There is a huge SQL table in Postgres Database. I’d like to copy the contents of it to another different database (SQL Server) using C++. I have written a single-thread application and it works fine. I decided to use multiple threads to increase the performance of reading and writing data. Here in the code below I execute the SELECT query
Tag: c#
How to terminate SQL statements when using DEFAULT value and OleDB?
Using C# and the JET OleDB driver (Microsoft.Jet.OLEDB.4.0) to connect to an old Access database (think Access 97). The following SQL statements work fine: But terminating the statement with a semi-colon (;) causes problems: Can SQL statements with DEFAULT be terminated? Answer Default values can (and probably should) be quoted using double quotes to avoid these errors, among others: Note
how to convert ulong to rowversion
reference to converting sql server rowversion to long or ulong? i can convert SQL RowVersion to ulong by code: Now, I am faced with a problem, how to convert ulong to byte [8]? I save the value of rowversion to a file, then read it and use it to make the query. the query parameter should be byte[] , not
SQL : Get the duration between start DateTime and End DateTime from Table entries
I have a SQL table which has entries of machine start and end time (DateTime) with duration of machine running. Given a start DateTime and End DateTime I want to calculate the duration for which machine was running. DB is SQL and Code is in C#. Note: THere might be some duration when the machine is not running in between
How to connect sql Database with ado.net in Asp.Net Core Mvc 5.0?
I can not find where am i missing. my code like this ; users.cs : } usersAccessLayer.cs ; appsettings.json And finally i got this error; An unhandled exception occurred while processing the request. NullReferenceException: Object reference not set to an instance of an object. Adonet_Sql.Models.users..ctor() in users.cs, line 14 Adonet_Sql.Models.users..ctor() in users.cs bla bla. Answer ConfigurationManager.ConnectionStrings[“DefaultConnection”].ConnectionString; is for .net Core
Populate a List in one entity using information stored in a different table using EF Core 5
Summary I have two tables, a Users table and a Sponsorships table. The Sponsorships table has two foreign keys to the Users table. The relationship here is that a user can be sponsored by a several different users, and a user can sponsor several different users. I want to use this information to fill a list of Sponsors for each
SQL paramaterisation in C#, using SQL declared variables
I have the following SQL query which I am sending from a C# program: DECLARE @id as int SELECT @id = max(fault_catagory_ident) FROM fault_catagory_list INSERT INTO fault_catagory_list (…
To add dropdownlist using a secondary table column values
I have to add a dropdownlist to my existing project “moviesite”, i have a primary table moviestable for adding, edit delete movies. now added a new table Genre to add movieGenre. second …
How do I query SQL for the latest record based on latest Date and Time OR Date_Time columns?
Situation: SerialNumber has duplicate rows and I need to select the latest records and get what is the Status value (either it PASS or FAIL does not matter). SerialNumber must be check based on the previous StationNumber. Example: I want to get the Status value of the latest record SerialNumber 197601234512345 in Station 2, so value StationNumber = @Station in
How can I filter records in an SQLite database against a DateTime value that was not supplied?
I have an SQLite database of TimeRecords. When a new record is created, no EndTime is provided. I want to retrieve the first record where the EndTime was not supplied and assign it to a new TimeRecord EndTime is stored as a DateTime variable. My Current Query Calling the Query I have done some research and discovered that a DateTime