using Sarand.Net.Standard.Base.Dbas;
using System;
using System.Collections.Generic;
using System.Data.Common;
using System.Text;

namespace Sarand.Net.Standard.Base.Dbas
{
	//=======================================================================
	/// <summary>
	/// Database information - object supplied by main application.
	/// <para>NB Application may deploy to databases with schema differences.</para>
	/// <para>Each instance of a DbDataItem must be database specific, ie. must be able to distinguish the schema in use.</para>
	/// </summary>
	public interface IDatabaseInfo
	{
		String Context { get; }
		bool TableExists(String schemaName, String tableName);
		bool ColumnExists(String schemaName, String tableName, String columnName);
		List<DbDfnColumn> GetColumnsForTable(String schemaName, String tableName);
	}

	//=======================================================================
	public interface IDbDataItem
	{
		//-------------------------------------------------------------------
		// Population.
		void PopulateFrom (DbCommand dbCommand, String tableAlias, String filter);
		void PopulateFrom (DbDataReader dbdataReader);

		//-------------------------------------------------------------------
		// Retrieve field values.
		String GetFieldString (DbDataReader dbDataReader, String name, String defaultValue);
		Boolean GetFieldBoolean (DbDataReader dbDataReader, String name, Boolean defaultValue);
		Int16 GetFieldInt16 (DbDataReader dbDataReader, String name, Int16 defaultValue);
		Byte GetFieldByte (DbDataReader dbDataReader, String name, Byte defaultValue);
		Int32 GetFieldInt32 (DbDataReader dbDataReader, String name, Int32 defaultValue);
		Int64 GetFieldInt64 (DbDataReader dbDataReader, String name, Int64 defaultValue);
		Single GetFieldSingle (DbDataReader dbDataReader, String name, Single defaultValue);
		Double GetFieldDouble (DbDataReader dbDataReader, String name, Double defaultValue);
		Decimal GetFieldDecimal(DbDataReader dbDataReader, String name, Decimal defaultValue);
		Decimal? GetFieldDecimalNullable(DbDataReader dbDataReader, String name, Decimal? defaultValue);
		DateTime GetFieldDateTime (DbDataReader dbDataReader, String name, DateTime defaultValue);

		//-------------------------------------------------------------------
		// Database updates via ODBC Command.
		bool ExecuteInsertCommand (DbCommand dbCommand);
		bool ExecuteUpdateCommand (DbCommand dbCommand);
		//bool ExecuteDeleteCommand (DbCommand dbCommand);

		//-------------------------------------------------------------------
	}

	//=======================================================================
}