ASP.NET中SQL Server数据库访问通用类(10)

    /// <param name="parameters">T-SQL语句或存储过程的参数数组</param>
    /// <returns>返回第一行的第一列</returns>
    public object ExecuteScalar(string sql, CommandType commandType, SqlParameter[] parameters)
    {
        object result = null;
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            using (SqlCommand command = new SqlCommand(sql, connection))
            {
                command.CommandType = commandType;
                if (parameters != null)
                {
                    foreach (SqlParameter parameter in parameters)
                    {
                        command.Parameters.Add(parameter);
                    }
                }
                connection.Open();
                result = command.ExecuteScalar();
            }

        }
        return result;
    }

    #endregion

    #region 对数据库进行增删改查操作

    /// <summary>
    /// 对数据库进行增删改查操作
    /// </summary>
    /// <param name="sql">要执行的SQL文本命令</param>
    /// <returns>返回受影响的函数</returns>
    public int ExecuteNonQuery(string sql)
    {
        return ExecuteNonQuery(sql, CommandType.Text, null);
    }

    /// <summary>
    /// 对数据库进行增删改查操作
    /// </summary>