VAR.DatabaseExplorer/VAR.DatabaseExplorer/Code/DataAccess/TableDA.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using VAR.DatabaseExplorer.Code.DataTransfer;

namespace VAR.DatabaseExplorer.Code.DataAccess
{
    public class TableDA
    {
        public static List<Table> GetAllTables(string connectionString)
        {
            var tables = new List<Table>();
            var cnx = new SqlConnection(connectionString);

            cnx.Open();
            DataTable dt = cnx.GetSchema("Tables");
            cnx.Close();
            dt.DefaultView.Sort = "TABLE_SCHEMA ASC, TABLE_NAME ASC, TABLE_TYPE ASC";
            dt = dt.DefaultView.ToTable();

            foreach (DataRow dr in dt.Rows)
            {
                Table table = new Table
                {
                    Schema = (string)dr["TABLE_SCHEMA"],
                    Name = (string)dr["TABLE_NAME"],
                    Type = (string)dr["TABLE_TYPE"]
                };

                tables.Add(table);
            }

            return tables;
        }

        public static List<ViewDefinition> GetViewDefinitions(string connectionString, string schema = null, string name = null)
        {
            SqlDataAdapter dataAdapter;
            var cnx = new SqlConnection(connectionString);
            cnx.Open();

            if (DatabaseDA.SupportedSqlServerVersion(cnx.ServerVersion))
            {
                dataAdapter = new SqlDataAdapter(@"
                    SELECT 
                        sn.name ViewSchema,
                        SO.name ViewName,
                        ISNULL(SM.definition, SM.definition) AS [Definition]
                    FROM sys.sql_modules SM
                    INNER JOIN sys.Objects SO ON SM.Object_id = SO.Object_id
                    INNER JOIN sys.schemas sn ON SO.schema_id = sn.schema_id
                    WHERE SO.type = 'v'
                        AND
                        (@name IS NULL OR SO.name = @name) AND
                        (@schema IS NULL OR sn.name = @schema)
                ", cnx);
                dataAdapter.SelectCommand.Parameters.AddWithValue("@Name", (object)name ?? DBNull.Value);
                dataAdapter.SelectCommand.Parameters.AddWithValue("@Schema", (object)schema ?? DBNull.Value);
            }
            else
            {
                cnx.Close();
                return null;
            }

            var dt = new DataTable();
            dataAdapter.Fill(dt);
            cnx.Close();

            var definitions = new List<ViewDefinition>();
            foreach (DataRow dr in dt.Rows)
            {
                string strViewSchema = Convert.ToString(dr["ViewSchema"]);
                string strViewName = Convert.ToString(dr["ViewName"]);
                string strDefinition = Convert.ToString(dr["Definition"]);
                strDefinition = strDefinition.Replace("\r", "").Replace("\n", "\r\n");
                definitions.Add(new ViewDefinition { ViewSchema = strViewSchema, ViewName = strViewName, Definition = strDefinition });
            }

            return definitions;
        }

        public static IEnumerable<TableRow> GetData(string connectionString, string tableFullName)
        {
            var cnx = new SqlConnection(connectionString);
            string strCmd = string.Format("SELECT * FROM {0}", tableFullName);
            var cmd = new SqlCommand(strCmd, cnx);
            cnx.Open();
            SqlDataReader reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                TableRow row = TableRowHelper.ConvertFromDataRecord(reader);
                yield return row;
            }
            cnx.Close();
        }

        public static void View_DeleteViews(string connectionString, List<Table> views)
        {
            var cnx = new SqlConnection(connectionString);
            cnx.Open();

            foreach (Table view in views)
            {
                string strCmd = string.Format("DROP VIEW [{0}].[{1}]", view.Schema, view.Name);
                var cmd = new SqlCommand(strCmd, cnx);
                cmd.ExecuteNonQuery();
            }

            cnx.Close();
        }
    }
}