Get column name from SQL Server

Question

I\'m trying to get the column names of a table I have stored in SQL Server 2008 R2.

I\'ve literally tried everything but I can\'t seem to find how to do this.

Ri

Answer 1

You can use the query below to get the column names for your table. The query below gets all the columns for a user table of a given name:

select c.name from sys.columns c
inner join sys.tables t 
on t.object_id = c.object_id
and t.name = 'Usuarios' and t.type = 'U'

---

In your code, it will look like that:

public string[] getColumnsName()
{
    List<string> listacolumnas=new List<string>();
    using (SqlConnection connection = new SqlConnection(Connection))
        using (SqlCommand command = connection.CreateCommand())
        {
            command.CommandText = "select c.name from sys.columns c inner join sys.tables t on t.object_id = c.object_id and t.name = 'Usuarios' and t.type = 'U'";
            connection.Open();
            using (var reader = command.ExecuteReader())
            {
                while (reader.Read())
                {
                    listacolumnas.Add(reader.GetString(0));
                }
            }
        }
    return listacolumnas.ToArray();
}

Answer 2

Currently, there are two ways I could think of doing this:

• In pure SQL Server SQL you can use the views defined in INFORMATION_SCHEMA.COLUMNS. There, you would need to select the row for your table, matching on the column TABLE_NAME.
• Since you are using C#, it's probably easier to obtain the names from the SqlDataReader instance that is returned by ExecuteReader. The class provides a property FieldCount, for the number of columns, and a method GetName(int), taking the column number as its argument and returning the name of the column.

Answer 3

sp_columns - http://technet.microsoft.com/en-us/library/ms176077.aspx

There are many built in stored procedures for this type of thing.

Answer 4

The original post was close to the goal, Just some small changes and you got it. Here is my solution.

   public List<string> GetColumns(string tableName)
    {
        List<string> colList = new List<string>();
        DataTable dataTable = new DataTable();


        string cmdString = String.Format("SELECT TOP 0 * FROM {0}", tableName);

        if (ConnectionManager != null)
        {
            try
            {
                using (SqlDataAdapter dataContent = new SqlDataAdapter(cmdString, ConnectionManager.ConnectionToSQL))
                {
                    dataContent.Fill(dataTable);

                    foreach (DataColumn col in dataTable.Columns)
                    {
                       colList.Add(col.ColumnName);
                    }
                }                   
            }
            catch (Exception ex)
            {
                InternalError = ex.Message;
            }
        }


        return colList;
    }

Answer 5

SELECT COLUMN_NAME
FROM   
INFORMATION_SCHEMA.COLUMNS 
WHERE   
TABLE_NAME = 'YourTable' 

Answer 6

public string[] getColumnsName()
    {
        List<string> listacolumnas=new List<string>();
        using (SqlConnection connection = new SqlConnection(Connection))
        using (SqlCommand command = connection.CreateCommand())
        {
            command.CommandText = "select column_name from information_schema.columns where table_name = 'Usuarios'";
            connection.Open(;
            using (var reader = command.ExecuteReader(CommandBehavior.KeyInfo))
            {
                reader.Read();

                var table = reader.GetSchemaTable();
                foreach (DataColumn column in table.Columns)
                {
                    listacolumnas.Add(column.ColumnName);

                }
            }
        }
        return listacolumnas.ToArray();
    }