sqlconnection

问题 I am trying to get all tables from a LocalDB database in C# (VS 2012) When using an OleDbConnection I can do string[] restrictions = new string[4]; connection.GetSchema("Tables", restrictions); and it will return all user tables, all system views and all system tables How can I do this with a SqlConnection ? It seems that GetSchema on a SqlConnection only returns user tables and views, but no system tables or views. The 4th restriction parameter only seems to accept VIEW and BASE TABLE.

问题 I'm trying to select a list of users from the database and send email to each of every users based on a condition isSent == false. After send email to them, the value of this false should be update to true. Below code is the way i retrieve list of users from database and call method sendEmail() to each of them. myConnection.Open(); //******* try { SqlDataReader myReader = null; string sql = "SELECT * FROM testTable where isSent = false"; SqlCommand myCommand = new SqlCommand(sql, myConnection

问题 For background info, I'm running .NET core on Arch Linux VScode and I also have SQL Server running on Arch Linux. When I connect to the server via sqlcmd or through the VScode SQL extension, everything works fine. Only when scaffolding am I getting errors, so my connection string is probably wrong, and I've searched and basically tried everything within my grasp. Any help would be much appreciated, thanks in advance. When I run the command [wasiim@wasiim-PC WebApiServerApp]$ dotnet ef

问题 connect(); $arr = mssql_fetch_assoc(mssql_query("SELECT Applications.ProductName, Applications.ProductVersion, Applications.ProductSize, Applications.Description, Applications.ProductKey, Applications.ProductKeyID, Applications.AutomatedInstaller, Applications.AutomatedInstallerName, Applications.ISO, Applications.ISOName, Applications.Internet, Applications.InternetURL, Applications.DatePublished, Applications.LicenseID, Applications.InstallationGuide, Vendors.VendorName FROM Applications

问题 In my database table, I have a column name 'SectionDatatable' which are in XML datatype. In my C# code, after I have connection to database to my database and I make a query to get SectionDatatablewhich is XML format in my database, UserDefinedSectionData. I need to convert the 'SectionDatatable' in XML Datatype and convert it into DataSet, how can I do it. I have stuck for 1 day, the following is my code. SqlConnectionStringBuilder csb = new SqlConnectionStringBuilder(); csb.DataSource = @

问题 I have a temporal table Employee with EmployeeHistory as its history table. In C#, I am using SqlConnection to query the data from SQL Server for the entire history of an employee. var data = Conn.ExecuteReader("select * from Employee e FOR SYSTEM_TIME ALL WHERE e.Id=15"); This throws the error: Incorrect syntax near FOR So, how do we query history data for a temporal table in C# using SqlConnection ? 回答1: Problem is you are using table alias e and so the error. Don't think you can use table

问题 I have the following code try { using (var connection = new SqlConnection(Utils.ConnectionString)) { connection.Open(); using (var cmd = new SqlCommand("StoredProcedure", connection)) { cmd.CommandType = System.Data.CommandType.StoredProcedure; var sqlParam = new SqlParameter("id_document", idDocument); cmd.Parameters.Add(sqlParam); int result = cmd.ExecuteNonQuery(); if (result != -1) return "something"; //do something here return "something else"; } } //do something } catch (SqlException ex

问题 i would like to know if there's something wrong in this asp.net code: mydatareader = mycmd.executeReader() if myDataReader.HasRow then // Do something end if myConnection.Close() If i avoid to call a "MyDataReader.Close()" does the connection close anyway ? I ask this because i'm assuming that if call a "MyConn.Close" it automatically close the associated datareader... or am i wrong ? Thanks 回答1: You have to close your reader instead of closing the connection. Have a look here: http://msdn

问题 I am trying to connect to a SQL Server. I am trying to use the SqlConnection object in C#, I've tried putting a domain before my username and I've tried with and without the portnumber SqlConnection myConnection = new SqlConnection("user id=username;" + "password=xxxxx;" + "server=ipaddress:portnumber;" + "Trusted_Connection=yes;" + "database=databaseName; " + "connection timeout=30"); try { myConnection.Open(); } catch(Exception ex) { } I don't get any error message, it just hangs at

问题 This is my first post. help me. how to bind datatable to webgrid? My code: SqlConnection con = new SqlConnection(CS); SqlCommand cmd = new SqlCommand("select * from candidate", con); SqlDataAdapter da = new SqlDataAdapter(cmd); DataTable dt = new DataTable(); da.Fill(dt); return View(dt); I want to bind datatable to webgrid..help me... 回答1: This is best solution I found :) hope it can help you: SqlConnection con = new SqlConnection(CS); SqlCommand cmd = new SqlCommand("select * from candidate