I cannot save data in access 2007. I tried the following:
Add a password to my DB; didn't work
Saved the db as a 2003 file; didn't work
Here is my code:
public bool ExecuteUDI(string query)
{
Command = new OleDbCommand();
Command.Connection = Connection;
Command.CommandText = query;
Command.CommandType = System.Data.CommandType.Text;
try
{
// Open connection
Open();
if (Command.ExecuteNonQuery() != -1)
return true;
else
return false;
}
catch (Exception e)
{
mError = "ExecuteUDI - " + e.Message;
return false;
}
finally
{
// Always close connection
Close();
}
}
When I add breakpoints, I see my query looks good:
INSERT INTO DVD (Titel) VALUES ('Elegy')
I don't get any errors, but the affected rows is 0. How come? I dont understand..
Where is your mdb file located in relation to your code? I have had issues in the past that having the mdb file in the project folder will in essence create a local copy of the db in memory when the app is running, but nothing is actually written back to the mdb in the folder...
I recommend putting the mdb file outside your project's folder. That should work.
Related
i am testing my sqlite local server with c#, I have the connection and query setup without problem. I tried to copy the query to sqlite and it runs without problem. However, when I run it in my program, nothing insert into the db. Wondering what the problem is.
I have set the db build action to Content, and the copy to output directory options to copy if newer
private void insertIntoDB(string query)
{
using (System.Data.SQLite.SQLiteConnection conn = new System.Data.SQLite.SQLiteConnection("data source=.\\VHTDatabase.db"))
{
using (System.Data.SQLite.SQLiteCommand cmd = new System.Data.SQLite.SQLiteCommand(conn))
{
conn.Open();
Console.WriteLine(query);
cmd.CommandText = query;
cmd.ExecuteNonQuery();
conn.Close();
}
}
}
Try a full path to your database in your Connectionstring
Then maybe try to add the CommandText before you open the Connection.
i mean:
cmd.CommandText = query;
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
Does your database give you informations with SELECT?
Maybe you need to reconfigure the User of the Database and give him rights to write, change and delete.
If nothing helps, then you can check, if it gives you an error.
try
{
cmd.CommandText = query;
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
}
catch(Exception ex)
{
Console.WriteLine(ex);
}
I'm trying to restore a database from a bak file. I found some code on how to do it grammatically but I'm not sure what I'm doing wrong. I'm getting an error:
Error:
Restore failed for Server 'www.freegamedata.com'.
I assume because i'm remotely connected? I'm not sure. The bak file is not on the server machine. I'm trying to build a desktop application that will install my database on the users server using my file. Here is my code:
private void Restore_Database()
{
try
{
Server server = new Server(Properties.Settings.Default.SQL_Server);
string filename = "Test.bak";
string filepath = System.IO.Directory.GetCurrentDirectory() + "\\file\\" + filename;
Restore res = new Restore();
res.Database = Properties.Settings.Default.SQL_Database;
res.Action = RestoreActionType.Database;
res.Devices.AddDevice(filepath, DeviceType.File);
res.PercentCompleteNotification = 10;
res.ReplaceDatabase = true;
res.PercentComplete += new PercentCompleteEventHandler(res_PercentComplete);
res.SqlRestore(server);
}
catch(Exception ex)
{
}
}
I'm not sure if I'm going about this the correct way. I'd like to add my database with my data to the users server as a base database. Am I doing something wrong? My connection string is good so I know its not a connection issue.
I have found a workaround for those whom do not have local access. This is a bit involved so I hope I explain this correctly and it makes sense.
Also note you will need to export your data to an excel spreadsheet before you do the steps listed below.
Exporting Data
Part 1:
Backup Your DATA!
This is a pretty simple process. Open SQL Management Studio and right click on your database. Choose export data and export it as an excel spreadsheet 2007. I'm not going to give detailed steps on this part because its pretty basic and you can google it. Sorry for the inconvenience.
Part 2:
Delete your database for testing purposes but make sure you have a working backup before you delete your database.
Importing Data
Part 1:
You need to create a script that will build your database for you automatically. You can do this by logging into SQL management Studio and right click on the database and choose:
Task -> Generate scripts
you should only need the default information. However, if your like me, I excluded the users in the list. This will generate a large SQL script.
Part 2:
Next you will want to store this file in your solution/project. Make sure you right click it and choose always copy or or copy if newer. I think that's the options. Basically it just copies your file when you debug or build it. This is critical because you will need to access this file to execute the script. Next you need to make a SQL function similar to mine to execute the script:
public bool SQLScript_ExecuteSQLScript(string ScriptLocation)
{
try
{
//5 min timeout
SqlConnection SQLConn = new SqlConnection(cn + "; Connection Timeout = 300;");
string script = File.ReadAllText(ScriptLocation);
Server server = new Server(new ServerConnection(SQLConn));
server.ConnectionContext.ExecuteNonQuery(script);
return true;
}
catch (Exception ex)
{
return false;
}
}
In my code sample please note I changed my timeout to 5 minutes. In the event you have a large script you may need to adjust the timeout to make sure your script fully executes.
Congrats you have rebuilt your database.
Part 3:
Load SQL Management Studio and make sure your database has been rebuilt successfully. You should see all your tables and Stored Procs but no data. If this is true, great you can continue. If not please go back and review your script. If you have SQL comments in your script, you may need to remove them. I had to in order for my script to execute without errors.
Part 4:
Now you need to import your data from your excel spreadsheet you created earlier. If your like me, you had multipal sheets. If you have multipal sheets then you will want to make a list to loop through each item in your list to import the sheets. If not then you can ignore my code on the list. I also put mine in a background worker but you don't need to depending on the size of your data. Also note I created a separate class containing my list but you dont have to do that if you don't want too. My sheet names are Table_1, Table_2 and Table_3 your will be differently most likely.
Sample Sheet List:
public List<string> GetTestTableList()
{
try
{
List<string> testlist = new List<string>();
testlist.Add("Table_1");
testlist.Add("Table_2");
testlist.Add("Table_3");
return testlist;
}
catch (Exception ex)
{
return null;
}
}
Part 5:
Next we will import the data from excel into SQL. This is a function I made but you can modify this to meet your needs.
Function:
private bool Import_Data_Into_SQL(string filepath, string SheetName, string Database, string Schema)
{
try
{
// sql table should match your sheet name in excel
string sqltable = SheetName;
// select all data from sheet by name
string exceldataquery = "select * from [" + SheetName + "$]";
//create our connection strings - Excel 2007 - This may differ based on Excel spreadsheet used
string excelconnectionstring = #"Provider=Microsoft.ACE.OLEDB.12.0; Data Source='" + filepath + " '; Extended Properties=Excel 8.0;";
string sqlconnectionstring = Properties.Settings.Default.SQL_Connection;
//series of commands to bulk copy data from the excel file into our sql table
OleDbConnection oledbconn = new OleDbConnection(excelconnectionstring);
OleDbCommand oledbcmd = new OleDbCommand(exceldataquery, oledbconn);
oledbconn.Open();
OleDbDataReader dr = oledbcmd.ExecuteReader();
SqlBulkCopy bulkcopy = new SqlBulkCopy(sqlconnectionstring);
bulkcopy.DestinationTableName = Database + "." + Schema +"." + sqltable;
while (dr.Read())
{
bulkcopy.WriteToServer(dr);
}
dr.Close();
oledbconn.Close();
return true;
}
catch (Exception ex)
{
return false;
}
}
I hope this helps. This was my workaround solution. Originally I wanted/tried to import my data using the .bak file but as pointed out above you can only do that if the sql server is local. So I hope this work around helps those who where faced with a similar issue as me. I'm not marking this as the answer because the above post answers the question but I'm posting this in case someone else needs this workaround. Thanks
Restore file must be on server. For installation use SQL script. This can be generated by SQL Server Management Studio (including data).
Right click on database. Choose "Tasks" - "Generate scripts". On second page of wizard choose "Advanced" and find "Types of data to script". Select "Schema and data" and save script to file.
Then use this code to run script on database
string scriptText = File.ReadAllText(scriptFile, Encoding.Default);
ExecuteBatch executeBatch = new ExecuteBatch();
StringCollection commandTexts = executeBatch.GetStatements(scriptText);
using (SqlConnection sqlConnection = new SqlConnection(conn))
{
sqlConnection.InfoMessage += SqlConnection_InfoMessage;
sqlConnection.Open();
for (int i = 0; i < commandTexts.Count; i++)
{
try
{
log.InfoFormat("Executing statement {0}", i + 1);
string commandText = commandTexts[i];
using (SqlCommand sqlCommand = sqlConnection.CreateCommand())
{
log.Debug(commandText);
sqlCommand.CommandText = commandText;
sqlCommand.CommandTimeout = 300;
int r = sqlCommand.ExecuteNonQuery();
log.DebugFormat("{0} rows affected", r);
}
}
catch (Exception ex)
{
log.Warn("Executing command failed", ex);
try
{
sqlConnection.Open();
}
catch (Exception ex2)
{
log.Error("Cannot reopen connection", ex2);
}
}
}
sqlConnection.Close();
}
I am building a inventory based application that can be directly run from any pc without any installation and so i am using SQL CE.. On Start, I am checking if database is present. If Not i am creating new database as :
try
{
string conString = "Data Source='ITM.sdf';LCID=1033;Password=ABCDEF; Encrypt = TRUE;";
SqlCeEngine engine = new SqlCeEngine(conString);
engine.CreateDatabase();
return true;
}
catch (Exception e)
{
//MessageBox.Show("Database Already Present");
}
The database is created properly and i can access the database to create tables as well.. The Problem i am facing is - I am inserting and updating records in windows form on button click with code :
using (SqlCeConnection connection = new SqlCeConnection(DatabaseConnection.connectionstring))
{
connection.Open();
String Name = NameTxt.Text.ToString();
String Phone = PhoneTxt.Text.ToString();
double balance = Double.Parse(BalanceTxt.Text.ToString());
String City = CityTxt.Text.ToString();
string sqlquery = "INSERT INTO Customers (Name,Phone,Balance,City)" + "Values(#name,#phone, #bal, #city)";
SqlCeCommand cmd = new SqlCeCommand(sqlquery, connection);
cmd.Parameters.AddWithValue("#name", Name);
cmd.Parameters.AddWithValue("#phone", Phone);
cmd.Parameters.AddWithValue("#bal", balance);
cmd.Parameters.AddWithValue("#city", City);
int x = cmd.ExecuteNonQuery();
if (x > 0)
{
MessageBox.Show("Data Inserted");
}
else
{
MessageBox.Show("Error Occured. Cannot Insert the data");
}
connection.Close();
}
and Updation Code is
using (SqlCeConnection connection = new SqlCeConnection(DatabaseConnection.connectionstring))
{
connection.Open();
int idtoedit = select_id_edit;
String Name = NameEditTxt.Text.ToString();
String Phone = metroTextBox1.Text.ToString();
String City = CityEditTxt.Text.ToString();
string sqlquery = "Update Customers Set Name = #name, Phone = #phone,City = #city where Id = #id";
SqlCeCommand cmd = new SqlCeCommand(sqlquery, connection);
cmd.Parameters.AddWithValue("#name", Name);
cmd.Parameters.AddWithValue("#phone", Phone);
cmd.Parameters.AddWithValue("#id", idtoedit);
cmd.Parameters.AddWithValue("#city", City);
int x = cmd.ExecuteNonQuery();
if (x > 0)
{
MessageBox.Show("Data Updated");
}
else
{
MessageBox.Show("Error Occured. Cannot Insert the data");
}
loadIntoGrid();
connection.Close();
}
Whenever i execute code for inserting and updating records - Records are reflected in datagrid filled with adapter from database table. But once i restart the application, values do not appear in database. Once in a million, values are reflected in database. I cannot understand the reason behind this issue.
I have reffered to these articles :
C# - ExecuteNonQuery() isn't working with SQL Server CE
Insert, Update, Delete are not applied on SQL Server CE database file for Windows Mobile
But since i am creating database programmatically - It is getting created directly to bin/debug directory and i cannot see it in solution explorer in visual studio for changing copy options
You probably rewrite your database file with a blank copy from your project.
See this answer. You should not store your database in a bin folder, rather you should find a place in user's or public profile in AppData or another folder, depending on your needs.
The connection string would look like this:
<connectionStrings>
<add name="ITMContext" connectionString="data source=|DataDirectory|\ITM.sdf';LCID=1033;Password=ABCDEF; Encrypt = TRUE;" providerName="System.Data.SqlServerCe.4.0">
You shuld deploy your db file with your custom code run at app's starup to a chosen location, see this ErikEJ blog: http://erikej.blogspot.cz/2013/11/entity-framework-6-sql-server-compact-4_25.html
private const string dbFileName = "Chinook.sdf";
private static void CreateIfNotExists(string fileName)
{
string path = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
// Set the data directory to the users %AppData% folder
// So the database file will be placed in: C:\\Users\\<Username>\\AppData\\Roaming\\
AppDomain.CurrentDomain.SetData("DataDirectory", path);
// Enure that the database file is present
if (!System.IO.File.Exists(System.IO.Path.Combine(path, fileName)))
{
//Get path to our .exe, which also has a copy of the database file
var exePath = System.IO.Path.GetDirectoryName(
new Uri(System.Reflection.Assembly.GetExecutingAssembly().CodeBase).LocalPath);
//Copy the file from the .exe location to the %AppData% folder
System.IO.File.Copy(
System.IO.Path.Combine(exePath, fileName),
System.IO.Path.Combine(path, fileName));
}
}
Check also this post.
You have several options to change this behavior. If your sdf file is
part of the content of your project, this will affect how data is
persisted. Remember that when you debug, all output of your project
(including the sdf) if in the bin/debug folder.
You can decide not to include the sdf file as part of your project and manage the file location runtime.
If you are using "copy if newer", and project changes you make to the database will overwrite any runtime/debug changes.
If you are using "Do not copy", you will have to specify the location in code (as two levels above where your program is running).
If you have "Copy always", any changes made during runtime will always be overwritten
The database file in your project can be different when debugging or not. Check also this answer. You might be writting your records to another copy of the database file.
I trying to make backup and restore as a start i am trying to get backup database so write a code like this
try
{
string cbdfilename = "c:\\Bbcon.bak";
SqlConnection con = new SqlConnection("Data Source=(LocalDB)\\v11.0;AttachDbFilename=|DataDirectory|\\BbCon.mdf;Integrated Security=True;Connect Timeout=30;");
string sql = "Backup database #DBNAME to Disk = #FILENAME with Format";
SqlConnection.ClearAllPools();
SqlCommand cmd = new SqlCommand(sql, con);
cmd.Parameters.AddWithValue("#DBNAME", "BbCon");
cmd.Parameters.AddWithValue("#FILENAME", cbdfilename);
con.Open();
try
{
cmd.ExecuteNonQuery();
}
catch(Exception ex)
{
MessageBox.Show("Backup DB failed" + ex.ToString());
}
finally
{
con.Close();
con.Dispose();
}
}
catch (SqlException ex)
{
MessageBox.Show(ex.Message);
}
finally
{
if (con.State == ConnectionState.Open)
{
con.Close();
}
}
but when i run this code i get an error database BbCon not exist check your database i don't know what is problem for sure but i think i have given wrong path to database I know the path od database correctly it is like
C:\Users\Mahdi Rashidi\AppData\Local\Apps\2.0\NOL11TLW.9XG\CZM702AQ.LPP\basu..tion_939730333fb6fcc8_0001.0002_fd707bbb3c97f8d3
but this project is for some other clients so when i install this software to other computer path will change so i will get an error so i am begging you all to help finding me a better solution for creating a backup programattically
I recommend you to create an app.config file and put the backup target path there
OR
What I did some time ago (to load assemblies dynamically, but this piece of code allows u to retrieve the path location based on the assembly that you're running) it was something like:
(Don't forget to add System.Reflection to your using list)
// get the current assembly from cache
var currentAssembly = Assembly.GetEntryAssembly();
// if current assembly is null
if (currentAssembly == null)
{
// get the current assembly from stack trace
currentAssembly = new StackTrace().GetFrames().Last().GetMethod().Module.Assembly;
}
// get the assemblies path (from returned assembly)
assembliesPath = Path.GetDirectoryName(currentAssembly.Location);
From that point now you can concatenate you "Data Path" and save your data there.
Hope it helps.
I've written the below function, which errors out correctly with non-int input and with int input returns that the audit was started properly. Unfortunately when I check the table I see that the data was never actually inserted.
Any suggestions for what I'm doing wrong?
public string SqlLocation = "Data Source="+ new FileInfo(Path.GetDirectoryName(Application.ExecutablePath) + "\\DRAssistant.sdf");
public string StartAudit(string sqlLocation, string dps)
{
int dpsInteger;
if (!int.TryParse(dps, out dpsInteger))
return "DPS is not a number!";
try
{
var myConnection = new SqlCeConnection(sqlLocation);
myConnection.Open();
var myCommand = myConnection.CreateCommand();
myCommand.CommandText = string.Format("SELECT dps FROM DispatchReviews
WHERE dps = {0}", dpsInteger);
SqlCeDataReader reader = myCommand.ExecuteReader();
if (reader.Read())
{ return "DPS review has already started!"; }
myCommand.CommandText = "INSERT INTO DispatchReviews (dps, starttime,
reviewer) VALUES (#dps, #starttime, #reviewer)";
myCommand.Parameters.AddWithValue("#dps", dpsInteger);
myCommand.Parameters.AddWithValue("#starttime", DateTime.Now);
myCommand.Parameters.AddWithValue("#reviewer", Environment.UserName);
myCommand.Prepare();
myCommand.ExecuteNonQuery();
myCommand.Dispose();
myConnection.Close();
return "Dispatch Review Started!";
}
catch(Exception ex)
{ return "Unable to save DPS!" + ex.Message; }
}
Edit: Turns out this was just an idiot problem--which anybody looking at the SqlLocation could probably figure out--in that every time I built the application a new copy of the .sdf was copied into the application directory, overwriting the previous one. Also, the database I was checking for updates was not the one in the execution directory, but the one that was being copied into it, which is why it was always empty. I noticed this because when I tried to add the same DPS multiple times the first time I would get the DPS review started message, but subsequent attempts would give the error that it had previously been created.
Can you please show us your connection string??
Most likely, if you test this inside Visual Studio, the database file is being copied around (from your initial directory to the output directory where the app runs) and your INSERT will probably work just fine - but you're just looking at the wrong file when you check that fact.