Entity Framework. Delete all rows in table

Question

How I can quickly remove all rows in table using Entity Framework?

I am currently using:

var rows = from o in dataDb.Table
           select o;
forea         


        

Answer 1

This works for me... EF v3.1.5

context.ModelName.RemoveRange(context.ModelName.ToList());
context.SaveChanges();

Answer 2

If you wish to clear your entire database.

Because of the foreign-key constraints it matters which sequence the tables are truncated. This is a way to bruteforce this sequence.

    public static void ClearDatabase<T>() where T : DbContext, new()
    {
        using (var context = new T())
        {
            var tableNames = context.Database.SqlQuery<string>("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE' AND TABLE_NAME NOT LIKE '%Migration%'").ToList();
            foreach (var tableName in tableNames)
            {
                foreach (var t in tableNames)
                {
                    try
                    {

                        if (context.Database.ExecuteSqlCommand(string.Format("TRUNCATE TABLE [{0}]", tableName)) == 1)
                            break;

                    }
                    catch (Exception ex)
                    {

                    }
                }
            }

            context.SaveChanges();
        }
    }

usage:

ClearDatabase<ApplicationDbContext>();

remember to reinstantiate your DbContext after this.

Answer 3

In EFCore (version i am using is 3.1) you can use the following to remove all rows -

context.Database.ExecuteSqlRaw("TRUNCATE TABLE [TableName]");

Answer 4

For those that are googling this and ended up here like me, this is how you currently do it in EF5 and EF6:

context.Database.ExecuteSqlCommand("TRUNCATE TABLE [TableName]");

Assuming context is a System.Data.Entity.DbContext

Answer 5

You can do that without Foreach

dataDB.Table.RemoveRange(dataDB.Table);
dataDB.SaveChanges();

This will remove all rows

Answer 6

var list = db.Discounts.ToList().Select(x => x as Discount);
foreach (var item in list)
{
    db.Discounts.Remove(item);
}
db.SaveChanges();