using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using FirebirdSql.Data.FirebirdClient;
using FireBirdUtil.SqlUtils;

namespace FireBirdUtil.SqlHelpers
{
	public class UpdateHelper
	{
		private string _Database;
		private FbConnection _Connection;
		private FbTransaction _Transaction;

		/// <summary>
		/// 用于直接更新数据
		/// </summary>
		public UpdateHelper(string database)//用于直接更新数据
		{
#if DEBUG
			if (string.IsNullOrEmpty(database))
				throw new ArgumentException("构造函数参数不允许为空");
#endif
			_Database = database;
		}

		/// <summary>
		/// 既可用于在事务中，更新数据，也可用于直接更新数据.之所以加上database参数，是为了直接更新数据时使用
		/// </summary>
		public UpdateHelper(string database, FbConnection connection, FbTransaction transaction)//既可用于在事务中，更新数据，也可用于直接更新数据.之所以加上database参数，是为了直接更新数据时使用
			: this(database)
		{
#if DEBUG
			if (connection == null || transaction == null)
				throw new ArgumentException("构造函数的参数不允许为空");
#endif
			_Connection = connection;
			_Transaction = transaction;
		}

		public void Update(string tableName, Dictionary<string, object> newValues, string conditions)
		{
			if (_Connection == null || _Transaction == null)
				SQLExecuteUtil.Update(_Database, tableName, newValues, conditions);
			else
				SQLExecuteUtil_Transaction.Update(_Connection, _Transaction, tableName, newValues, conditions);
		}
	}
}