr = "SELECT * FROM [Sheet1$]";
OleDbCommand objCmdSelect = new OleDbCommand(expr, ExcelConnection);
OleDbDataReader objDR = null;
SqlConnection SQLconn = new SqlConnection();
string ConnString = "Data Source=Your_Database_Name;Initial Catalog=Table_Name;Trusted_Connection=True;";
SQLconn.ConnectionString = ConnString;
SQLconn.Open();
using (SqlBulkCopy bulkCopy = new SqlBulkCopy(SQLconn))
{
bulkCopy.DestinationTableName = "tblTest";
try
{
objDR = objCmdSelect.ExecuteReader();
bulkCopy.WriteToServer(objDR);
ExcelConnection.Close();
//objDR.Close()
SQLconn.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
}
To copy from a SQL Server table to an Excel file, try the following.
using System;
using System.Drawing;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
try
{
System.Data.OleDb.OleDbConnection MyConnection ;
System.Data.OleDb.OleDbCommand myCommand = new System.Data.OleDb.OleDbCommand();
string sql = null;
MyConnection = new System.Data.OleDb.OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;Data Source='c:\\csharp.net-informations.xls';Extended Properties=Excel 8.0;");
MyConnection.Open();
myCommand.Connection = MyConnection;
sql = "Insert into [Sheet1$] (id,name) values('5','e')";
myCommand.CommandText = sql;
myCommand.ExecuteNonQuery();
MyConnection.Close();
}
catch (Exception ex)
{
MessageBox.Show (ex.ToString());
}
}
}
}
Or, with a 'Where' clause, you can have more control of the output.
using System;
using System.Drawing;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
try
{
System.Data.OleDb.OleDbConnection MyConnection ;
System.Data.OleDb.OleDbCommand myCommand = new System.Data.OleDb.OleDbCommand();
string sql = null;
MyConnection = new System.Data.OleDb.OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;Data Source='c:\\csharp.net-informations.xls';Extended Properties=Excel 8.0;");
MyConnection.Open();
myCommand.Connection = MyConnection;
sql = "Update [Sheet1$] set name = 'New Name' where id=1";
myCommand.CommandText = sql;
myCommand.ExecuteNonQuery();
MyConnection.Close();
}
catch (Exception ex)
{
MessageBox.Show (ex.ToString());
}
}
}
}
How can I attach a password protected sqlite database to a non password protected database?
I have a user sqlite database that is not password protected.
I'm trying to attach a read-only resource database that is password protected.
I could reverse their roles and open the password protected first and attach the user database, but I think it should work this way?
I haven't tried too many things so there is no code to share. but I have googled and can't seem to find any mention of this in the documentation or any examples.
It's all about opening a password protected database directly.
Edit: - heres what i've tried...
using both https://www.sqlite.org/lang_attach.html https://www.sqlite.org/c3ref/open.html
private void btnPasswordAttach_Click(object sender, EventArgs e)
{
string pathToUnProtected = #"C:\Users\BoB\Downloads\DBs\Test Users #1.astc";
string connectionstring = string.Format("Data Source={0};Version=3;BinaryGUID=false", pathToUnProtected);
SQLiteConnection connection = new SQLiteConnection(connectionstring);
connection.Open();
TestQueryMain(connection); **//WORKS**
pathToUnProtected = #"C:\Users\BoB\Downloads\DBs\Test Mods #1.aste";
string commandTextUnProtected = string.Format("ATTACH DATABASE '{0}' AS mods", pathToUnProtected);
SQLiteCommand attachCommandUnProtected = new SQLiteCommand(commandTextUnProtected, connection);
attachCommandUnProtected.ExecuteNonQuery();
TestQueryUnProtected(connection); **//WORKS**
//string pathToProtected = #"C:\Users\BoB\Downloads\DBs\VanillaResources.sqlite";
//string pathToProtected = #"C:\Users\BoB\Downloads\DBs\VanillaResources.sqlite?password=VanillaIceCream";
//string pathToProtected = #"file:C:\Users\BoB\Downloads\DBs\VanillaResources.sqlite?password=VanillaIceCream";
string pathToProtected = #"C:\Users\BoB\Downloads\DBs\VanillaResources.sqlite;password=VanillaIceCream;";
string password = "VanillaIceCream";
string commandText = string.Format("ATTACH DATABASE '{0}' AS vanilla", pathToProtected);
SQLiteCommand attachCommandProtected = new SQLiteCommand(commandText, connection);
attachCommandProtected.ExecuteNonQuery();
TestQueryProtected(connection); **//NO SUCH TABLE...**
}
private void TestQueryMain(SQLiteConnection connection)
{
string sql = "Select * FROM Notes";
SQLiteCommand command = new SQLiteCommand(sql, connection);
command.ExecuteReader();
}
private void TestQueryProtected(SQLiteConnection connection)
{
try
{
string sql = "SELECT Version from vanilla.DatabaseVersion";
SQLiteCommand command = new SQLiteCommand(sql, connection);
using (SQLiteDataReader reader = command.ExecuteReader())
{
while (reader.Read())
{
string i = reader["Version"].ToString();
Debug.Assert(true);
}
}
}
catch (Exception ex)
{
Debug.Assert(true);
}
}
private void TestQueryUnProtected(SQLiteConnection connection)
{
try
{
string sql = "SELECT Version from mods.DatabaseVersion";
SQLiteCommand command = new SQLiteCommand(sql, connection);
using (SQLiteDataReader reader = command.ExecuteReader())
{
while (reader.Read())
{
string i = reader["Version"].ToString();
Debug.Assert(true);
}
}
}
catch (Exception ex)
{
Debug.Assert(true);
}
}
found the answer in another post:
https://stackoverflow.com/a/1385690/10099912
to attach a password protected sqlite database you need to use the 'key'word:
"ATTACH DATABASE 'C:\test.sqlite' AS attachedDb KEY 'password'"
I've created a form where the manager can import an Excel file to DataGridView but I'm having trouble saving it to the database.
Reason: So when the manager imports the rota Excel file to DataGridView I want the other users to see it in a different form.
My form code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Data.OleDb;
using System.Data.SqlClient;
namespace Login
{
public partial class EmployeeRota : Form
{
string con = "Data Source=dqq5ndqef2.database.windows.net;Initial Catalog=Login;Integrated Security=False;User ID=richardjacobs97;Password=;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False";
SqlDataAdapter sda;
SqlCommandBuilder scb;
DataTable dt;
public EmployeeRota()
{
InitializeComponent();
}
private void btnSelect_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
this.textBox1.Text = openFileDialog1.FileName;
}
}
private void button1_Click(object sender, EventArgs e)
{
string PathCpnn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= " + textBox1.Text + ";Extended Properties=\"Excel 8.0;HDR=Yes;\";";
OleDbConnection conn = new OleDbConnection(PathCpnn);
OleDbDataAdapter myDataAdapter = new OleDbDataAdapter("Select * from [" + textBox2.Text + "$]", conn);
DataTable dt = new DataTable();
myDataAdapter.Fill(dt);
dataGridView1.DataSource = dt;
myDataAdapter.Update(dt);
}
private void EmployeeRota_Load(object sender, EventArgs e)
{
string connectionString = con;
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand("INSERT INTO Rota (Id, Name, Date) Values (#Id, #Name, #Date)");
cmd.CommandType = CommandType.Text;
cmd.Connection = connection;
int i = 0;
i = dataGridView1.RowCount - 1;
cmd.Parameters.AddWithValue("#Id", dataGridView1.Rows[i].Cells[0].Value);
cmd.Parameters.AddWithValue("#Name", dataGridView1.Rows[i].Cells[1].Value);
cmd.Parameters.AddWithValue("#Date", dataGridView1.Rows[i].Cells[0].Value);
dt = new DataTable();
sda.Fill(dt);
dataGridView1.DataSource = dt;
scb = new SqlCommandBuilder(sda);
sda.Update(dt);
}
}
}
}
Database: Database pic
Form: Form pic
Any suggestions why I get this error?
An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll
Additional information: Index was out of range. Must be non-negative and less than the size of the collection.
You are receiving that error because the Load function runs when the page is first opened. You should move this into a separate functions so that it can be called at select times, maybe from a button click. This is prior to any data source being applied to the
DataGridView. You need to add the following to make sure there are rows in the table.
i = dataGridView1.RowCount - 1;
if(i<0) // Meaning that the row count was 0
{
return;
}
cmd.Parameters.AddWithValue("#Id", dataGridView1.Rows[i].Cells[0].Value);
cmd.Parameters.AddWithValue("#Name", dataGridView1.Rows[i].Cells[1].Value);
cmd.Parameters.AddWithValue("#Date", dataGridView1.Rows[i].Cells[0].Value);
hello i have a sqlite database, i hhave a table called Archive inside, but using my code it is saying Finisar.SQLite.SQLite Ex ception: SQL logic er ror or missing database:
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
SQLiteConnection cn = new SQLiteConnection(#"Data Source=./database.db;Version=2;New=False;Compress=True;");
this.dataGridView1.SelectionMode =
DataGridViewSelectionMode.FullRowSelect;
SQLiteDataAdapter da = new SQLiteDataAdapter("SELECT * FROM Archive", cn);
try
{
cn.Open();
da.Fill(DT);
this.dataGridView1.DataSource = DT;
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
cn.Close();